c/EPA
 *-jrt  tes     Office of Acid Deposition, Environmental  EPA/600/3-86/054b
    ntal Protection Monitoring and Quality Assurance    January 1987
         Washington DC 20460
Research and Development

Western Lake Survey

Phase I
           Characteristics of
           Lakes in the Western
           United States: Volume

           Data Compendium for
           Selected Physical and
           Chemical Variables

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                                                         EPA-600/3-86/054b
                                                                January 1987
                         Western Lake Survey
                               Phase I
           Characteristics of Lakes in the Western United States

 Volume II. Data Compendium for Selected Physical and Chemical Variables

                                 By:

J.M. Eilers, P. Kanciruk, R.A. McCord, W.S. Overton, L. Hook, D.J. Blick,
D.F. Brakke, P.E. Kellar, M.S. DeHaan, M.E. Silverstein, and D.H. Landers
                        A Contribution to the
            National Acid Precipitation Assessment Program
                U. S. Environmental Protection Agency
     Office of Research and Development, Washington, D. C. 20460
      Environmental Research Laboratory, Corvallis, Oregon  97333
Environmental Monitoring Systems Laboratory, Las Vegas, Nevada  89109
                                             J,;i  .'nvironmental Protection Agencr
                                             >\v   :, 5, Library (5PL-16)
                                             <;.'.0 : . L'earborn St-eet, Room 1670
                                             Chjcd.30, 1L    60604

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                                      NOTICE

    The information in  this document  has  been funded wholly or in part by the U. S.
Environmental Protection Agency under Contract No. 68-03-3249 to Lockheed Engineering and
Management Services Company, Inc., Nos. 68-01-7288 and 68-02-3994 to Radian Corporation, No.
68-03-3246 to Northrop Services, Inc., and Interagency Agreement No. 40-1441-84 with the U. S.
Department of Energy. It has been subject to the Agency's peer and administrative review, and
it has been approved for publication as an EPA document.
    Mention of corporation names, trade names or commercial products does not constitute
endorsement or recommendation for use.
    Proper citation of this  document is as follows:
Landers, D.H.1, J.M. Eilers2, D.F. Brakke3, W.S. Overton4, P.E. Kellar5, M.E. Silverstein6, R.D.
    Schonbrod7, R.E. Crowe7, R.A. Linthurst8, J.M. Omernik1,S.A. Teague2, andE.P. Meier7.
     1987.  Characteristics  of Lakes in the Western United  States.  Volume I.  Population
    Descriptions and Physico-Chemical Relationships. EPA-600/3-86/054a, U.S. Environmental
    Protection Agency, Washington, D.C.  176 pp.
Eilers, J.M., P. Kanciruk9, R.A. McCord10, W.S. Overton, L. Hook10, D.J. Blick2, D.F. Brakke,
    P.E. Kellar, M.S. DeHaan2, M.E. Silverstein, and D.H. Landers.  1987. Characteristics of
    Lakes in the Western United States.  Volume II. Data Compendium for Selected Physical
    and Chemical Variables. EPA-600/3-86/054b, U.S. Environmental Protection Agency,
    Washington, D. C. 425 pp.
     Inquiries  regarding the availability of the Western Lake Survey - Phase I data base should
be directed in writing to: Chief, Air Branch, U.S. EPA Environmental Research Laboratory, 200
S.W. 35th Street, Corvallis,  Oregon  97333.
              , Environmental Research Laboratory, 200 S.W. 35th Street, Corvallis, Oregon 97333.
      2Northrop Services, Inc., 200 S.W. 35th Street,  Corvallis, Oregon 97333.
      ^Western Washington University, Institute for Watershed Studies, Environmental Studies
       Building, Room 604, Bellingham, Washington  98225.
      4Oregon State University, Department of Statistics, Kidder Hall No, 8, Corvallis, Oregon 97331.
      5Radian Corporation, 3200 E. Chapel Hill Road, Research Triangle Park, North Carolina
       27709.
      "Lockheed Engineering and Management Services Company, Inc., 1050 E. Flamingo Road,
       Suite 120, Las Vegas, Nevada 89119.
      7USEPA, Environmental Monitoring Systems Laboratory, 944 E. Harmon Avenue, Las
       Vegas, Nevada 89193.
      8USEPA Office of Research and Development, 401 M Street, S.W., Washington, DC 20460.
       Present address: Environmental Monitoring Systems Laboratory, Mail-Drop 39, Research
       Triangle Park, North Carolina 27711.
     ^Environmental Sciences Division, Oak Ridge National Laboratory, Post Office Box X, Oak
       Ridge, Tennessee 37831.  Operated by Martin Marietta Energy Systems, Inc., under
       Contract No. DE-AC05-84OR21400 for the U.S. Department of Energy.
     ^Science Applications International Corporation, 800 Oak Ridge Turnpike, Oak Ridge,
       Tennessee 37831.

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                                      PREFACE

     The National Surface Water Survey (NSWS) was begun in 1983 by the U. S. Environmental
Protection Agency (EPA) under the National Acid Precipitation Assessment Program, a Federal
Interagency Task Force mandated by Congress in 1980.  The goals of the  NSWS are to: (1)
determine the present chemical conditions in surface waters in regions of  the United States
considered potentially sensitive to the effects of acidic deposition, (2) evaluate the  temporal
variability  of chemistry and quantify biological status of these waters, and (3) develop and
implement a project to monitor changes over time in representative systems.  The NSWS is one
of several major projects in EPA's Acid Deposition Aquatic Effects Research Program.  This
program, one of many research programs investigating acidic deposition, is administered in the
Acid Deposition and Atmospheric Research Division: Office of Acid Deposition, Environmental
Monitoring and Quality Assurance in the U.S. EPA Office of Research and Development.
     The Aquatic Effects Research Program addresses four primary assessment questions:
     1.  How extensive is the  damage to aquatic resources as a result of current  levels  of
        acidic deposition?

     2.  What is the anticipated extent and rate of change  to these resources in the future?
     3.  What levels of damage to sensitive surface waters are associated with various rates of
        acidic deposition?
     4.  What is the rate of change or recovery of affected systems, given decreases in acidic
        deposition rates?
     Five major research projects within  the Aquatic Effects Research Program specifically
address these assessment questions from a regionalized perspective.  These projects  and  their
goals are:
     1.  National  Surface Water Survey (NSWS):    to  determine  the  present  chemistry,
        characterize the chemical temporal variability, and  determine the key biological
        resources of lakes and streams in potentially sensitive regions of the United  States;
     2.  Direct/Delayed Response Project (DDRP): to predict changes in these aquatic resources
        at various levels of acidic deposition, considering the terrestrial and aquatic variables
        that influence these changes;

     3.  Watershed Manipulation Project (WMP): to verify that predictions of future change are
        reasonably sound by manipulating watershed catchments or system components;
                                         i i i

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     4.  Episodic Response Project (ERP): to evaluate the regional importance of short-term
        acidification resulting from episodic hydrologic events and its effect on the quality of
        the biological environment; and

     5.  Long-Term Monitoring Project (LTMP):  to test the validity of predicted changes
        through long-term monitoring of regionally  characteristic lakes and streams.

     The NSWS, including surveys of lakes and of streams,  addresses the first goal of the
Aquatic Effects Research Program. Understanding the national-scale effects of acidic deposition
on aquatic resources requires that the present chemical status of surface waters be understood
on large geographical scales.  The  Western  Lake Survey  - Phase  I (WLS-I) was designed to
describe statistically the present surface water chemistry on a  regional scale in the  western
United States. Although a cause-and-effect relationship between acidic deposition and surface
water quality cannot be determined on the basis of the WLS-I data alone, continued analysis of
these data will contribute significantly to furthering our understanding of the extent to which
western lakes are at risk due to acidic deposition. Determining the relationships between acidic
deposition and surface water chemistry and biology is the goal of future activities within the
Aquatic Effects Research Program.
                                           IV

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                                        VOLUME II
                                        CONTENTS

   Notice	ii
   Preface	iii
   Related Documents	vi
   Figures	vii
   Tables.	xxv
1.  Introduction	1
2.  Population Estimates for Selected Physical and Chemical Variables	5
     2.1  Applications of the Design	5
         2.1.1  Extrapolation from Sample to Population	5
         2.1.2 Estimating the Target Population Size and Subpopulation	5
     2.2  Data Presentation	8
3.  USGS Maps Used to Define and Characterize the Lake Population	190
     3.1  Small-scale Maps	190
     3.2  Large-scale Maps	190
4.  Maps Showing Lake Locations by State	210
5.  Lakes Sampled and Individual Lake Data	221
     5.1  Probability Sample Lakes	221
         5.1.1  List of Probability Sample Lakes Sorted by State and Lake Name	221
         5.1.2 List of Probability Sample Lakes Sorted by Lake ID	222
         5.1.3 Data for Individual Probability Sample Lakes	222
     5.2  Special Interest Lakes	223
         5.2.1  List of Special Interest Lakes Sorted by State and Lake Name	223
         5.2.2 List of Special Interest Lakes Sorted by ID	223
         5.2.3 Data for Individual Special Interest Lakes	223
6.  References	424

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                                     FIGURES

1-1.     Subregions and alkalinity map classes, Western Lake Survey - Phase I.           3

2-1.     Population estimates for aluminum, extractable (ALEX 11) in clearwater lakes,
        region 4, Western Lake Survey - Phase I.                                    15

2-2.     Population estimates for aluminum, extractable (ALEX11) in clearwater lakes,
        subregion 4A, Western  Lake Survey - Phase I.                              16

2-3.     Population estimates for aluminum, extractable (ALEX 11) in clearwater lakes,
        subregion 4B, Western Lake Survey - Phase I.                                17

2-4.     Population estimates for aluminum, extractable (ALEX 11) in clearwater lakes,
        subregion 4C, Western Lake Survey - Phase  I.                               18

2-5.     Population estimates for aluminum, extractable (ALEX11) in clearwater lakes,
        subregion 4D, Western Lake Survey - Phase  I.                               19

2-6.     Population estimates for aluminum, extractable (ALEX 11) in clearwater lakes,
        subregion 4E, Western Lake Survey - Phase  I.                               20

2-6a.   Population estimates for  aluminum, total (ALTL11) in clearwater lakes,
        subregion 4A, Western Lake Survey - Phase  I.                               21

2-6b.   Population estimates for  aluminum, total (ALTL11) in clearwater lakes,
        subregion 4A, Western Lake Survey - Phase  I.                               22

2-6c.   Population estimates for  aluminum, total (ALTL11) in clearwater lakes,
        subregion 4B, Western Lake Survey - Phase I.                                23

2-6d.   Population estimates for  aluminum, total (ALTL11) in clearwater lakes,
        subregion 4C, Western Lake Survey - Phase  I.                               24

2-6e.   Population  estimates for  aluminum, total (ALTL11) in clearwater lakes,
        subregion 4D, Western Lake Survey - Phase  I.                               25
                                         vi

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2-6f.    Population  estimates for aluminum, total (ALTL11) in clearwater  lakes,
        subregion 4E, Western Lake Survey - Phase I.                                26

2-7.    Population  estimates for acid neutralizing capacity (ALKA11), region 4,
        Western Lake Survey - Phase I.                                              27

2-8.    Population estimates for acid neutralizing capacity (ALKA11), subregion 4A,
        Western Lake Survey - Phase I.                                              28

2-9.    Population estimates for acid neutralizing capacity (ALKA11), subregion 4B,
        Western Lake Survey - Phase I.                                              29

2-10.   Population estimates for acid neutralizing capacity (ALKA11) subregion 4C,
        Western Lake Survey - Phase I.                                              30

2-11.   Population estimates for acid neutralizing capacity (ALKA 11), subregion 4D,
        Western Lake Survey - Phase I.                                              31

2-12.   Population estimates for acid neutralizing capacity (ALKA 11), subregion 4,
        Western Lake Survey - Phase I.                                              32

2-13.   Population estimates for ammonium (NH416), region 4, Western Lake Survey -
        Phase I.                                                                   33

2-14.   Population  estimates for ammonium (NH416), subregion 4A, Western Lake
        Survey - Phase I.                                                          34

2-15.   Population  estimates for ammonium (NH416), subregion 4B, Western Lake
        Survey - Phase I.                                                          35

2-16.   Population estimates for ammonium (NH416), subregion 4C, Western Lake
        Survey - Phase I.                                                          36

2-17.   Population estimates for ammonium (NH416), subregion 4D, Western Lake
        Survey - Phase I.                                                          37
                                         VII

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2-18.   Population estimates for ammonium (NH416), subregion 4, Western Lake
        Survey - Phase I.                                                          38

2-19.   Population estimates for area, lake (LAKE_SIZ), region 4, Western Lake
        Survey - Phase I.                                                          39

2-20.   Population estimates for area, lake (LAKE_SIZ), subregion 4A, Western Lake
        Survey - Phase I.                                                          40

2-21.   Population estimates for area, lake (LAKE_SIZ), subregion 4B, Western Lake
        Survey - Phase I.                                                          41

2-22.   Population estimates for area, lake (LAKE_SIZ), subregion 4C, Western Lake
        Survey - Phase I-.                                                          42

2-23.   Population estimates for area, lake (LAKE_SIZ), subregion 4D, Western Lake
        Survey - Phase I.                                                          43

2-24.   Population estimates for area, lake (LAKE_SIZ), subregion 4E, Western Lake
        Survey - Phase I.                                                          44

2-2S.   Population estimates for calcium, (CA16), region 4, Western Lake Survey -
        Phase I.                                                                  45

2-26.   Population estimates for calcium, (CA16), subregion 4A, Western Lake Survey
        - Phase I.                                                                46

2-27.   Population estimates for calcium, (CA 16), subregion 4B, Western Lake Survey -
        Phase I.                                                                  47

2-28.   Population estimates for calcium, (CAI6), subregion 4C, Western Lake Survey
        - Phase I.                                                                48

2-29.   Population estimates for calcium (CA 16), subregion 4D, Western Lake Survey -
        Phase I.                                                                  49
                                        vm

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2-30.   Population estimates for calcium, (CA16), subregion 4E, Western Lake Survey
        - Phase I.                                                                 50

2-30a.  Population estimates for chloride, (CL16), region 4, Western Lake Survey -
        Phase I.                                                                   51

2-30b.  Population estimates for chloride, (CL16), subregion 4A, Western Lake Survey
        - Phase I.                                                                 52

2-30c.  Population estimates for chloride, (CL 16), subregion 4B, Western Lake Survey
        - Phase I.                                                                 53

2-30d.  Population estimates for chloride, (CL 16), subregion 4C, Western Lake Survey
        - Phase I.                                                                 54

2-30e.  Population estimates for chloride, (CL16), subregion 4D, Western Lake Survey
        - Phase I.                                                                 55

2-30f.  Population estimates for chloride, (CL 16), subregion 4, Western Lake Survey
        - Phase I.                                                                 56

2-31.   Population estimates for color, true (COLVAL) for region 4, Western Lake
        Survey - Phase I.                                                          57

2-32.   Population estimates for color, true (COLVAL) for region 4A, Western Lake
        Survey - Phase I.                                                          58

2-33.   Population estimates for color, true (COLVAL) subregion 4B, Western Lake
        Survey - Phase I.                                                          59

2-34.   Population estimates for color, true (COLVAL) subregion 4C, Western Lake
        Survey - Phase I.                                                          60

2-35.   Population estimates for color, true (COLVAL) subregion 4D, Western Lake
        Survey - Phase I.                                                          61

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2-36.    Population estimates for color, true (COLVAL) subregion 4E, Western Lake
        Survey - Phase I.                                                         62

2-37.    Population estimates for conductance (CONDI 1) region 4, Western Lake Survey
        - Phase I.                                                                63

2-38.    Population estimates for conductance (CONDI 1) subregion 4A, Western Lake
        Survey - Phase I.                                                         64

2-39.    Population estimates for conductance (CONDI 1) subregion 4B, Western Lake
        Survey - Phase I.                                                         65

2-40.    Population estimates for conductance (CONDI 1) subregion 4C, Western Lake
        Survey - Phase I.                                                         66

2-41.    Population estimates for conductance (COND11) subregion 4D, Western Lake
        Survey - Phase I.                                                         67

2-42.    Population estimates for conductance (CONDI 1) subregion 4E, Western Lake
        Survey - Phase I.                                                         68

2-43.    Population estimates for depth, site (SITDPM) region 4, Western Lake Survey
        - Phase I.                                                                69

2-44.    Population estimates for depth, site (SITDPM) region 4A, Western Lake Survey
        - Phase I.                                                                70

2-4S.    Population estimates for depth, site (SITDPM) region 4B, Western Lake Survey
        - Phase I.                                                                71

2-46.    Population estimates for depth, site (SITDPM) subregion 4C, Western Lake
        Survey - Phase I.                                                        72

2-47.   Population estimates for depth, site (SITDPM) subregion 4D, Western Lake
        Survey - Phase I.                                                         73

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2-48.   Population estimates for depth, site (SITDPM) subregion 4E, Western Lake
        Survey - Phase I.                                                          74

2-49.   Population estimates  for dissolved  inorganic carbon (DICVAL), region 4,
        Western Lake Survey - Phase I.                                             75

2-50.   Population estimates for dissolved inorganic carbon (DICVAL), subregion 4A,
        Western Lake Survey - Phase I.                                             76

2-51.   Population estimates for dissolved inorganic carbon (DICVAL), subregion 4B,
        Western Lake Survey - Phase I.                                             77

2-52.   Population estimates for dissolved inorganic carbon (DICVAL), subregion 4C,
        Western Lake Survey - Phase I.                                             78

2-53.   Population estimates for dissolved inorganic carbon (DICVAL), subregion 4D,
        Western Lake Survey - Phase I.                                             79

2-54.   Population estimates for dissolved inorganic carbon (DICVAL) subregion 4E,
        Western Lake Survey - Phase I.                                             80

2-55.   Population estimates for dissolved organic carbon (DOC11), region 4, Western
        Lake Survey - Phase I.                                                     81

2-56.   Population estimates for dissolved organic carbon (DOC 11), subregion 4A,
        Western Lake Survey - Phase I.                                             82

2-57.   Population estimates for dissolved organic carbon (DOC 11), subregion 4B,
        Western Lake Survey - Phase I.                                             83

2-58.   Population estimates for dissolved organic carbon (DOC 11), subregion 4C,
        Western Lake Survey - Phase I.                                             84

2-59.   Population estimates for dissolved organic carbon (DOC 11), subregion 4D,
        Western Lake Survey - Phase I.                                             85
                                          XI

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2-60.   Population estimates for dissolved organic carbon (DOC 11), subregion 4,
        Western Lake Survey - Phase I.                                              86

2-61.   Population estimates for dissolved organic carbon (DOC 11), region 4, Western
        Lake Survey - Phase I.                                                      87

2-62.   Population estimates for dissolved organic carbon (DOC 11), subregion 4A,
        Western Lake Survey - ,Phase I.                                              88

2-63.   Population estimates for dissolved organic carbon (DOC 11), subregion 4B,
        Western Lake Survey - Phase I.                                              89

2-64.   Population estimates for dissolved organic carbon (DOC 11), subregion 4C,
        Western Lake Survey - Phase I.                                              90

2-65.   Population estimates for dissolved organic carbon (DOC 11), subregion 4D,
        Western Lake Survey - Phase I.                                              91

2-66.   Population estimates for dissolved organic carbon (DOC 11), subregion 4E,
        Western Lake Survey - Phase I.                                              92

2-67.   Population estimates for elevation, lake (ELEV),  region 4, Western Lake
        Survey -  Phase I.                                                          93

2-68.   Population estimates for elevation, lake (ELEV), subregion 4A, Western Lake
        Survey - Phase I.                                                           94

2-69.   Population estimates for elevation, lake (ELEV), subregion 4B, Western Lake
        Survey - Phase I.                                                           95

2-70.   Population estimates for elevation, lake (ELEV), subregion 4C, Western Lake
        Survey - Phase I.                                                           96

2-71.   Population estimates for elevation, lake (ELEV), subregion 4D, Western Lake
        Survey - Phase I.                                                           97
                                         Xll

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2-72.   Population estimates for elevation, lake (ELEV), subregion 4E, Western Lake
        Survey - Phase I.                                                          98

2-73.   Population estimates for fluoride (FTL16), region 4, Western Lake Survey -
        Phase I.                                                                   99

2-74.   Population estimates for fluoride (FTL16), subregion 4A, Western Lake Survey
        - Phase I.                                                                 100

2-75.   Population estimates for fluoride (FTL 16), subregion 4B, Western Lake Survey
        - Phase I.                                                                 101

2-76.   Population estimates for fluoride (FTL 16), subregion 4C, Western Lake Survey
        - Phase I.                                                                 102

2-77.   Population estimates for fluoride (FTL 16), subregion 4D, Western Lake Survey
        - Phase I.                                                                 103

2-78.   Population estimates for fluoride (FTL 16), subregion 4E, Western Lake Survey
        - Phase I.                                                                 104

2-79.   Population estimates for iron (FEU), region 4, Western Lake Survey -
        Phase I.                                                                   105

2-80.   Population estimates for iron (FE11), subregion 4A, Western Lake Survey -
        Phase I.                                                                   106

2-81.   Population estimates for iron (FE11), subregion 4B, Western Lake Survey -
        Phase I.                                                                   107

2-82.   Population estimates for iron (FE11), subregion 4C, Western Lake Survey -
        Phase I.                                                                   108

2-83.   Population estimates for iron (FE11), subregion 4D, Western Lake Survey -
        Phase I.                                                                   109
                                        xm

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2-84.   Population estimates for iron (FE11), subregion 4E, Western Lake Survey -
        Phase I.                                                                  110

2-85.   Population estimates for magnesium (MG16), region 4, Western Lake Survey -
        Phase I.                                                                  Ill

2-86.   Population estimates for magnesium (MG16), subregion 4A, Western Lake
        Survey - Phase I.                                                         112

2-87.   Population estimates for magnesium (MG16), subregion 4B, Western Lake
        Survey - Phase I.                                                         113

2-88.   Population estimates for magnesium (MG16), subregion 4C, Western Lake
        Survey - Phase I.                                                         114

2-89.   Population estimates for magnesium (MG16), subregion 4D, Western Lake
        Survey - Phase I.                                                         115

2-90.   Population estimates for magnesium (MG16), subregion 4E, Western Lake
        Survey - Phase I.                                                         116

2-91.   Population estimates for manganese (MN11), region 4, Western Lake Survey -
        Phase I.                                                                  117

2-92.   Population estimates for manganese (MN11), subregion  4A, Western Lake
        Survey - Phase I.                                                         118

2-93.   Population estimates for manganese (MN11), subregion 4B, Western Lake
        Survey - Phase I.                                                         119

2-94.   Population estimates for manganese (MN11), subregion 4C, Western Lake
        Survey - Phase I.                                                         120

2-95.   Population estimates for manganese (MN11), subregion 4D, Western Lake
        Survey - Phase I.                                                         121
                                         xiv

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2-96.   Population estimates for manganese (MN11), subregion 4E, Western Lake
        Survey - Phase I.                                                         122

2-97.   Population estimates for nitrate (NO316), region 4, Western Lake Survey -
        Phase I.                                                                  123

2-98.   Population estimates for nitrate (NO316), subregion 4A, Western Lake Survey
        - Phase I.                                                                124

2-99.   Population estimates for nitrate (NO316), subregion 48, Western Lake Survey -
        Phase I.                                                                  125

2-100.  Population estimates for nitrate (NO316), subregion 4C, Western Lake Survey
        - Phase I.                                                                126

2-101.  Population estimates for nitrate (NO316), subregion 4D, Western Lake Survey
        - Phase I.                                                                127

2-102.  Population estimates for nitrate (NO316), subregion 4E, Western Lake Survey -
        Phase I.                                                                  128

2-103.  Population estimates for pH (PHSTVL), region 4, Western Lake Survey -
        Phase I.                                                                  129

2-104.  Population estimates for pH (PHSTVL), subregion 4A, Western Lake Survey -
        Phase I.                                                                  130

2-105.  Population estimates for pH (PHSTVL), subregion 4B, Western Lake Survey -
        Phase I.                                                                  131

2-106.  Population estimates for pH (PHSTVL), subregion 4C, Western Lake Survey -
        Phase I.                                                                  132

2-107.  Population estimates for pH (PHSTVL), subregion 4D, Western Lake Survey -
        Phase I.                                                                  133
                                         xv

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2-108.  Population estimates for pH (PHSTVL), subregion 4E, Western Lake Survey -
        Phase I.                                                                   134

2-109.  Population estimates for phosphorus (PTL11), region 4, Western Lake Survey -
        Phase I.                                                                   135

2-110.  Population estimates for phosphorus (PTL 11), subregion 4A, Western Lake
        Survey - Phase I.                                                          136

2-111.  Population estimates for phosphorus (PTL 11), subregion 4B, Western Lake
        Survey - Phase I.                                                          137

2-112.  Population estimates for phosphorus (PTL 11), subregion 4C, Western Lake
        Survey - Phase I.                                                          138

2-113.  Population estimates for phosphorus (PTL 11), subregion 4D, Western Lake
        Survey - Phase I.                                                          139

2-114.  Population estimates for phosphorus (PTL 11), subregion 4E, Western Lake
        Survey - Phase I.                                                          140

2-115.  Population estimates for potassium (K16), region 4, Western Lake Survey -
        Phase I.                                                                   141

2-116.  Population estimates for potassium (K16), subregion 4A, Western Lake Survey
        - Phase I.                                                                 142

2-117.  Population estimates for potassium (K 16), subregion 4B, Western Lake Survey
        - Phase I.                                                                 143

2-118.  Population estimates for potassium (K16), subregion 4C, Western Lake Survey
        - Phase I.                                                                 144

2-119.  Population estimates for potassium (K 16), subregion 4D, Western Lake Survey
        - Phase I.                                                                 145
                                          xvi

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2-120.  Population estimates for potassium (K16), subregion 4E, Western Lake Survey
        - Phase I.                                                                 146

2-121.  Population estimates for  secchi disk  transparency (SECMEAN), region 4,
        Western   Lake Survey -  Phase I.                                           147

2-122.  Population estimates for secchi disk transparency (SECMEAN), subregion 4A,
        Western Lake Survey - Phase I.                                             148

2-123.  Population estimates for secchi disk transparency (SECMEAN), subregion 4B,
        Western Lake Survey - Phase I.                                             149

2-124.  Population estimates for secchi disk transparency (SECMEAN), subregion 4C,
        Western Lake Survey - Phase I.                                             150

2-125.  Population estimates for secchi disk transparency (SECMEAN), subregion 4D,
        Western Lake Survey - Phase I.                                             151

2-126.  Population estimates for secchi disk transparency (SECMEAN), subregion 4E,
        Western Lake Survey - Phase I.                                             152

2-127.  Population estimates for  silica (SIO211), region  4, Western Lake Survey -
        Phase I.                                                                   153

2-128.  Population estimates for silica (SIO211), subregion 4A, Western Lake Survey -
        Phase I.                                                                   154

2-129.  Population estimates for silica (SIO211), subregion 4B, Western Lake Survey -
        Phase I.                                                                   155

2-130.  Population estimates for silica (SIO211), subregion 4C, Western Lake Survey -
        Phase I.                                                                   156

2-131.  Population estimates for silica (SIO211), subregion 4D, Western Lake Survey -
        Phase I.                                                                   157
                                         xvn

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2-132.  Population estimates for silica (SIO211), subregion 4E, Western Lake Survey -
        Phase I.                                                                   158

2-133.  Population estimates for sodium (NA16), region 4, Western Lake Survey -
        Phase I.                                                                   159

2-134.  Population estimates for sodium (NA16), subregion 4A, Western Lake Survey -
        Phase I.                                                                   160

2-135.  Population estimates for sodium (NA16), subregion 4B, Western Lake Survey -
        Phase I.                                                                   161

2-136.  Population estimates for sodium (NA 16), subregion 4C, Western Lake Survey -
        Phase I.                                                                   162

2-137.  Population estimates for sodium (NA 16), subregion 4D, Western Lake Survey -
        Phase I.                                                                   163

2-138.  Population estimates for sodium (NA 16), subregion 4, Western Lake Survey -
        Phase I.                                                                   164

2-139.  Population estimates for sulfate (SO416), region 4, Western Lake Survey -
        Phase I.                                                                   165

2-140.  Population estimates for sulfate (SO416), subregion 4A, Western Lake Survey -
        Phase I.                                                                   166

2-141.  Population estimates for sulfate (SO416), subregion 4B, Western Lake Survey -
        Phase I.                                                                   167

2-142.  Population estimates for sulfate (SO416), subregion 4C, Western Lake Survey -
        Phase I.                                                                   168

2-143.  Population estimates for sulfate (SO416), subregion 4D, Western Lake Survey -
        Phase I.                                                                   169
                                        xvm

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2-144.   Population estimates for sulfate (SO416), subregion 4E, Western Lake Survey -
        Phase I.                                                                170

2-145.   Population estimates for turbidity (TURVAL), region 4, Western Lake Survey -
        Phase I.                                                                171

2-146.   Population estimates for turbidity (TURVAL), subregion 4A, Western Lake
        Survey - Phase I.                                                        172

2-147.   Population estimates for turbidity (TURVAL), subregion 4B, Western Lake
        Survey - Phase I.                                                        173

2-148.   Population estimates for turbidity (TURVAL), subregion 4C, Western Lake
        Survey - Phase I.                                                        174

2-149.   Population estimates for turbidity (TURVAL), subregion 4D, Western Lake
        Survey - Phase I.                                                        175

2-150.   Population estimates for turbidity (TURVAL), subregion 4E, Western Lake
        Survey - Phase I.                                                        176

2-151.   Population estimates for watershed area (WSHED), region 4, Western Lake
        Survey - Phase I.                                                        177

2-152.   Population estimates for watershed area (WSHED), subregion 4A, Western Lake
        Survey - Phase I.                                                        178

2-153.   Population estimates for watershed area (WSHED), subregion 4B, Western Lake
        Survey - Phase I.                                                        179

2-154.   Population estimates for watershed area (WSHED), subregion 4C, Western Lake
        Survey - Phase I.                                                        180

2-155.   Population estimates for watershed area (WSHED), subregion 4D, Western Lake
        Survey - Phase I.                                                        181
                                        xix

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2-156.  Population estimates for watershed area (WSHED), subregion 4E, Western Lake
        Survey - Phase I.                                                         182

 2-157. Population estimates for watershed area/lake area (WALA), region 4, Western
        Lake Survey - Phase  I.                                                    183

2-158.  Population estimates  for watershed area/lake area (WALA), subregion 4A,
        Western Lake Survey - Phase I.                                            184

2-159.  Population estimates  for watershed area/lake area (WALA), subregion 4B,
        Western Lake Survey - Phase I.                                            185

2-160.  Population estimates  for watershed area/lake area (WALA), subregion 4C,
        Western Lake Survey - Phase I.                                            186

2-161.  Population estimates  for watershed area/lake area (WALA), subregion 4D,
        Western Lake Survey - Phase I.                                            187

2-162.  Population estimates  for watershed area/lake area (WALA), subregion 4E,
        Western Lake Survey - Phase I.                                            188

4-1.    Sampled lakes in California, Western Lake Survey - Phase I.                   218

4-2.    Sampled lakes in Colorado, Western Lake Survey - Phase I.                   219

4-3.    Sampled lakes in Idaho, Western  Lake Survey - Phase I.                      220

4-4.    Sampled lakes in Montana, Western Lake Survey - Phase I.                   221

4-5.    Sampled lakes in Nevada,  Western Lake Survey - Phase I.                    222

4-6.    Sampled lakes in New Mexico, Western Lake Survey - Phase  I.               223

4-7.    Sampled lakes in Oregon,  Western Lake Survey - Phase I.                    224

4-8    Sampled lakes in Utah, Western Lake Survey - Phase I.                      225

                                          xx

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4-9.     Sampled lakes in Washington, Western Lake Survey - Phase I.                226





4-10.   Sampled lakes in Wyoming, Western Lake Survey - Phase I.                  227
                                       xxi

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                                      TABLES

2-1.    Description and Definition of Parameters Presented as Population Estimates,
        Western Lake Survey - Phase I.                                              9

3-1.    USGS Small-Scale Maps Used to Define Map Population and Characterize
        Selected Lakes, Western Lake Survey - Phase I.                               190

3-2     USGS Large-Scale Topographic Maps Used to Identify Non-Target Lakes and
        Characterize Selected Lakes, Western Lake Survey - Phase I.                   196

5-1     Description and Definition of Parameters Presented as Sample Values, Western
        Lake Survey - Phase I.                                                     231

5-2     Probability Sample Lakes Sorted by  State and Lake Name, Western Lake
        Survey - Phase I.                                                          241

5-3     Probability Sample Lakes  Sorted by Lake ID, Western Lake Survey - Phase I.      271

5-4     Data for Individual Probability Sample Lakes, Western Lake Survey - Phase I.      296

5-5     Special Interest Lakes Sorted by State and Lake Name, Western Lake Survey -
        Phase I.                                                                   480

5-6     Special Interest Lakes Sorted by Lake ID, Western Lake Survey - Phase I.      482

5-7     Data for Individual Special Interest Lakes, Western Lake Survey - Phase I.      484
                                         xx n

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                                      SECTION 1

                                   INTRODUCTION

     As part of the National Acid Precipitation Assessment Program, the U.S. Environmental
Protection Agency initiated the National Surface Water Survey (NSWS) in 1983.  The NSWS,
which includes both lakes and streams, has three primary goals and three distinct phases: (1) to
quantify the present chemical status of surface waters  in the U.S. (Phase I), (2) to assess the
temporal and spatial variability in aquatic chemistry and define the key biological resources
associated with surface waters (Phase II), and (3) to identify temporal trends in surface water
chemistry and biology (Phase III).
     The Western Lake  Survey - Phase I (WLS-I) was designed to provide the information
needed  to assess  the  chemical status of lakes in  areas of the western U.S. containing the
majority of low alkalinity systems.   Lakes were selected statistically from the population of
lakes within five western mountainous regions:  California (4A), the Pacific Northwest (4B), the
Northern Rockies (4C), the Central Rockies (4D), and the Southern Rockies (4E) (Figure 1-1).
Variables thought to influence or be influenced by surface water acidification were measured
using standardized  methods.   The  WLS-I data base may be used to investigate correlative
relationships among chemical variables on a regional basis and to estimate the chemical status of
lakes within the areas of the western United States as defined by the statistical design of the
NSWS.
     The primary objectives of the WLS-I were to:

     (1) determine the percentage (by number and area) and location of lakes that are acidic in
          potentially sensitive areas of the western United States;
     (2) determine the  percentage (by number and area) and location of lakes that have low
          acid neutralizing capacity in potentially sensitive areas of the western United States;
          and
     (3) determine the chemical characteristics of lake populations in potentially sensitive areas
          of the western United States and provide a data base for selecting lakes for future
          studies.

     Sampling for the WLS-I was completed in the fall of 1985.  The purpose of this report,
entitled Chemical Characteristics of Lakes  in the Western United States, is to  present the
results obtained during that survey.  The report consists of two volumes, Volume I: Population
Descriptions and Phvsico-Chemical Relationships, and Volume II: Data Compendium for Selected
Physical and Chemical Variables. This volume, Volume II, provides supplemental information that
was not presented in detail in Volume I. The  additional information includes data for lakes that
                                            1

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were part of the probability sample (Volume I, Section 2.2.1) and lakes that were not (special
interest lakes; Volume I, Section 2.2.4).
     This volume of the report is presented as five sections including this Introduction (Section
1).  Population estimates for selected physical and chemical variables are presented in Section 2;
this section includes a discussion of the application of the design, descriptions and definitions of
the parameters,  and  graphic  and tabular  presentations  of population  estimates  for the
probability sample lakes as cumulative frequency and areal distributions (Volume I, Section 5.1.1).
The distributions include those for physical variables (Volume I, Section 5.3), primary variables
(Volume I, Sections 5.4 and 5.5), and secondary variables (Volume I, Section 5.6). The reference
values and population estimates pertaining  to  these values are provided for the six primary
variables:  ANC, pH, sulfate, calcium, extractable aluminum, and dissolved organic carbon
(Volume I,  Section 5.4).   No reference values for the  physical variables or the secondary
variables are given.
     Section 3 lists the U.S. Geological Survey maps used to define the map population (Volume
I, Section 2.2.1), identify non-target lakes (Volume I, Section 2.2.2), and characterize selected
lakes (Volume I, Section 2.4). Additionally, maps showing the locations of sampled lakes within
each of the ten  states sampled are  presented  in Section 4.   The final section, Section 5,
presents data for individual probability sample lakes and special interest lakes. Lists of lakes
sorted by state and lake name and  by lake ID  are provided.
     The data presented here are a subset of the WLS-I data base.  Information concerning the
distribution of the complete data set is presented in the Notice (page ii). The correct use and
interpretation of these data require an understanding the WLS-I design described in detail in
Volume I, Section 2.3. Explanation of the cumulative distributions is given in Volume I, Section
5.1.1  and in this volume, Section 2.2.

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                                     SECTION 2

POPULATION ESTIMATES FOR SELECTED PHYSICAL AND CHEMICAL VARIABLES

     The primary data output from the WLS-I data base are cumulative distributions for total
lake number and total lake area in any population or subpopulation of lakes explicitly defined by
the investigator. The distributions presented here were generated from sample data using the
procedures described below (Section 2.1) for the subpopulation of lakes <2000 ha within the
target population.
     The variables described in this  section are  listed  in Table 2-1.   Table 2-1  lists, in
alphabetical order, the names and  units of  the  parameters presented in  this  volume.
Additionally, the name of each parameter as it  appears  in the data base is given.  Brief
definitions and/or descriptions of the methods used in their determination are given for the
parameters.  More extensive descriptions are given in Volume I, Section 2.  The statistics and
distributions describing the  subpopulation of lakes are given in Section  2.2.  Cumulative
frequency distributions are presented as F(x) or  l-F(x), and areal distributions as  G(x) or
l-G(x), depending on  whether low or high concentrations (or values),  respectively, are of
primary interest.

2.1  APPLICATIONS OF THE DESIGN

2.1.1  Extrapolation from Sample to Population
     When population estimates from combined strata are required (for example, when making
subregional or regional estimates), expansion factors or weights (W) must be used because the
sampling intensity varied among strata. These weight factors (the stratum target population size
divided by the stratum sample size) vary considerably among strata; for example, a lake sampled
in one stratum may represent 3 lakes while  each sampled lake in another stratum may represent
36 lakes.
     This design permits strata to  be combined when it is meaningful to do so. The flexibility
of the design also allows estimates to be made for specific subpopulations; however, use of the
data without careful definition of the population of interest can be misleading.

2.1.2 Estimating the Target Population Size and Subpopulations
     The first steps in the statistical analysis of the data were to estimate  the target population
size in each stratum (N) and to determine the stratum-specific weights needed for interstratum
estimation.  The target population size in each stratum was  estimated in two units: numbers of
lakes and lake area (in hectares).
     The process for calculating the estimated number of target lakes in a  stratum (ft)  is shown
in Volume  I, Figure 2-4.   The  map population consists  of  both a target and a nontarget
                                           4

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                                                following equation:

         P  1/W - (n*/N*) q
   where N   the size of the sample drawn from the map population
          n  - the size of the map population
           q - the probability that a target lake in the drawn sample is  actually visited;
             computed by dividing the actual number of lakes visited (n - nnj, - n0) by the
             number of lakes intended to be visited (n   - nn^)
             where nnb * the number of non- target lakes in the original sample (as determined
                        from the maps), and
                   n0 - the number of lakes not visited.

     Hence, P is the probability of obtaining a water sample from any target lake in the map
population.  Note that each lake within a stratum has the same value of P and hence the same
W, but that lakes from different strata can have different weights depending on the values of
n , N , or q. Within a stratum, the estimated number of target lakes in the map population is:
N   W(n***).                                                                       (2)
An alternate expression for W is thus ft/n
     The estimated target lake area in a stratum (A) was calculated similarly by multiplying the
total area of visited target lakes (A) by the stratum weight: A - W(A)              (3)
The variance of N and A, for single strata, were estimated by:

           N* [(N* - n')/(n'-J)][n***/n'][(n' - n***)/n']                              (4)
           N [(N* - nWhll/n'MEA2 - (I2/n'J                               (5)
where n', the "effective sample size", is used in place of n  because of incomplete visitation (i.e.
n' - qn ).  The standard errors are calculated as the square roots of the variances.
     For estimates of populations covering multiple strata, estimates and variances must  be
computed within strata and added or else computed with equations containing weights.  Any
explicitly defined subset of the total population of target lakes in the West is a subpopulation.
Subpopulations can be defined over any combination of strata.  For example, for any variable x,
each observed value defines a subpopulation of lakes having a value of x less than or equal to
that value.  Subpopulation definitions can also be based on geographic boundaries such as states
or national parks.

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     Estimates for subpopulations that are defined within single strata can be generated using
formulae that are modifications of the equations given above (mathematically identical to the
algorithms used in generating all the statistics for the Survey).  To generate single stratum
subpopulation equations from equations 2 through 5, each n    is replaced by nz and each  by
Yj. where:  nz  the number of samples lakes in the subpopulation z and Ya. m tne summation
over the sample lakes in the subpopulation  z.
     A useful generalization, appropriate for any subpopulation and any combination of strata,
is  that,

     fr - EW, and X  - WA,                                                       (6)

where summation is over the appropriate subset of sample lakes in the appropriate strata, and
where the values of W are assigned according to the stratum in which the lake belongs.
     A further  generalization, used in the data analyses, leads to a similar formulae for the
estimated  variance of any variable, X, over any subpopulation and combination of strata:

     Variance(X) - WX2/W . (WX/W)2.                                       (7)
Where the set of sample lakes in the summation defines the subpopulation of lakes for which the
variance is estimated.
     The weighting factors are extremely important.  Estimating population parameters from
sample data without accounting for weights can lead to erroneous calculations and incorrect
interpretation.   Examining relationships  among variables with  the  expectation  that these
relationships are representative of the population should only be done within strata or by using
weighting factors. Examples of the use of equations  1-6 are given in Volume I, Section 2.3.2.
2.2  DATA PRESENTATION

     The description of each population was summarized on a single page of output for each
variable.  The cumulative distributions, F(x) and C(x), supplemented by descriptive statistics,
serve as the primary data outputs.  Each page of data output (Figures 2-1 through 2-162) is
identified at the top by the name of the variable (chemical or physical parameter) and by the
definition of the subset of lakes being examined.  A subset can be defined on the basis of any
physical or chemical variable or design stratification factor (region, subregion, or alkalinity map
class), either singly or in combination.
     The basic population estimates, N and X (denoted only as N and A on the output), and the
standard errors of these estimates are presented in the heading of the output.  N is  defined as
the  estimated  total number of lakes  in  the population being described, and A is the total
amount of lake area (ha) over all lakes in that population. The indicated sample size (equivalent

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to n***, Volume I, Section 2.3.2) is the number of sampled lakes in the target population being
described. The identity of reference values (Xcj, XC2, XC3> chosen for comparative analyses of
that variable completes the heading material on each page of output.
     Interpretation of the distributions F(x) and G(x) are given in Volume I, Section 5.1.1. This
section describes the distributions  l-F(x) and l-G(x),  which are similar in interpretation,
representing estimated frequency and areal distributions, respectively.  For any value x for
variable X, l-F(x) is interpreted as the estimated proportion of lakes having a value of X >x.
l-F(x) is calculated as the ratio of frx, the estimated number of lakes having a value of X >x,
to fa. The  upper 95 percent confidence limit on faK, also scaled by dividing by fa, is shown as
a dashed line in  the figures. Although only a one-sided upper 95 percent confidence limit is
shown, a two-sided  90 percent limit  can  be made  by using the existing bound and one
equidistant below the distribution curve. This procedure would also provide a lower 95 percent
one-sided limit.
     The function 1 -G(x) is the estimated proportion of lake area in the  population having a
value of X >_x, for any variable X. This cumulative areal curve and its confidence curve are
determined analogously to the l-F(x) curves.
     An example of interpreting these distributions is derived from Figure 2-139.  At the value
of Sulfate - 50 ueq L"1, 1-F(50) - .13 (calculated and shown on the figure as pcj - .135); the
upper limit is  read from the dashed line as .17. These values are multiplied by the estimated
total number of lakes in the population, 10393, to yield 1351 (calculated and shown on the figure
as Ncj   1405) as the estimated number of lakes in the population having Sulfate > 50 ueq L'1,
and an upper confidence limit for that number,  1767 (calculated and shown on  the figure as
Ncuj - 1676).  The difference between the calculated values and those derived from the figure is
due to the imprecision of obtaining the proportions (.13 and .17) from the  curve.  The practice
of reading  values from the curves is suitable only for obtaining rough estimates, due to the
potential error that can be introduced.  Precise computation requires the  use of  the data base
and the appropriate algorithms.
     Similarly, at Sulfate - 50 ueq L~' the l-G(x) curve yields .20 (calculated and shown on the
figure as gcj - .199) with an upper limit of .31.  Multiplying these by total lake area in the
population (181851 ha) yields 36370 ha (calculated and shown on the figure as Aci  36138 ha)
and 56374 ha  (calculated and shown on the figure as Acuj - 54507 ha) for the estimate and
upper  limit for the lake area above  Sulfate -  50 ueq L'1.   Again,  estimates from  the
distributions should be made with caution.
     A plot of l-F(x) cannot be used to get confidence bounds on the numbers of lakes below
a reference value of X.   When  the reference value for variable X might  best be discussed in
terms of the population less than x, the plots are presented as complementary distributions, F(x)

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and G(x), which can be computed for any variable of interest. Examples of these descriptions
are found in Volume I, Section 5.1.1.
     Associated with each distribution are the following  descriptive statistics:

     o Mean  and  standard deviation,  appropriately  weighted  to  reflect the  estimated
       distribution, l-F(x) [or F(x)J. There are no comparable statistics for l-G(x) [or G(x)].

     o Min and Max are the minimum and maximum values of variable X observed in samples
       for the population or subpopulation being examined.

     o The median is the estimated value of variable X such that half the number of lakes, or
       half the lake area, in the population are below this value.

     o The quintiles (Qj, Q2, Q3, Q4, Q5> are the values of X that partition the distribution
       into 5 equal parts (e.g., the 4th quintile is the  80th  percentile; Q5 is the  maximum
       value).   These  values  are particularly useful in  comparing differences  among
       subpopulations. The interquintile difference (Q Xc (or <

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Table 2-1  Description and Definition of Parameters Presented as Population Estimates, Western
           Lake Survey - Phase I
Parameter (unit)     Data Base Name
                     Description/Definition
Acid Neutralizing       ALKA11
  Capacity (ueq L"1)
            Acid neutralizing capacity is a measure of the amount
            of  acid  necessary  to  neutralize  the bicarbonate,
            carbonate, hydroxyl, and other bases in a sample. Acid
            neutralizing capacity was measured in the analytical
            laboratory in an unfiltered, unacidified  aliquot, using
            acidimetric  titration and  modified  Gran  analysis
            (Hillman) et al.  1986; Kramer 1984).
Aluminum, Extractable  ALEX 11
  (ug L-1)
Aluminum, Total
ALTL11
Ammonium (ueq L"1)   NH416
Extractable aluminum is an estimate of labile,
monomeric aluminum.  Aluminum in an unacidified,
filtered sample was complexed with 8-hydroxyquinoline
and extracted with methyl-isobutyl ketone (MIBK) in the
field laboratory. The aluminum was then measured in
the analytical laboratory, using the method described in
Hillman et al. (1986). Values were converted from mg
L~l to ug L~l for data analysis.

Total aluminum was measured in the analytical (ug L"1)
laboratory in an unfiltered, acidified (HNO3) aliquot
(EPA 202.2, AAS, atomic  absorption spectroscopy,
graphite furnace). Values were converted from mg L~1
to ug L"1 for data analysis.

Ammonium ion was measured in the analytical laboratory
in a filtered, acidified (H2SO4) aliquot (EPA 350.1,
colorimetric, automated). Values were converted from
mg L'1 to ueq L'1  for data analysis.
(continued)

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TABLE 2-1.  (Continued)
Parameter (unit)     Data Base Name
                     Description/Definition
Calcium (ueq L-l)
CA16
Chloride (ueq L'1)     CL16
Calcium was measured in the analytical laboratory in a
filtered, acidified (HNO3) aliquot (EPA 215.1, A AS,
flame). Values were converted from mg L~* to ueq L'1
for data analysis.

Chloride ion was measured in the analytical laboratory
in an aliquot from a filtered, unacidified sample (ASTM
1984; O'Dell et al. 1984, ion chromatographic methods).
Values were converted from mg L" * to ueq L~J for data
analysis.
Color, True (PCU)
COLVAL
Conductance (uS cm'1)  CONDI 1
True color is a measure of the dissolved and colloidal
substances in  water that  reduce  light transmission.
True color was measured in the field laboratory in a
centrifuged aliquot (to remove particles), using a Hach
model CO-1 Comparator (EPA 110.2, modified).

Conductance is a measure of the resistance of a water
sample  to an  electrical current.   Conductance  was
measured in   the  analytical  laboratory  using  a
conductivity cell (EPA 120.1).
Date Sampled
DATSMP    Date sampled is the date on which the lake sample was
             collected.
Depth, Site (m)
SITDPM     Sampling-site depth was measured using a weighted line,
             and was not necessarily the maximum lake depth.
(continued)
                                         10

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TABLE 2-1. (Continued)
Parameter (unit)     Data Base Name
                     Description/Definition
Dissolved Inorganic
  Carbon (mg L'*)
DICVAL     Dissolved inorganic carbon was measured in the field
             laboratory.   The  sample was drawn directly into a
             syringe from the Van Dorn water sampler at the lake
             site, filtered, and analyzed, without exposure to the
             atmosphere, using a Dohrmann model DC-80 carbon
             analyzer with an infrared spectrophotometric detector
             (EPA 415.2, modified).
Dissolved Organic
  Carbon (mg L~*
DOC11       Dissolved organic carbon was measured in the analytical
             laboratory in a filtered, acidified (H2SO4) aliquot (EPA
             415.2, infrared spectrophotometric detector).
Elevation, Lake (m)     ELEV
Fluoride (ueq L'1)      FTL16
Iron (ug L~')
Lake Area (ha)
(continued)
             Elevation of the lake surface was determined from USGS
             topographic maps or was estimated from  topographic
             contour lines.

             Total dissolved fluoride was measured in the analytical
             laboratory in a filtered, unacidified aliquot, using an
             ion-selective electrode (ISE,  EPA 340.2, modified).
             Values were converted from mg L"1 to ueq L~* for data
             analysis.

             Dissolved   iron  was  measured  in  the analytical
             laboratory, in a filtered, acidified (HNC>3) aliquot (EPA
             236.1, A AS, flame). Values were converted from mg L" *
             to ug L~l  for data analysis.
LAKE_SIZ  Lake surface area was measured on USGS topographic
             maps using an electronic planimeter.
FEU
                                         11

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TABLE 2-1.  (Continued)
Parameter (unit)      Data Base Name
                    Description/Definition
Lake ID
LAKE_ID  Lake ID is a seven-character, unique identification code
            assigned  to each lake.  The first character is a digit
            representing the Region (1, 2, or 3); second is a letter
            indicating the subregion; the third is a digit, giving the
            alkalinity map class; and the fourth, a dash.  The last
            three digits are the assigned lake number.
Lake Name
LAKENAMELake name was taken from the USGS topographic maps
            or,  in  some  cases, substituted  with  more  recent
            information from state sources.  When a number  of
            small water bodies were identified by only one name on
            the map, a qualifier was added to the name, such as
            "southern," to identify the lake sampled. When no name
            was listed, "(NO NAME)" was entered into the data base
            as the lake name.
Latitude
LAT
Latitude was read from the USGS topographic maps in
DD-MM-SS (degrees-minutes-seconds) format.
Longitude
LONG
Magnesium (ueq L~')   MG16
Longitude was read from the USGS topographic maps in
DDD-MM-SS format.

Dissolved magnesium was  measured in the analytical
laboratory in a filtered, acidified (HNO3) aliquot (EPA
242.1, AAS, flame or furnace). Values were converted
from mg L"1 to ueq L~* for data analysis.
Manganese (ug L"J)     MN11
             Dissolved manganese  was measured in the analytical
             laboratory in a filtered, acidified (HNO3) aliquot (EPA
             243. 1 , AAS, flame). Values were converted from mg L~ }
             to ug L"1 for data analysis.
(continued)
                                         12

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Table 2-1.  (Continued)
Parameter (unit)     Data Base Name
                     Description/Definition
Nitrate (ueq L'1)       NO316
             Nitrate ion was measured in the analytical laboratory in
             a filtered, unacidified aliquot, using ion chromatography
             (ASTM 1984; O'Dell et al. 1984). Values were converted
             from mg L"1  to ueq L~* for data analysis.
PH
PHSTVL     Closed system pH was measured in the field laboratory,
             using  an Orion model 611 meter and  an Orion Ross
             combination pH electrode in a syringe sample unexposed
             to the atmosphere (EPA 150.1).
Phosphorus, total
  (ug L'1)
PTL11
Potassium (ueq L-l)    K16
Secchi Disk
  Transparency (m)
Total phosphorous was measured in the analytical
laboratory in an unfiltered, acidified (H2SO4) aliquot,
using  either   of   two  automated,   colorimetric,
phosphomolybdate methods:   for normal phosphorus
levels, using a 15-mm absorption cell, or for low levels,
a preliminary method using a 50-mm absorption cell
(USGS1-4600-78). Values were converted from mg L" *
to ug L'1 for data analysis.

Dissolved potassium was measured  in the  analytical
laboratory in a filtered, acidified (HNO3) aliquot (EPA
258.1, AAS, flame). Values were converted from mg L~*
to ueq L'1 for data analysis.
SECMEAN   Secchi disk transparency was determined by averaging
             the   depths   of  Secchi  disk  disappearance   and
             reappearance. When the Secchi disk was visible on the
             lake bottom, that value was entered.
(continued)
                                         13

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TABLE 2-1.  (Continued)
Parameter (unit)     Data Base Name
                     Description/Definition
Silica (mg L'1)
State
Turbidity (NTU)
SIO211
Sodium (ueq L'1)       NA16
ST
Sulfate (ueq L'1)       SO416
Silica was measured in the analytical laboratory in an
unfiltered  aliquot (USGS  1-2700-78,  colorimetric,
molybdate blue, automated method).

Dissolved sodium was measured  in the  analytical
laboratory in a filtered, acidified (HNO3> aliquot (EPA
273.1, A AS, flame). Values were converted from mg L"1
to ueq L"1 for data analysis.

State is the state in which the lake is located, indicated
as the standard two-character postal state abbreviation.

Sulfate ion was measured in the analytical laboratory in
the filtered aliquot, using ion chromatography (ASTM
1984; O'Dell et al. 1984).  Values were converted from
mg L~* to ueq L~* for data analysis.
TURVAL    Turbidity was measured in the field laboratory, using a
             Monitek   model  21   nephelometer,  reported  in
             nephelometric turbidity units (EPA 180.1).
WA/LA                WALA

Watershed Area (ha)    WSHED
             WA/LA is the ratio of watershed area to lake area.

             Watershed area, which includes lake area, was measured
             on  large scale USGS topographic  maps  using  an
             electronic planimeter.
                                          14

-------
VARIABLE: EXT ALUM IN UG/L FOR CLEARWATER LAKESs.2000 HA
Xc1:  50.0
                Xc2: 100.0
                                 :  150.0
Population Size (N): 9991   SE(N): 226.1
Lake Area (A):  178523     SE(A): 27268
                                           Sample Size: 693
REGION
SUB_RGN
CLASS
   o.o
      0.0   5.0     10.0   15.0    20.0   25.0    .30.0    35.0   40.0    45.0   50.0
Min:  0.00  Q^ 0.56    Q2: 2.19    Q^:  3.58    Q4: 6.62     Max: 59.70
Median:   2.80
Mean:     4.41
Std. Dev.:  5.71
                     PROPORTIONS AND NUMBERS ABOVE THE VALUE OF Xc
                    pc1:  0.002  Ncl: 16      Ncu1: 35
                    pc2:  0.000  Nc2:0       Ncu2: **
                    Pc3: 0.000  Nc3: 0       Ncu3: **
   1.0
   0.8
   0.6-
   0.4-
   0.2-
   0.0'
      0.0    5.0    10.0    15.0    20.0
Min:  0.00   QJ: 0.40    Q2: 1.82
                                      25.0    30.0   35.0    40.0    45.0   50.0
                                     3:  3.77    Q4:  7.19      Max:  59.70
Median:  2.49
 ** Not Defined
                     PROPORTIONS AND AREA ABOVE THE VALUE OF X
                 gc-|.-  0.000   Acl:  43
                 gc2:  0.000  Ac2:  0
                 gc3:  0.000  Ac3:  0
                                                  cu1:
                                                       97
                                                 Acu2: **
                                                 Acu3: **
    Figure 2-1    Population estimates for aluminum, extractable (ALEX11)  in
                  clearwater lakes, region 4, Western Lake Survey - Phase I.
                                   15

-------
VARIABLE: EXT ALUM IN UG/L FOR CLEARWATER LAKESs.2000 HA
    c1:
        50.0
                Xc2: 100.0
Xc3: 150.0
Population Size (N):  2333  SE(N):  80.6
Lake Area (A):  35786     SE(A): 5289
                                            Sample Size: 143
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   O.D-
      0.0   5.0    10.0
Min:  0.00  Q-|:  1.17
                                       "T"
                                              -T
                      f"
"r
                          15.0    20.0    25.0    30.0    35.0   40.0    45.0    50.0
                         Q2: 2.30    Q3:  3.40    Q4: 4.57     Max: 54.30
Median:   2.68
Mean:     3.66
Std. Dev.:  4.05
PROPORTIONS AND NUMBERS ABOVE THE VALUE OF
pc1: 0.002 Nc1: 5 Ncul: 13
pc2: 0.000 Nc2:0 Ncu2: **
Pc3: 0.000 Nc3: 0 Ncu3: **
Xc
Min:



O.B-



0.6-

^(y\
A'v
0.4-



0.2-

\
\
i
\\
i >
V 1
\ i
V
v
1 k
i
I;

k
1 V
V v^

^.
0.0 5.0
















	 ^_
10.0 15.0 20.0 25.0 30.0 35.0 40.0 45
: 0.00 Q-|: 0.46 Q2: 1.56 Q3: 2.41 Q4: 3.45 Max:

dian: 1.78

i" Not Defined
PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
gc1: 0.000 Acl: 10 Acu1: 24
gc2: 0.000 Ac2: 0 Acu2: **
gc3: 0.000 Ac3: 0 Acu3: **


































.0 50.0
54.30




  Figure 2-2    Population estimates for aluminum, extractable (ALEX11) in
                clearwater lakes, subregion 4A, Western  Lake Survey - Phase I.
                                    16

-------
VARIABLE: EXT ALUM IN UG/L FOR CLEARWATER LAKES^2000 HA
   Xc1: 50.0    X
                  c2:
                     100.0
150.0
Population Size (N): 1660  SE(N):  63.3
Lake Area (A):  67213      SE(A): 23352
                                             Sample Size: 155
   0.0
      0.0   5.0    10.0    15.0    20.0    25.0    30.0    35.0   40.0   45.0   50.0
Min:  0.00   Q-,;  2.13     Q2: 4.12     Q3:  6.70     Q4: 11.10     Max: 59.70
Median:   5.58
Mean:     7.55
Std. Dev.:  8.08
PROPORTIONS AND NUMBERS ABOVE THE
pc1: 0.006 Nc1: 11 Ncul: 27
pc2: 0.000 Nc2:0 Ncu2: **
Pc3: 0.000 Nc3: 0 Ncu3: **
VALUE OF Xc
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0
Min:  0.00   Q^


Median:  7.18

 ** Not Defined


  Figure 2-3
            5.0     10.0    15.0    20.0    25.0   30.0   35.0   40.0   45.0    50.0
            Q^ 2.61     Q2: 7.16    Q3: 7.20     Q4: 12.93     Max: 59.70
PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
9c1:
9c2:
9c3:
0.000
0.000
0.000
Ac1;
Ac2:
AC3^
33
0
0
Acu1:
Acu2:
Acu3:
85
**
**
                Population estimates for aluminum,  extractable  (ALEX11) in
                clearwater lakes, subregion 4B, Western Lake Survey - Phase I.
                                     17

-------
VARIABLE: EXT ALUM IN UG/L FOR CLEARWATER LAKES^2000 HA
   Xcl:  50.0    Xc2: 100.0     Xc3:
                              150.0
Population Size (N):  2305  SE(N): 145.5
Lake Area (A):  35608     SE(A): 11326
                                       Sample Size: 141
   o.o
Min:
 0.0
0.00
       5.0
                   10.0    15.0   20.0   25.0   30.0   35.0   40.0    45.0    50.0
                 1.10     Q2: 2.77     Q3:  3.99     Q4: 7.20     Max: 38.20
Median:   3.26
Mean:     4.74
Std. Dev.:  5.11
PROPORTIONS AND NUMBERS ABOVE THE
pcl: 0.000 Nc1: 0 Ncul: **
pc2: 0.000 Nc2:0 Ncu2: **
Pc3: 0.000 Nc3: 0 Ncu3: *+
VALUE OF Xc
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   5.0    10.0    15 0   20.0   25.0   30.0   35.0   40.0    45.0    50.0
Min:  0.00   Qj:  0.00    Q2: 1,38     Q3: 2.35     Q4: 3.78     Max: 38.20
Median: 2.25
 ** Not Defined

   Figure 2-4
PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
gc1: 0.000
gc2: 0.000
gc3: 0.000
A i: 0
Ac2: 0
Ac3: 0
Acu1:
Acu2:
Acu3:
**
**
**
           Population estimates for aluminum, extractable (ALEX11) in
           clearwater lakes, subregion 4C, Western Lake Survey - Phase I.
                                    18

-------
VARIABLE: EXT ALUM IN UG/L  FOR CLEARWATER LAKES
-------
VARIABLE: EXT ALUM IN UG/L FOR CLEARWATER LAKES^2000 HA
   X
    c1:
50.0    Xc2: 100.0    Xc3: 150.0
Population Size (N): 1503
Lake Area (A):  11787
                         SE(N): 110.6
                         SE(A): 2989
                                   Sample Size:  132
 REGION    4
- SUB_RGN E
 CLASS
   1.0-
   0.8-


   0.6-

1-FOO
   0.4-


   0.2-
   0.0-
      0.0   5.0     10.0
Min:   0.00    Q-,: 0.07
                  15.0    20.0    25.0   30.0   35.0    40.0    45.0    50.0
                 Q2:  1.89     Q3:  2.89     Q4:  6.70      Max: 45.10
Median:   2.46
Mean:     4.58
Std. Dev.:  6.38
PROPORTIONS AND NUMBERS ABOVE THE
pcl: 0.000 Nc1: 0 Ncul: **
pc2: 0.000 Nc2: 0 Ncu2: **
Pc3: 0.000 Nc3: 0 Ncu3: **
VALUE OF Xc
O.B-
0.6-
0.4-
0.2-
Min: C
Median
t+ Nc
i
i
i
i
y
I
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45
.00 Q-|: 0.73 Q2: 1.90 Q3: 2.90 Q4: 3.09 Max:
PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
2.00 gc1: 0.000 Ac1: 0 Acu1: **
gc2: 0.000 Ac2: 0 Acu2: **
>t Defined 9c3: -000 Ac3:  Acu3: **

0 5
45.10


3.0

  Figure 2-6    Population estimates for aluminum, extractable (ALEX11) in
               clearwater lakes, subregion 4E, Western Lake Survey - Phase I.
                                      20

-------
   VARIABLE: TOTAL ALUMINUM AS UG/L FOR LAKES ^2000 HA

   Population Size (N): 10393 SE(N): 219.4       Sample Size:  719
   Lake Area (A):   181851     SE(A): 27248
      1.0
      0.8-
      0.6-
      0.4-
      0.2-
      O.D
REGION    4
SUB_RGN
CLASS
         0.0   5.0    10.0    15.0    20.0   25.0   30.0   35.0    40.0    45.0    50.0
   Min:  0.70    Q^  13.11     Q2: 19.47    Q3:  27.89    Q4:  41.96     Max:  1119.00
   Median.    23.27
   Mean:     38.66
   Std. Dev.:  74.09
      0.0
         0.0    5.0     10.0    15.0    20.0   25.0    30.0    35.0    40.0    45.0    50.0
   Min:  0.70   Qj: 15.07    Q2: 23.28   Q^:  26.16    Q4: 41.13     Max: 1119.00


   Median.  25.66


Figure 2-6a   Population estimates for aluminum, total (ALTL11) in clearwater lakes, region 4,
              Western Lake Survey - Phase I.
                                        21

-------
   VARIABLE: TOTAL ALUMINUM AS UG/L FOR LAKES -s.2000 HA

   Population Size (N): 2401   SE(N): 74.5        Sample Size:  149
   Lake Area (A):  36009     SE(A): 5284
       1.0
      0.8-
      0.6-
      0.4-
      0.2-
      0.0'
REGION   4
SUB_RGN A
CLASS
          0.0    5.0    10.0    15.0    20.0    25.0   30.0   35.0    40.0    45.0    50.0
   Win:   3.90   Qj: 14.39   Q2: 19.94    Q3: 28.98    Q4: 40.44    Max: 334.20
   Median:   24.48
   Mean:     30.06
   Std. Dev.: 26.06
      o.o
          0.0    5.0    10.0    15.0    20.0    25.0   30.0   35.0    40.0    45.0    50.0
   Min:   3.90   Qj: 13.72    Q2: 16.14     Q3: 21.27    Q4: 32.09    Max: 334.20

   Median: 18.62

Figure 2-6b  Population estimates for aluminum, total (ALTL11) in clearwater lakes, subregion
             4A, Western Lake Survey - Phase I.
                                        22

-------
 VARIABLE: TOTAL ALUMINUM AS UG/L FOR LAKES ^2000 HA

 Population Size (N): 1706   SE(N):  61.7         Sample Size: 159
 Lake Area (A):  68038     SE(A):  23335
REGION   4
SUB_RGN B
CLASS
    1.0
   0.8-


   0.6-
 1-FOO

   0.4-


   0.2-
   0.0-
       0.0    5.0     10.0     15.0    20.0    25.0    30.0    35.0    40.0    45.0   50.0
 Min:  8.05   Q^ 18.38   Q2-  25.57   Q3:  37.80   Q4: 54.00    Max:  876.90


 Median:   30.03
 Mean:    47.81
 Std. Dev.: 76.19
    1.0
   08-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0   40.0   45.0    50.0
Min:   8.05   Qj: 25.38   Q2: 25.67    0$:  25.97    Q4: 40.91    Max:  876.90

Median: 25.76

Figure 2-6c  Population estimates for aluminum, total (ALTL11) in clearwater lakes, lubregion
             4B, Western Lake Survey - Phase I.
                                     23

-------
   VARIABLE: TOTAL ALUMINUM AS UG/L FOR LAKES *_2000 HA

   Population Size (N): 2379  SE(N):  143.3       Sample Size:  143
   Lake Area (A):  36065     SE(A):  11314
REGION    4
SUB_RGN C
CLASS
      1.0
      0.8-
      0.6-
      0.4-
      0.2-
      0.0
         0.0    5.0     10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
   Min:  8.85   QI: 16.49    Q2:  21.08   Q3:  28.95    Q4: 43.58    Max: 396.40


   Median.   26.06
   Mean:    36.24
   Std. Dev.: 48.52
      o.o
         -    5.0     10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
   Min:  8.85   QI: 21.36    Q2: 33.76   Q3:  40.04   Q4: 49.78     Max:  396.40

   Median:  33.79

Figure 2-6d  Population estimates for aluminum, total (ALTL11) in clearwater lakes, subregion
             4C, Western Lake Survey - Phase I.
                                        24

-------
    VARIABLE: TOTAL ALUMINUM AS UG/L FOR LAKES ^2000 HA

    Population Size (N): 2299  SE(N):  83.0        Sample Size:  129
    Lake Area (A):  29786      SE(A): 5756
REGION    4
SUB.RGN D
CLASS
       1.0
      0.8-
       0.6-
       0.4-
       0.2-
       O.D
          0.0    5.0     10.0    15.0    20.0    25.Q    30.0    35.0    40.0    45.0    50.0
    Min:  0.70   Q^ 7.54     Q2:  11.70    Q^:  20.20    Q4:  36.69    Max: 1119.00


    Median:   15.90
    Mean:    31.76
    Std. Dev.: 93.78
       1 0
      0.8-
      0.6-
      0.4-
      0.2-
      o.o r      i       i       i       i       i       i       i       i       i       f
          0.0    5.0     10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
   Min:   0.70   QJ: 6.87    Q2: 7.68     Q^:  13.15    04: 23.36    Max: 1119.00

   Median: 11.13
Figure 2-6e    Population estimates for aluminum, total (ALTL11) in clearwater lakes, subregion
              4D,  Western Lake Survey - Phase I.
                                        25

-------
  VARIABLE: TOTAL ALUMINUM AS UG/L FOR LAKES ^.2000 HA

  Population Size (N): 1609  SE(N): 106.6       Sample Size:  139
  Lake Area (A):  11953      SE(A): 2983
REGION    4
SUB.RGN  E
CLASS
     o.o
         0.0    5.0    10.0    15.0    20.0    25.0   30.0   35.0   40.0    45.0    50.0
  Min:   1.45    C^:  8.10     Q2: 15.20   Q3: 24.46    Q4: 41.33    Max: 530.00
  Median:   19.71
  Mean:     55.23
  Std. Dev.: 108.13
      1.0
     0.6-
     0.6-
     0.4-
     0.2-
     0.0
         0.0    5.0    10.0    15.0    20.0   25.0   30.0   35.0    40.0    45.0    50.0
  Min:   1.45    Qf.  13.47    Q2: 32.60   Q3: 35.00    Q4: 90.09    Max: 530.00

  Median: 34.48
Figure  2-6f   Population estimates for aluminum, total (ALTL11) in clearwater lakes, subregion
             4E, Western Lake Survey - Phase I.
                                        26

-------
VARIABLE: ANC AS UEQ/L FOR LAKESs.2000 HA
    Xc1: 0.0     Xc2: 50.0     Xc3: 200.0
Population Size (N): 10393 SE(N):  219.4        Sample Size:  719
Lake Area (A):  181851      SE(A):  27248
    1.D-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0-
      -100.0 0.0    100.0  200.0  300.0  400.0   500.0  600.0  700.0  800.0  900.0  1000.0
Min: -24.00  Qj: 54.50   Q2:  94.00   Q3:  163.27  Q4: 425.63    Max: 4948.60
Median:   119.35
Mean:     327.75
Std. Dev.: 522.68
PROPORTIONS AND NUMBERS BELOW THE
pcl: 0.001 Ncl: 15 Ncu1: 39
pc2: 0.168 Nc2:1745 Ncu2: 2004
pc3: 0.666 Nc3: 6926 Ncu3: 7276
VALUE OF Xc
   0.0
     -100.0 0.0   100.0  200.0  300.0  400.0  500.0  600.0  700.0  800.0  900.0  1000.0
Min: -24.00  Qj:  93.90   Q2: 241.86   Q3: 359.09  Q4: 529.21    Max:  4948.60
Median: 286.31
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9c1:
9c2:
9c3:
0.003
0.080
0.361
Ac1:
Ac2:
Ac3:
579
14501
65591
Acu1:
Acu2:
Acu3:
1499
18988
74624
    Figure 2-7    Population estimates for acid neutralizing capacity (ALKA11),
                  region 4, Western Lake Survey - Phase I.
                                     27

-------
VARIABLE: ANC AS UEQ/L FOR LAKES-s.2000 HA
   Xc1: 0.0     Xc2: 50.0      Xc3:  200.0
Population Size (N): 2401   SE(N):  74.5        Sample Size:  149
Lake Area (A):  36009     SE(A):  5284
   1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      -100.0 0.0    100.0  200.0  300.0 400.0  500.0  600.0  700.0  800.0  900.0 1000.0
Min:   12.90   Q^ 34.49   Q2:  52.39   03:  75.04    Q4: 136.91    Max: 3172.00
Median:   62.63
Mean:     121.34
Std. Dev.: 221.95
PROPORTIONS AND NUMBERS BELOW THE
pc1: 0.000 Ncl: 0 Ncu1: **
pc2: 0.367 Nc2:880 Ncu2: 1081
pc3: 0.866 Nc3: 2078 Ncu3: 2233
VALUE OF Xc
   1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0-
      -100.0 0.0
Min:   12.90   Q^.


Median: 106.06

 ** Not Defined
                  100.0  200.0  300.0  400.0  500.0  600.0  700.0  800.0  900.0  1000.0
                 42.46   Q2: 71.37    Q3:  166.41   Q4: 386.21   Max: 3172.00
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
gcl: 0.000
gc2: 0.234
gc3: 0.612
Acl: 0
Ac2: 8423
Ac3: 22034
Acu1: **
Acu2: 12544
Acu3: 27706
  Figure 2-8    Population estimates for acid neutralizing capacity (ALKA11),
                subregion 4A, Western Lake Survey - Phase I.
                                       28

-------
VARIABLE: ANC AS UEQ/L FOR LAKES<.2000 HA
   Xc1: -      Xc2:  50-      Xc3:  200'
Population Size (N): 1706   SE(N): 61.7        Sample Size: 159
Lake Area (A):  68038     SE(A): 23335
    1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      -100.0 0.0   100.0  200.0  300.0  400.0  500.0  600.0  700.0  800.0  900.0  1000.0
Min:   3.90   Q,: 51.71     Q2:  97.32   Q3:  168.20   Q4: 293.15   Max:  1807.70
Median.   139.77
Mean:     204.24
Std. Dev.: 252.65
PROPORTIONS AND NUMBERS BELOW THE VALUE
pc1: 0.000 Nc1: 0 Ncu1: **
pc2: 0.195 Nc2:332 Ncu2: 415
Pc3: 0.716 Nc3: 1222 Ncu3: 1333
OFXC
    1.0
   0.8-

   0.6-
G(X)
   0.4-

   0.2-
   0.0
      -100.0 0.0
Min:   3.90   Q^

Median: 286.52

 *+ Not Defined

   Figure 2-9
                 100.0   200.0  300.0  400.0  500.0  600.0   700.0  800.0  900.0  1000.0
                 199.32  Q2:  283.52  Q3:  349.40   Q4: 358.17   Max: 1807.70
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9c1:
9c2:
9c3:
0.000 A
0.043 A
0.216 A
c1: 
^: 2916
**.
c3: 14721
Acu1:
Acu2:
Acu3:
**
4197
19624
                Population estimates for acid neutralizing capacity (ALK.A11),
                lubregion 4B, Western Lake Survey - Phase I.
                                     29

-------
VARIABLE: ANC AS UEQ/L  FOR LAKESs.2000 HA
    c1:
        0.0
                Xc2: 50.0
Population Size (N): 2379
Lake Area (A):  36065
     Xc3:  200.0
SE(N):  143.3
SE(A):  11314
                                             Sample Size: 143
   1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      -100.0 0.0
Min:   19.05   Q-\


Median:   195.22
Mean:     494.70
Std. Dev.:  567.29
                 100.0   200.0  300.0  400.0   500.0  600.0  700.0   800.0  900.0  1000.0
                 69.06   Q2: 133.50  Q3:  368.63  Q4: 1011.37   Max: 2485.90
PROPORTIONS AND NUMBERS BELOW THE
pc1: 0.000 Ncl: 0 Ncu1: **
pc2: 0.127 Nc2:301 Ncu2: 413
Pc3: 0.507 Nc3: 1205 Ncu3: 1411
VALUE OF Xc
   1.0
   0.6-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      -100.0 0.0   100.0  200.0  300.0  400.0   500.0  600.0  700.0  800.0  900.0  1000,0
Min:   19.05   0^  262.59  02: 541.08   Q3:  1020.92 Q4: 1341.48   Max: 2485.90
Median: 1003.52
 ** Not Defined
    Figure 2-10
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
gc1: 0.000
gc2: 0.037
gc3: 0.185
Acl: 0
Ac2: 1335
Ac3: 6669
Acu1: **
Acu2: 1792
Acu3: 8351
                 Population estimates for acid neutralizing capacity (ALK.A11)
                 subregion 4C, Western Lake Survey - Phase I.
                                       30

-------
VARIABLE: ANC AS UEQ/L FOR LAKESs.2000 HA
    Xc1: 0.0     Xc2: 50.0     Xc3:  200.0
Population Size (N): 2299  SE(N):  83.0        Sample Size:  129
Lake Area (A):  29786      SE(A): 5756
    1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0-
      -100.0 0.0
Min:  -24.00  Q1


Median;   104.87
Mean:     272.79
Std.  Dev.:  601.92
                  100.0  200.0  300.0  400.0  500.0  600.0   700.0  800.0  900.0  1000.0
                 64-72   Q2:  94.00   Q3:  133.65   Q4:  207.15    Max: 4948.60
PROPORTIONS AND NUMBERS BELOW THE VALUE
pc1: 0.006 Nc1: 15 Ncu1: 39
pc2: 0.069 Nc2:158 Ncu2: 240
pc3: 0.778 Nc3: 1788 Ncu3: 1929
OFXC
    1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      -100.0 0.0   100.0  200.0  300.0  400.0  500.0  600.0  700.0   800.0  900.0  10000
Min:  -24.00  0^:  80.86   Q2:  101.52   Q5:  158.41   Q4: 290.11    Max: 4948.60
Median. 139.73
    Figure 2-11
PROPORTIONS AND
<3c1: 0
gc2: 0
9c3' ^
019
049
659
Ac1:
Ac2:
Ac3:
AREA BELOW THE VALUE OF Xc
579
1454
19627
Acu1:
Acu2:
Acu3:
1499
2584
24327
                 Population estimates for acid neutralizing capacity (ALKA11),
                 subregion 4D, Western Lake Survey - Phase I.
                                      31

-------
VARIABLE: ANC AS UEQ/L FOR LAKESs.2000 HA
   Xcl: 0.0     Xc2: 50.0
Population Size (N): 1609  SE(N):
Lake Area (A):  11953      SE(A):
                                ^: 200.0
                                 106.6
                                2983
Sample Size:  139
    1.D-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      -100.0 0.0    100.0  200.0  300.0  400.0   500.0  600.0  700.0  800.0  900.0  1000.0
Min:   18.30  Q-,: 113.89  Q2: 210.96   Q5:  450.03  Q4: 1039.43  Max: 3215.20
Median:   317.01
Mean:     598.44
Std. Dev.: 656.95
PROPORTIONS AND NUMBERS BELOW THE
pc1: 0.000 Nc1: 0 Ncu1: **
pc2: 0.046 Nc2:74 Ncu2: 96
Pc5: 0.394 Nc3: 634 Ncu3: 787
VALUE OF Xc
   1.0-
   0.8-


   0.6
G(X)

   0.4-


   0.2-
   0.0
      -100.0 0.0    100.0  200 0  300.0  400.0   500.0  600.0  700.0  800.0  900.0  1000.0
Min:   18.30  Q^:  179.94  Q2: 428.84  Q3:  441.61   Q4: 981.05   Max: 3215.20
Median: 429.17
 t*  Not  Defined
  Figure 2-12   Population estimates for acid neutralizing capacity (ALKA11),
                subregion 4E, Western Lake Survey - Phase I.
                                      32
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9c1;
9c2:
9c3:
0.000
0.031
0.213
Ac1:
Ac2:
Ac3:
0
374
2540
Acu1:
Acu2;
Acu3:
**
509
3232

-------
VARIABLE: AMMONIUM AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 10393 SE(N):  219.4        Sample Size:  719
Lake Area (A):  181851      SE(A):  27248
    1.0
                                       REGION    4
                                       SUB_RGN
                                       CLASS
   0.8-
   0.6-
   0.2-
   0.0-
       0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:  0.00   0^: 0.00    Q2:  0.00    Qj:  0.05    Q4: 0.53     Max: 14.61


Median:   0.00
Mean:     0.43
Std. Dev.: 1.39
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    2.0    4.0
Min:  0.00   Q-j:  0.00

Median:  0.00
 6.0     8.0    10.0    12.0    14.0    16.0    18.0   20.0
Q2: 0.00     03:  0.00    Q4: 0.44     Max:  14.61
Figure 2-13   Population estimates for ammonium (NH416), region 4, Western
              Lake Survey - Phase I.
                                    33

-------
VARIABLE: AMMONIUM AS UEQ/L  FOR LAKES <.2000 HA

Population Size (N): 2401  SE(N): 74.5        Sample Size: 149
Lake Area (A):  36009     SE(A): 5284
   1.0
                                       REGION    4
                                       SUB_RGN A
                                       CLASS
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    2.0    4.0    6.0    8.0    10.0    12.0    14.0    16.0    18.0   20.0
Min:   0.00   Qj:  0.00    Q2: 0.00     Q3:  0.21     Q4: 0.59     Max:  7.10


Median.   0.00
Mean:     0.31
Std. Dev.: 0.55
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    2.0    4.0
Min:  0.00   Qj:  0.00


Median: 0.00
 6.0     8.0     10.0    12.0    14.0    16.0    18.0   20.0
Q2: 0.00     Q^:  0.05    Q4: 0.74     Max:  7.10
Figure 2-14   Population estimates for ammonium (NH416), subregion 4A,
              Western Lake Survey - Phase I.
                                     34

-------
VARIABLE: AMMONIUM AS UEQ/L FOR LAKES ^2000 HA

Population Size (N): 1706   SE(N):  61.7        Sample Size: 159
Lake Area (A):  68038     SE(A): 23335
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0    6.0    8.0    10.0    12.0    14.0    16.0    18.0   20.0
Min:   0.00   Qj: 0.00    Q2: 0.00     Q3:  0.04    Q4: 0.61     Max:  10.70


Median:   0.00
Mean:     0.48
Std. Dev.: 1.20
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    2.0    4.0
Min:  0.00   Qj:  0.00

Median:  0.00
 6.0     8.0     10.0    12.0     14.0     16.0     18.0    20.0
02: 0.00    03: 0.00    Q4: 0.00     Max:  10.70
  Figure 2-15   Population estimates for  ammonium (NH416), subregion 46,
                Western Lake Survey - Phase I.
                                     35

-------
VARIABLE: AMMONIUM AS UEQ/L FOR LAKES -s.2000 HA

Population Size (N): 2379   SE(N):  143.3       Sample Size: 143
Lake Area (A):  36065      SE(A): 11314
   1.0
                                                                REGION    4
                                                                SUB_RGN  C
                                                                CLASS
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    2.0     4.0
Win:  0.00   Q   0.00
                           6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
                         Q2:  0.00    Q3:  0.04    Q4: 0.44      Max:  12.45
Median:   0.00
Mean:     0.53
Std. Dev.:  1.76
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    2.0     4.0
Min:  0.00   Q-j: 0.00


Median:  0.00
                          6.0    8.0     10.0    12.0     14.0     16.0    18.0    20.0

                          2'- -    Q3:  -    Q4: -44     Max:  12-45
 Figure 2-16   Population estimates for ammonium (NH416), subregion 4C,
               Western Lake Survey - Phase I.
                                    36

-------
  VARIABLE: AMMONIUM AS UEQ/L FOR LAKES s.2000 HA

  Population Size (N): 2299   SE(N):  83.0       Sample Size: 129
  Lake Area (A):  29786      SE(A): 5756
     1.0
     0.8-
     0.6-
     0.4-
     0.2-
     0.0
        0.0   2.0    4.0    6.0    8.0    10.0    12.0    14.0    16.0    18.0    20.0
  Min:  0.00    Q^  0.00    Q2: 0.00     Q3:  0.00    Q4: 0.35     Max:  12.50


  Median:   0.00
  Mean:    0.31
  Std. Dev.: 1.12
     1.0
     0.8-
     0.6-
     0.4-
    0.2-
    0.0
        0.0    2.0     4.0     6.0     8.0     10.0    12.0     14.0     16.0    18.0    20.0
 Min:  0.00   Qj: 0.00    Q- 0.00    Q^: 0.00    Q4: 0.27     Max:  12.50

 Median: 0.00

Figure 2-17   Population estimates for ammonium (NH416), subregion 4D.
              Western Lake Survey - Phase I.
                                        37

-------
  VARIABLE: AMMONIUM AS UEQ/L FOR LAKES s.2000 HA

  Population Size (N): 1609   SE(N):  106.6        Sample Size: 139
  Lake Area (A):  11953      SE(A): 2983
REGION    4
SUB_RGN E
CLASS
      i.o-
     0.8-
     0.6-
     0.4-
     0.2-
     0.0
         0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0   20.0
  Min:  0.00   Q^ 0.00    Q2:  0.00    Q3:  0.18     Q4: 0.58     Max:  14.61
  Median.   0.00
  Mean:     0.60
  Std. Dev.: 2.01
      1.0
     0.8-
     0.6-
     0.4-
     0.2-
     0.0
         0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0   20.0
  Min:   0.00   Qj: 0.00    02:  0.00    Qj:  0.31     Q4: 0.77     Max:  14.61


  Median: 0.00

Figure 2-18   Population estimates  for ammonium (NH416), subregion  4E,
              Western Lake Survey -  Phase I.
                                      38

-------
VARIABLE: LAKE AREA IN HA FOR LAKES s.2000 HA
Population Size (N):  10393 SE(N):  219.4
Lake Area (A):  181851     SE(A): 27248
Sample Size: 719
    1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   O.D
       0.0    10.0    20.0    30.0    40.0    50.0    60.0    70.0    80.0    90.0    100.0
Min:  1.00    Q^ 2.23     Q2: 3.59     Qj:  5.65    Q4: 11.67     Max: 1445.10
Median:   4.60
Mean:     17.50
Std. Dev.: 77.26
    1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0 T '     I        I       I       I       I       I       |       |       |       |
      0.0    10.0    20.0   30.0    40.0    50.0    60.0    70.0    80.0    90.0   100.0
Min:  1.00    Q^  11.97     Q2: 61.05   03: 169.13   Q4: 373.52   Max: 1445.10


Median: 115.65
      Figure 2-19   Population estimates for area, lake (LAKE_SIZ). region 4, Western
                    Lake Survey - Phase I.
                                       39

-------
VARIABLE: LAKE AREA IN HA FOR LAKES s.2000 HA

Population Size (N): 2401   SE(N): 74.5         Sample Size:  149
Lake Area (A):  36009      SE(A): 5284
   1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0-
      0.0   10.0    20.0    30.0    40.0    50.0    60.0    70.0    80.0    90.0    100.0
Min:   1.40    Qj:  2.26    Q2: 3.58    Q^:  6.27    Q4:  12.26     Max: 433.60


Median:    4.63
Mean:     15.00
Std. Dev.: 41.82
   1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      0.0   10.0    20.0    30.0    40.0    50.0    60.0    70.0    80.0    90.0   100.0
Min:  1.40    Qj:  9.40    Q2: 26.03   Q3:  142.25   Q4: 270.27    Max: 433.60


Median:  53.09
       Figure 2-20   Population estimates for area, lake (LAKE_SIZ), subregkm 4A,
                    Western Lake Survey  - Phase I.
                                     40

-------
 VARIABLE: LAKE AREA IN HA  FOR LAKES 
-------
VARIABLE: LAKE AREA IN HA FOR LAKES ^.2000 HA

Population Size (N): 2379  SE(N):  143.3       Sample Size: 143
Lake Area (A):  36065      SE(A): 11314
REGION    4
SUB_RGN  C
CLASS
    1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   o.o-
       0.0   10.0    20.0    30.0    40.0    50.0    60.0    70.0    80.0    90.0   100.0
Min:   1.10    Qj:  2.22    Q2: 3.63    Q3:  5.40    Q4: 8.89      Max: 196.20


Median:   4.62
Mean:     15.16
Std.  Dev.: 38.02
    1.0-
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0-
       0.0   10.0    20.0    30.0    40.0    50.0    60.0    70.0    80.0    90.0   100.0
Min:   1.10    Qj:  8.21     Q2: 76.76    03:  152.43   Q4: 167.99    Max: 196.20


Median: 117.89
    Figure 2-22   Population estimates for area, lake (LAKEJSIZ), subregion 4C,
                 Western Lake Survey - Phase I.
                                      42

-------
 VARIABLE: LAKE AREA IN HA FOR LAKES ^2000 HA

 Population Size (N): 2299  SE(N):  83.0       Sample Size: 129
 Lake Area (A):  29786     SE(A): 5756
REGION   4
SUB_RGN D
CLASS
    1.0
    0.8-
    0.6-
F(X)
    0.4-
    0.2-
   0.0
       0.0    10.0   20.0   30.0    40.0    50.0    60.0    70.0   80.0   90.0   100.0
Min:  1.20    QI: 3.02    Q2: 4.15     Q3:  6.74     Q4: 15.68    Max: 343.40
Median:   5.42
Mean:     12.96
Std. Dev.: 30.91
    1.0
   0.8-


   0.6-
G(X)

   0.4


   0.2-
   0.0
      0.0   10.0    20.0    30.0    40.0   50.0   60.0   70.0    80.0    90.0    100.0
Min:   1.20    Qj:  7.76     Q2: 18.77   Q3: 37.01    Q4: 99.92    Max: 343.40


Median: 24.83
    Figure 2-23   Population estimates for area, lake (LAKE_SIZ), subregion 4D.
                 Western Lake Survey - Phase I.
                                     43

-------
VARIABLE: LAKE AREA IN HA FOR LAKES ^.2000 HA
Population Size (N): 1609   SE(N):  106.6
Lake Area (A):  11953      SE(A):  2983
Sample Size:  139
   1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
       0.0    10.0    20.0   30.0   40.0   50.0   60.0    70.0    80.0    90.0    100.0
Min:   1.00    Q^  1.51     Q2:  3.01     Q3:  4.29    Q4: 7.07      Max: 85.00
Median:   3.46
Mean:     7.43
Std. Dev.: 13.35
    1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      0.0   10.0    20.0    30.0    40.0    50.0    60.0    70.0    80.0    90.0    100.0
Min:   1.00    Qj:  4.59    Q2: 9.86    Q3:  24.87   Q4: 45.60    Max: 85.00
Median: 13.50
    Figure 2-24   Population estimates for area, lake (LAKE_SIZ), subrcgion 4E,
                  Western Lake Survey  Phase I.
                                      44

-------
 VARIABLE: CALCIUM AS UEQ/L  FOR LAKES<.2000 HA
         50.0
Xc2: 100.0
                                Xc3: 150.0
 Population Size (N):  10393 SE(N): 219.4
 Lake Area (A):  181851     SE(A): 27248
                                             Sample Size: 719
    1.D
    0.8-
   0.6-
 F(X)
    0.4-
    0.2-
   0.0-
Min:
       0.0   100.0   200.0   300.0   400.0   500.0   600.0   700.0   800.0   900.0  1000.0
      4.32    Q-,: 42.88    Q2: 71.70    Q3:  125.79   Q4: 354.91   Max: 4755.57
Median:   92.35
Mean:     246.17
Std. Dev.: 414.53
PROPORTIONS AND NUMBERS BELOW THE
pc1: 0.246 Ncl: 2561 Ncu1: 2844
pc2: 0.526 Nc2:5470 Ncu2: 5823
Pc3: 0.660 Nc3: 6857 Ncu3: 7210
VALUE OF Xc
    1.0
   0.8-1

   0.6
G(X)
   0.2-
   0,0
                 /
       0.0   100.0   200.0   300.0   400.0   500.0   600.0   700.0   800.0   900.0  1000.0
Min:  4.32    Q^ 72.05    Q2:  113.90   Q3:  187.60   Q4: 380.36  Max: 4755.57
Median: 182.32
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9c1:
9c2:
9c3:
0.122
0.277
0.466
Ac1:
Ac2:
Ac3:
22132
50408
84799
Acu1:
Acu2:
Acu3:
27383
58270
113069
    Figure 2-25
                  Population estimates for calcium, (CA16), region 4, Western Lake
                  Survey - Phase I.
                                     45

-------
VARIABLE: CALCIUM AS UEQ/L FOR LAKES^.2000 HA
Xc1: 50.0 Xc2: 100.0 Xc3: 150.0
Population Size (N): 2401 SE(N): 74.5 Sample Size: 149
Lake Area (A): 36009 SE(A): 5284



0.8-




0.6-
F(X)
0.4-

0.2-

- ' ' j 	 	












0.0 100.0 200.0 300.0 400.0 500.0 600.0 700.0 800
Min: 6.24 CM: 22.79 Q9: 36.29 Qv 58.91 Ck: 106.11
REGION 4
SUB_RGN A
CLASS














.0 900.0 100
Max: 1693.61
Median:   43.19
Mean:     87.01
Std. Dev.:  136.04
PROPORTIONS AND NUMBERS BELOW THE VALUE OF Xc
Pc1:
Pc2:
Pc3:
0.565
0.795
0.870
NCV
NC2'
NC3'
1357
1909
2090
Ncur
Ncu2:
Ncu3=
1566
2089
2250
   1.0-
   0.8-

   0.6-
G(X)
   0.4-

   0.2-
   0.0
Min:
 0.0   100.0   200.0   300.0   400.0   500.0   600.0  700.0  800.0  900.0   1000.0
6.24   Qj: 31.56    Q2:  51.89    Q3:  125.71   Q4: 205.89   Max: 1693.61
Median: 88.66
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9d:
9c2:
9c3:
0.397
0.538
0.632
ACV
Ac2^
*c3:
14287
19388
22749
AcuV
Acu2:
Acu3:
19191
24360
28790
    Figure 2-26   Population estimates for calcium, (CA16), subregion 4A, Western
                 Lake Survey - Phase I.
                                     46

-------
VARIABLE: CALCIUM AS UEQ/L FOR LAKES^.2000 HA
   Xcl: 50.0    Xc2: 100.0     Xc3:  150.0
Population Size (N): 1706   SE(N):  61.7         Sample Size:  159
Lake Area (A):  68038     SE(A): 23335
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
       0.0   100.0   200.0   300.0   400.0   500.0   600.0   700.0   800.0   900.0  1000.0
Min:   4.32    Q,: 37.27    Q2:  70.78   Q3:  114.36   Q4: 205.96   Max: 1219.68
Median:   95.85
Mean:     147.94
Std. Dev.: 171.94
PROPORTIONS AND NUMBERS BELOW THE
pcl: 0.284 Nc1: 485 Ncul: 578
pc2: 0.533 Nc2:909 Ncu2: 1018
Pc3: 0.702 Nc3: 1197 Ncu3: 1307
VALUE OF Xr
l*f
   1.0
   0.8-
   0.6-
G(X)
   0.4-
   0.2-
   0.0
      0.0   100.0  200.0   300.0  400.0  500.0  600.0  700.0   800.0   900.0  1000.0
Min:  4.32    Qj: 108.91  Q2:  112.87   Q3:  180.72  Q4: 186.23   Max: 1219.68
Median: 156.18
PROPORTIONS
gcl: 0.058
gc2: 0.162
gc3: 0.494
AND AREA BELOW THE
AcV 3954 Acu1"
Ac2: 11004 Acu2:
Ac3: 33634 Acu3
VALUE OF Xc
5380
15295
60794
    Figure 2-27   Population estimates for calcium, (CA16), subregion 4B, Western
                  Lake Survey - Phase I.
                                     47

-------
VARIABLE: CALCIUM AS UEQ/L FOR LAKESs.2000 HA
   Xc1: 50.0    Xc2: 100.0     Xc3:  150.0
Population Size (N): 2379  SE(N): 143.3       Sample Size:  143
Lake Area (A):  36065     SE(A): 11314
   1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0-
      0.0   100.0  200.0  300.0   400.0   500.0   600.0   700.0  800.0  900.0  1000.0
Min:   12.13   Q^. 48.82   Q2: 79.62   Q3:  284.42   Q4: 729.98   Max: 2241.51
Median:   154.17
Mean:     360.96
Std. Dev.: 433.90
PROPORTIONS AND NUMBERS BELOW THE VALUE
pc1: 0.213 Ncl: 506 Ncu1: 649
pc2: 0.434 Nc2: 1033 Ncu2: 1235
pc3: 0.488 Nc3: 1162 Ncu3: 1363
OFXC
0.8-
0.6-
G(X)
0.4-
0.2-
r
/ , 	 r
i i  ' '
^ILj


0.0 100.0 200.0 300.0 400.0 500.0 600.0 700.0 800.0 900.0 1000.0
Min: 12.13 Of. 200.24 Q2: 375.17 Q3: 728.27 Q4: 931.25 Max: 2241.51
PROPORTIONS
Median: 706.01 gc1: 0.073
gc2: 0.155
gc3: 0.176
AND AREA BELOW THE VALUE OF Xc
Ac1: 2617 Acu1: 3615
Ac2: 5604 Acu2: 7244
Ac3: 6355 Acu3: 7998

    Figure 2-28  Population estimates for calcium, (CA16), subregion 4C, Western
                 Lake Survey - Phase I.
                                     48

-------
VARIABLE: CALCIUM AS UEQ/L FOR LAKES^2000 HA
   Xcl: 50.0     Xc2: 100.0     Xc3: 150.0
Population Size (Nl): 2299  SE(N):  83.0       Sample Size: 129
Lake Area (A):  29786      SE(A): 5756
    1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
       0.0   100.0   200.0   300.0   400.0  500.0   600.0  700.0   800.0   900.0   1000.0
Min:  32.18   Qj: 65.36    Q2:  85.26   Q3:  108.69  Q4: 169.33   Max:  1885.12
Median:   92.69
Mean:     182.23
Std. Dev.: 285.70
PROPORTIONS AND NUMBERS BELOW THE
pc1: 0.069 Ncl: 158 Ncul: 240
pc2: 0.543 Nc2:1249 Ncu2: 1409
Pc3: 0.778 Nc5: 1790 Ncu3: 1941
VALUE OF Xc
    1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      0.0   100.0   200.0  300.0  400.0  500.0   600.0   700.0   800.0   900.0   1000 0
Min:   32.18   Q^ 72.02   Q2: 93.21    Q3: 134.89   Q4: 246.58   Max:  1885.12
Median: 107.40
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
gc1: 0.034
gc2: 0.428
gc3: 0.645
Ac1: 1000
Ac2: 12758
Ac3: 19218
Acu1: 1696
Acu2: 16707
Acu3: 23865
   Figure 2-29  Population estimates for calcium (CA16), subregion 4D, Western
                Lake Survey - Phase I.
                                     49

-------
VARIABLE: CALCIUM AS UEQ/L FOR LAKES^2000 HA
        50.0
100.0
             X
Population Size (N): 1609
Lake Area (A):  11953
                                c3:
150.0
        SE(N): 106.6
        SE(A): 2983
        Sample Size: 139
REGION    4
SUB_RGN E
CLASS
   O.D
      0.0   100.0  200.0  300.0   400.0   500.0   600.0  700.0  800.0   900.0   1000.0
Min:  29.99   Q-,: 79.16    Q2- 179.94  Q3:  408.35   Q4: 724.74   Max:  4755.57
Median:   233.14
Mean:     509.51
Std. Dev.:  716.55
PROPORTIONS AND NUMBERS BELOW THE
pc1: 0.034 Nc1: 55 Ncu1: 74
pc2: 0.230 Nc2:370 Ncu2: 486
Pc5: 0.384 Nc3: 618 Ncu3: 772
VALUE OF Xc
   1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      0.0   100.0  200.0  300.0   400.0   500.0   600.0  700.0  800.0   900.0   1000.0
Min:  29.99   Q-j: 141.17    Q2: 401.97  Q3:  414.08   Q4: 720.97   Max:  4755.57
Median: 413.00
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
gc1: 0.023
gc2: 0.138
gc3: 0.238
Ac1: 274
Ac2: 1654
Ac3: 2842
Acu1: 398
Acu2: 2272
Acu3: 3690
    Figure 2-30
Population estimates for calcium, (CA16), subregion 4E, Western
Lake Survey - Phase  I.
                   50

-------
VARIABLE: CHLORIDE AS UEQ/L FOR LAKES ^2000 HA

Population Size (N):  10393 SE(N): 219.4       Sample Size: 719
Lake Area (A):  181851     SE(A): 27248
REGION    4
SUB_RGN
CLASS
    1.D-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    2.0     4.0     6.0    8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:  0.65   Q}: 2.00     Q2: 3.10     Q3:  5.44     Q4: 9.34      Max:  2051.77
Median:   4.11
Mean:     12.50
Std. Dev.: 81.72
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0'
      0.0    2.0     4.0     6.0     8.0     10.0    12.0     14.0     16.0    18.0   20.0
Min:   0.65   Qj: 2.81     Q2: 6.18    Qj:  8.16     Q4: 25.45    Max:  2051.77

Median: 6.70


     Figure 2-30a  Population estimates for chloride, (CL16), region 4, Western Lake
                   Survey - Phase I.
                                      51

-------
VARIABLE: CHLORIDE AS UEQ/L FOR LAKES ^2000 HA

Population Size (N): 2401   SE(N):  74.5         Sample Size:  149
Lake Area (A):  36009     SE(A):  5284
REGION    4
SUB_RGN  A
CLASS
   1.0
   0.8-


   0.6-

1-FOO

   O.4.-


   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.76    Qj: 1.40     Q2:  1.83    Qj:  2.66     Q4:  4.73      Max: 343.70


Median:   2.29
Mean:     4.26
Std. Dev.: 16.71
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0     12.0    14.0    16.0    18.0    20.0
Min:   0.76    Qj: 1.76     Q2:  2.91     03:  5.38     Q4:  8.10      Max: 343.70
Median: 4.39
        Figure 2-30b  Population estimates for chloride, (CL16), subregion 4A, Western
                      Lake Survey - Phase I.

                                     52

-------
VARIABLE: CHLORIDE AS UEQ/L  FOR LAKES s.2000 HA

Population Size (N):  1706  SE(IM): 61.7        Sample Size: 159
Lake Area (A):  68038     SE(A): 23335
REGION    4
SUB_RGN  B
CLASS
    i.o
   0.8-
   0.6-
    0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:  1.13    Q}: 4.02     Q2: 7.55    Q3:  12.95    Q4: 21.56     Max:  142.83


Median:   9.73
Mean:     15.41
Std. Dev.: 17.78
    1 0
   0.8-
   0.6
   0.4-
   0.2-
   0.0
      0 0    2.0     4.0     6.0     8.0    10.0     12.0     14.0     16.0     18.0   20.0
Min:  1.13    Qj:  6.69    Q2:  10.23    Q3:  21.56    Q4: 25.46    Max:  142.83


Median:  17.87

     Figure 2-30c  Population estimates for chloride, (CL16), subregion 4B, Western
                   Lake Survey - Phase I.
                                      53

-------
VARIABLE: CHLORIDE AS UEQ/L FOR LAKES $.2000 HA

Population Size (N): 2379   SE(N):  143.3        Sample Size:  143
Lake Area (A):  36065      SE(A): 11314
REGION    4
SUB_RGN  C
CLASS
   1.0-

   0.8-

   0.6-
1-FOO
   0.4-

   0.2-
   O.D
       0.0    2.0     4.0     6.0     8.0    10.0     12.0     14.0     16.0    18.0    20.0
Min:   0.65   0^: 1.78     Q2:  2.16     Q3:  2.95     Q4: 5.65     Max:  44.77

Median:   2.45
Mean:     5.75
Std. Dev.: 8.82
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:  0.65   Qj: 2.02     Q2: 2.04    Q3:  3.88    Q4: 28.18     Max: 44.77

Median:  3.79

       Figure 2-30d  Population estimates for chloride, (CL16), subregion 4C, Western
                     Lake Survey - Phase I.
                                      54

-------
VARIABLE: CHLORIDE AS UEQ/L FOR LAKES 
-------
VARIABLE: CHLORIDE AS UEQ/L FOR LAKES <.2000 HA

Population Size (N): 1609   SE(N): 106.6       Sample Size: 139
Lake Area (A):  11953      SE(A): 2983
REGION    4
SUB_RGN E
CLASS
    1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   1.24    Q,: 2.17     Q2: 3.32    0.3:  5.60     Q4: 14.43     Max: 177.16


Median:   4.19
Mean:     14.85
Std. Dev.: 31.73
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   1.24    QI: 2.51     Q2: 7.24    Oj: 9.80    Q4: 28.27     Max: 177.16


Median: 9.79
       Figure 2-30f  Population estimates for chloride, (CL16), subregion 4E, Western
                     Lake Survey - Phase I.
                                      56

-------
VARIABLE: COLOR IN PCU FOR LAKES s.2000 HA
Population Size (N): 10393 SE(N):  219.4
Lake Area (A):  181851      SE(A): 27248
Sample Size:  719
REGION     4
SUB_RGN
CLASS
   o.o
       0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0   50.0
Min:  0.00   Qj: 0.00    Q2: 3.99     Qj:  8.14     Q4: 13.44    Max;  110.00
Median:   5.00
Mean:     9.35
Std. Dev.: 10.21
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    5.0    10.0    15.0    20.0    25.0   30.0   35.0   40.0   45.0    50.0
Min:  0.00   Q^  0.00    Q2: 3.02    Q^: 4.98     Q4: 9.52     Max: 110.00

Median:  4.00


    Figure 2-31   Population estimates for color, true (COLVAL) for region 4,
                 Western Lake Survey - Phase I.

                                    57

-------
VARIABLE: COLOR IN PCU FOR LAKES s.2000 HA
Population Size (N): 2401  SE(N): 74.5
Lake Area (A):  36009     SE(A): 5284
   1.0-
Sample Size:  149
REGION    4
SUB_RGN A
CLASS
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    5.0    10.0    15.0    20.0    25.0    30.0   35.0   40.0    45.0    50.0
Min:   0.00   Qj:  0.00    Q2: 0.00    Q3:  0.00    Q4: 3.50     Max: 110.00
Median:   0.00
Mean:     3.16
Std. Dev.: 9.52
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0   40.0   45.0    50.0
Min:   0.00   Qt: 0.00    Q2: 0.00    03:  0.00    Q4: 3.46     Max:  110.00


Median: 0.00
     Figure 2-32   Population estimates for color, true (COLVAL) for region 4A,
                   Western Lake Survey - Phase I.
                                     58

-------
VARIABLE: COLOR IN PCU FOR LAKES s.2000 HA
Population Size (N): 1706  SE(N): 61.7
Lake Area (A):  68038     SE(A): 23335
Sample Size:  159
REGION    4
SUB_RGN B
CLASS
   0.0
       0.0    5.0    10.0    15.0    20.0    25.0   30.0   35.0    40.0    45.0   50.0
Min:   0.00   Qj:  1.10     Q2: 3.60    Q3:  4.89     Q4:  10.10     Max:  55.00
Median:   4.24
Mean:     8.08
Std. Dev.:  8.62
   0.0
      0.0   5.0    10.0    15.0   20.0   25.0    30.0    35.0    40.0    45.0   50.0
Min:  0.00   Q^ 0.00    Q2: 0.00    Q3:  3.76    Q4: 5.78     Max:  55.00


Median:  3.11
       Figure 2-33   Population estimates for color, true (COLVAL) subregion 4B,
                    Western Lake Survey - Phase I.
                                     59

-------
VARIABLE: COLOR IN PCU FOR LAKES ^.2000 HA
Population Size (N): 2379   SE(N):  143.3
Lake Area (A):  36065      SE(A): 11314
Sample Size: 143
REGION    4
SUB_RGN C
CLASS
    i.o-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Win:   0.00   Qj:  4.04    Q2: 6.74     Q3:  8.74    Q4:  12.91     Max: 40.00
Median:   7.95
Mean:     10.32
Std. Dev.: 7.07
   o.o
      0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Min:  0.00   Qj:  4.38    Q: 7.31     Q3:  9.17     Q4:  13.48     Max: 40.00


Median:  8.29


    Figure 2-34   Population estimates for color, true (COLVAL) subregion 4C,
                  Western Lake Survey - Phase I.
                                    60

-------
 VARIABLE: COLOR IN PCU FOR LAKES s.2000 HA
 Population Size (N): 2299  SE(N):  83.0
 Lake Area (A):  29786      SE(A): 5756
Sample Size:  129
REGION    4
SUB_RGN D
CLASS
    1.0
    0.8-
    0.6-
    0.4-
    0.2-
   0.0
       0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0   40.0   45.0    50.0
Win:  0.00   Qj: 3.58    Q2: 7.55     Q3:  9.25     Q4: 17.89    Max: 70.00
Median:   8.40
Mean:     11.94
Std. Dev.; 10.04
   o.o
      0 0    5.0    10.0    15.0    20.0   25.0    30.0    35.0    40.0    45.0    50.0
Min:  0.00   Q^  0.78     02: 4.25    03:  8.35     Q4:  9.92     Max: 70.00

Median:  7.57

     Figure 2-35   Population estimates for color, true (COLVAL) subregion 4D,
                  Western Lake Survey - Phase I.
                                    61

-------
VARIABLE: COLOR IN PCU FOR LAKES s.2000 HA
Population Size (N): 1609   SE(N):  106.6
Lake Area (A):   11953       SE(A):  2983
Sample Size:  139
REGION    4
SUB_RGN  E
CLASS
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    5.0    10.0    15.0    20.0   25.0    30.0    35.0    40.0    45.0    50.0
Min:   0.00   Q-j:  3.65    Q2: 8.69    Q3:  14.06    Q4:  21.64     Max: 65.00
Median:   11.30
Mean:     14.81
Std. Dev.: 11.91
   O.o f      i       i       i       i       i      i	1       I   r      !
       0.0    5.0    10.0    15.0    20.0    25.0   30.0   35.0    40.0    45.0    50.0
Min:  0.00   Qj: 8.07    Q2: 13.21   Q^:  14.53    Q4: 21.66     Max: 65.00


Median: 13.87
     Figure 2-36   Population estimates for color, true (COLVAL) subregion 4E,
                   Western Lake Survey - Phase I.
                                     62

-------
VARIABLE: CONDUCTANCE IN US/CM FOR LAKES s.2000 HA
Population Size (N): 10393 SE(N):  219.4
Lake Area (A):  181851      SE(A): 27248
                                            Sample Size:  719
REGION    4
SUB_RGN
CLASS
   0.0
       0.0    15.0    30.0    45.0    60.0   75.0    90.0    105.0   120.0    135.0   150.0
Min:  1.60    Qj:  8.35    Q2: 13.28   Q3:  20.95   Q4: 48.89    Max: 676.00
Median:
Mean:
Std. Dev.:
          16.51
          37.96
          59.12
    1.0
   0.6-
   0.6-
   0.4-
   0.2-
   0.0
                                                          s:
      0.0   15.0    30.0    +5.0    60.0   75.0    90.0    105.0    120.0   135.0   150.0
Min:  1.60    Q^  13.51    Q2: 29.70   03:  40.22   Q4: 68.68   Max:  676.00

Median:  31.36
 Figure 2-37   Population estimates for conductance (CONDI 1) region 4, Western
              Lake Survey - Phase I.

                                    63

-------
VARIABLE: CONDUCTANCE IN US/CM  FOR LAKES 
-------
VARIABLE: CONDUCTANCE IN US/CM FOR LAKES .2000 HA

Population Size (N): 1706   SE(IM):  61.7        Sample Size:  159
Lake Area (A):  68038     SE(A): 23335
REGION    4
SUB_RGN B
CLASS
   1.0
   0.8-


   0.6-
1-FOO

   0.4-


   0.2-
   0.0
      0.0   15.0    30.0    45.0    60.0    75.0   90.0   105.0   120.0   135.0    150.0
Min:   1.60    Qj:  7.83    Q2: 13.75    Q3: 21.17     Q4: 36.54    Max: 170.90
Median:   18.66
Mean:     25.59
Std. Dev.: 26.53
   1.0
   0.6-j
   0.2-I
   0.0'
      0.0   15.0    30.0    45.0    60.0    75.0   90.0   105.0   120.0    135.0   150.0
Min:  1.60    Q^  23.61    Q^: 29.70    Qj: 40.12    Q4: 40.60    Max: 170.90

Median:  34.74

Figure 2-39   Population estimates for conductance (CONDI 1) subregion 4B,
              Western Lake Survey - Phase I.
                                    65

-------
VARIABLE: CONDUCTANCE IN US/CM FOR LAKES s.2000 HA

Population Size (N): 2379   SE(N):  143.3        Sample Size: 143
Lake Area (A):  36065      SE(A): 11314
   1.0
   0.8H


   0.6-
i-FOO

   0.4-


   0.2-
   0.0-
      0.0   15.0    30.0    45.0    60.0    75.0    90.0    105.0    120.0    135.0   150.0
Min:   3.00   Qj:  8.99    Q2: 15.57    Q3:  39.63   Q4: 108.89   Max:  269.80


Median:   25.12
Mean:     51.78
Std. Dev.: 56.41
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   15.0    30.0    45.0    60.0    75.0    90.0    105.0    120.0    135.0    150.0
Min:   3.00   Q,:  30.45   Q2: 54.87    Q3:  116.79   Q4: 130.52    Max: 269.80

Median: 110.23

  Figure 2-40   Population estimates for conductance (CONDI 1) subregion 4C,
                Western Lake Survey - Phase I.
                                       66

-------
VARIABLE: CONDUCTANCE IN US/CM FOR LAKES s.2000 HA

Population Size (N): 2299  SE(N):  83.0        Sample Size: 129
Lake Area (A):  29786      SE(A):  5756
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   O.D-
       0.0   15.0    30.0   45.0    60.0   75.0   90.0   105.0   120.0   135.0   150.0
Min:   6.75    Qj:  11.31    Q2:  14.29    Q3:  18.17     Q4: 27.15     Max:  676.00
Median:   15.55
Mean:     33.81
Std. Dev.: 68.95
   ro
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   15.0    30.0    45.0    60.0    75.0    90.0   105.0   120.0   135.0   150.0
Min:  6.75    (ty  12.96   Q2: 15.31    Qj:  22.47    Q4: 35.43    Max:  676.00

Median:  18.64

 Figure 2-41   Population estimates for conductance (CONDI 1) subregion 4D,
               Western Lake Survey - Phase I.
                                      67

-------
VARIABLE: CONDUCTANCE IN US/CM FOR LAKES s.2000 HA

Population Size (N):  1609  SE(N): 106.6       Sample Size:  139
Lake Area (A):  11953      SE(A): 2983
REGION   4
SUB_RGN E
CLASS
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0   15.0    30.0    45.0    60.0    75.0   90.0   105.0   120.0   135.0   150.0
Min:   5.70    QI:  14.16    Q2: 24.36   Q3: 56.16    Q4: 104.97   Max: 502.50


Median:    37.06
Mean:     70.38
Std. Dev.: 84.89
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   15.0    30.0    45.0    60.0    75.0   90.0   105.0   120.0   135.0   150.0
Min:   5.70    Q^  21.69    Q2: 55.29    03:  61.24    Q4: 104.98   Max: 502.50

Median. 59.21

 Figure 2-42   Population estimates for conductance (CONDI 1) subregion 4E,
              Western Lake Survey - Phase I.
                                     68

-------
VARIABLE: SITE DEPTH IN M FOR LAKES s.2000 HA

Population Size (N): 10393 SE(N):  219.4        Sample Size:  719
Lake Area (A):  181851     SE(A):  27248
    1.0
                          REGION    4
                          SUB_RGN
                          CLASS
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0-
       0.0      5.0      10.0      15.0
Win:  0.50   Q^ 3.83     Q2:  6.10
  20.0      25.0     30.0
Q3:  10.03   Q4: 17.66
 35.0     40.0
Max: 93.90
Median:   7.83
Mean:     11.96
Std. Dev.: 12.10
    1.0
   0.8-
   0.6-
G(X)

   0.4-
   0.2-
   0.0
      0.0     5.0      10.0      15.0      20.0      25.0     30.0
Min:   0.50   Qj:  10.60   Q2:  19.86    0^:  37.85   Q4: 66.24


Median:  27.62
                            35.0      40.0
                          Max:  93.90
   Figure 2-43   Population estimates for depth, site (SITDPM) region 4, Western
                 Lake Survey - Phase I.
                                     69

-------
VARIABLE: SITE DEPTH IN M FOR LAKES .2000 HA

Population Size (N): 2401   SE(N): 74.5        Sample Size: 149
Lake Area (A):  36009      SE(A): 5284
REGION    4
SUB_RGN  A
CLASS
   1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0,0
       0.0     5.0      10.0     15.0      20.0     25.0      30.0
Min:   1.50    Q^ 4.89    Q2: 7.25     Q3:  11.28    Q4: 19.97
  35.0      40.0
 Max:  89.40
Median:   8.79
Mean:     13.56
Std. Dev.: 13.53
    i o
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0-
      0.0     5.0      10.0     15.0      20.0     25.0      30.0      35.0     40.0
Min:   1.50    Q^ 10.47    Q2: 19.13    Q3: 23.47    Q4: 38.86    Max:  89.40

Median; 20.08


     Figure 2-44   Population estimates for depth, site (SITDPM) region 4A, Western
                   Lake SurveY - Phase I.
                                     70

-------
 VARIABLE: SITE DEPTH IN M FOR LAKES s.2000 HA
 Population Size (N): 1706   SE(N):  61.7
 Lake Area (A):  68038     SE(A): 23335
     Sample Size: 159
    1.0-
    0.8-
    0.6-
 F(X)
    0.4-
    0.2-
   0.0
       0.0      5.0      10.0      15.0
Min:  1.20    0^: 3.31     Q2-  5.71
REGION    4
SUB_RGN  B
CLASS
 20.0     25.0      30.0      35.0     40.0
5:  10.32    Q4: 21.92    Max:  93.90
Median:   7.57
Mean:     14.32
Std. Dev.: 16.98
    1.0


   0.8


   0.6i

GOO
   0.4-


   0.2-
   0.0
                        /
                       y
      0.0     5.0      10.0     15.0      20.0      25.0     30.0     35.0      40.0
Min:   1.20    Q^  24.25    Q2: 41.46    Q3:  68.32   Q4: 77.09     Max: 93.90


Median:  66.36

      Figure 2-45  Population estimates for depth, site (SITDPM) region 4B, Western
                   Lake Survey - Phase I.
                                      71

-------
VARIABLE: SITE DEPTH IN M FOR LAKES s.2000 HA

Population Size (N): 2379  SE(N):  143.3       Sample Size:  143
Lake Area (A):  36065      SE(A): 11314
    1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      0.0     5.0      10.0      15.0
Min:   0.90   Qj: 3.51     Q2: 6.33
                                        20.0      25.0      30.0
                                      Q3:  10.27    Q4: 17.33
                                                                 REGION    4
                                                                 SUB_RGN C
                                                                 CLASS
                                                     35.0      40.0
                                                    Max:  44.80
Median:   8.78
Mean:     11.57
Std. Dev.: 10.18
   1.0


   0.8.


   0.6-
GOO

   0.4-


   0.2-
   0.0
      0.0
Min:  0.90


Median:  19.17
 5.0      10.0      15.0     20.0     25.0      30.0
)t: 11.85    Q2:  15.45    Q3:  26.33   Q4: 37.80
                                                                   35.0     40.0
                                                                 Max: 44.80
    Figure 2-46   Population estimates for depth, site (SITDPM) subregion 4C,
                  Western Lake Survey - Phase I.
                                    72

-------
VARIABLE: SITE DEPTH IN M FOR LAKES 
-------
VARIABLE: SITE DEPTH IN M FOR LAKES s.2000 HA

Population Size (N): 1609   SE(N):  106.6       Sample Size: 139
Lake Area (A):  11953       SE(A): 2983
   1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
       0.0     5.0      10.0      15.0      20.0      25.0     30.0
Win:   1.00    Qj: 2.77    Q2: 4.48     Q3:  5.97    Q4: 10.35
REGION    4
SUB_RGN  E
CLASS
  35.0      40.0
 Max:  40.50
Median:   5.13
Mean:     7.20
Std. Dev.: 6.09
   1.0
   0.8-

   0.6-
G(X)
   0.4-

   0.2-
   0.0
      0.0     5.0      10.0      15.0      20.0      25.0     30.0
Min:   1.00    Q^  4.97    Q2: 6.69     Q3:  13.08   Q4: 25.14

Median: 10.33
  35.0      40.0
 Max:  40.50
       Figure 2-48   Population estimates for depth, site (SITDPM) subregion 4E,
                     Western Lake Survey - Phase I.
                                       74

-------
VARIABLE: DIG IN MG/L  FOR LAKES 
-------
VARIABLE: DIG IN MG/L FOR LAKES s.2000 HA

Population Size (N): 2401   SE(N):  74.5
Lake Area (A):  36009     SE(A): 5284
Sample Size:  149
REGION    4
SUB_RGN  A
CLASS
   1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0-
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.27    QI: 0.50     Q2: 0.77    Q^:  1.11      Q4: 1.88     Max:  37.87


Median:   0.94
Mean:     1.56
Std. Dev.: 2.60
    1 o
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.27    Q^ 0.58     Q2: 1.08    Q3:  2.16     Q4: 4.73      Max:  37.87


Median: 1.36


     Figure 2-50   Population estimates for dissolved inorganic carbon (DICVAL),
                   subregion 4A, Western Lake Survey - Phase I.
                                      76

-------
 VARIABLE: DIG IN MG/L  FOR LAKES <.2000 HA

 Population Size (N): 1706   SE(N): 61.7        Sample Size: 159
 Lake Area (A):  68038     SE(A): 23335
                                        REGION    4
                                        SUB.RGN B
                                        CLASS
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0     14.0     16.0    18.0   20.0
Min:   0.27   QI: 0.85     Q2: 1.44     Qy. 2.36     Q4: 4.05     Max:  19.04
Median:   2.01
Mean:     2.76
Std. Dev.: 2.84
    1.0
   0.8-


   0.6
G(X)

   0.4-J


   0.2-
   0.0
      0.0    2.0     4.0
Min:  0.27    Qj:  2.74
 6-0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Q2: 3.30     Q3:  4.43     Q4: 4.54      Max:  19.04
Median: 3.73
       Figure 2-51   Population estimates for dissolved inorganic carbon (DICVAL),
                     subregion 4B, Western Lake Survey - Phase I.
                                      77

-------
VARIABLE: DIG IN MG/L FOR LAKES ^2000 HA

Population Size (N): 2379  SE(N): 143.3
Lake Area (A):  36065     SE(A): 11314
    1.0-
                    Sample Size: 143
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0-
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.33   QV 1.08     Q2: 1.93     Q3: 4.46     Q4:  12.73     Max: 31.05


Median:   2.77
Mean:     6.27
Std. Dev.: 6.97
   o.o
      0.0    2.0     4.0
Min:  0.33   Q-J: 3.31

Median. 12.62
 6.0    8.0    10.0    12.0     14.0     16.0    18.0    20.0
Q2: 6.51     Q3:  12.87     Q4: 16.53    Max:  31.05
   Figure 2-52   Population estimates for dissolved inorganic carbon (DICVAL),
                 subregion 4C, Western Lake Survey - Phase  I.
                                      78

-------
VARIABLE: DIG IN MG/L FOR LAKES s.2000 HA
Population Size (N): 2299  SE(N):  83.0
Lake Area (A):  29786      SE(A): 5756
                                             Sample Size: 129
REGION    4
SUB_RGN  D
CLASS
    1.0-
   0.8H
   0.6-I
   0.2H
   0.0-
       0.0    2.0     4.0     6.0     8.0     10.0     12.0     14.0    16.0    18.0    20.0
Win:  0.43   Q,: 1.03     Q2:  1.31     Q^:  1.86     Q4: 2.80      Max:  86.72
Median:   1.61
Mean:     3.55
Std. Dev.: 8.48
    1.0
   0.8-

   0.6-
G(X)
   0.4-

   0.2-
   0.0

      0 0    2.0     4.0     6.0     8.0
Min:   0.43   Q^ 1.28     Q2:  1.69
                                        10.0     12.0     14.0     16.0    18.0    20.0
                                        3:  2.18      Q4: 3.40     Max:  86.72
Median: 1.93
    Figure 2-53   Population estimates for dissolved inorganic carbon (DICVAL),
                 subregion 4D, Western Lake Survey - Phase I.
                                     79

-------
VARIABLE: DIG IN MG/L FOR LAKES .2000 HA

Population Size (N): 1609  SE(N):  106.6
Lake Area (A):  11953      SE(A): 2983
Sample Size:  139
REGION    4
SUB_RGN  E
CLASS
    1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
                       ^ J
       0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:  0.30   Q^ 1.45      Q2-  2.69    Q^:  5.47     Q4:  12.04     Max:  35.92
Median:   3.83
Mean:     6.84
Std. Dev.: 7.06
    1.0
   0.8-
   0.6-
G(X)
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.30   Qj: 2.53     Q2:  5.05    03:  5.25     Q4:  11.97     Max: 35.92
Median: 5.10
     Figure 2-54   Population estimates for dissolved inorganic carbon (DICVAL)
                   subregion 4E, Western Lake Survey - Phase I.
                                      80

-------
VARIABLE: DOC AS MG/L FOR LAKES^2000 HA
   Xc1:  2.0
                Xc2: 3.0
:  6.0
Population Size (N): 10393  SE(N): 219.4
Lake Area (A):  181851      SE(A): 27248
                                           Sample Size: 719
   ro
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      0.0    1.0     2.0     3.0    4.0
Min:   0.06    Q}: 0.64    Q2: 1.01
                                       5.0    6.0     7.0    8.0    9.0    10.0
                                       :  1.54     Q4: 2.76      Max:  16.72
Median:   1.21
Mean:    1.93
Std. Dev.: 2.01
                     PROPORTIONS AND NUMBERS BELOW THE VALUE OF Xc
                    pc1:  0.697  Nc1: 7239   Ncu1:  7642
                    pc2:  0.820  Nc2:8521    Ncu2:  8915
                    pc3: 0.946  Nc3: 9830   Ncu3:  10206
   0.0
      0.0
Min:  0.06


Median:  1.01
            1.0     2.0    3.0     4.0    5.0     6.0     7.0    8.0    9.0    10.0
            Q^ 0.60    Q2: 0.96    03: 1.27     Q4: 2.40     Max:  16.72
                    PROPORTIONS AND AREA BELOW THE VALUE OF Xc
                    gc1:   0.777    Ac1:  141309    Acu1:  183389
                    gc2:   0.846    Ac2:  153844    Acu2: 196163
                          0.976    Ac3:  177466    Acu3: 222283
   Figure 2-55   Population estimates for dissolved organic carbon (DOC 11), region
                 4, Western Lake Survey - Phase I.
                                    81

-------
VARIABLE: DOC AS MG/L FOR LAKESs.2000 HA
   Xcl:  2.0      Xc2:  3.0       Xc3: 6.0
Population Size (N): 2401   SE(N): 74.5        Sample Size: 149
Lake Area (A):  36009     SE(A): 5284
   1.D-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   O.D
      0.0
Min:  0.20
            1.0     2.0     3.0    4.0    5.0     6.0    7.0    8.0     9.0    10.0
            Q^ 0.46    Q2:  0.70     Q3: 1.27      Q4: 1.93     Max:  10.76
Median:   0.97
Mean:     1.41
Std. Dev.:  1.43
                     PROPORTIONS AND NUMBERS BELOW THE VALUE OF Xc
                    pc1:  0.807  Nc1:  1937    Ncu1:  2105
                    pc2:  0.921   Nc2:2212    Ncu2:  2354
                    pc3: 0.970  Nc3: 2330   Ncu3:  2463
   1.0
   0.8-


   0.6-
GOO
   0.4-


   0.2-
   0.0'
      0.0    1.0     2.0     3.0    4.0    5.0     6.0    7.0    8.0     9.0    10.0
Min:  0.20   Q-J: 0.43    Q2: 0.92     Q3: 1.13      Q4:  1.48     Max:  10.76
Median:  1.04
                     PROPORTIONS AND AREA BELOW THE VALUE OF X
                      ^:  0.937   Ac1:  33728     Acu1:  42462
                    gc2:  0.983   Ac2:  35397     Acu2:  44114
                    gc3:  0.996   Ac3:  35852     Acu3:  44552
Figure 2-56   Population estimates  for dissolved  organic carbon (DOC 11),
              subregion 4A, Western Lake Survey  - Phase I.
                                    82

-------
VARIABLE: DOC AS MG/L FOR LAKES^2000 HA
   Xc1: 2.0     Xc2: 3.0       Xc3:  6.0
Population Size (N): 1706  SE(N): 61.7        Sample Size: 159
Lake Area (A):  68038     SE(A): 23335
   o.o
      0.0    1.0     2.0     3.0     4.0     5.0     6.0    7.0     8.0     9.0    10.0
Win:   0.06    Q-,: 0.52     Q2: 1.04    Q3:  1.57     Q4: 2.57     Max: 7.22
Median:   1.30
Mean:     1.72
Std. Dev.:  1.51
                     PROPORTIONS AND NUMBERS BELOW THE VALUE OF X(
                    pc1: 0.681   Nc1: 1161     Ncul:  1277
                    pc2: 0.868   Nc2:1480    Ncu2:  1591
                    Pc3: 0.973   Nc3: 1661    Ncu3:  1765
   1.0
   0.8-
   0.6-
G(X)

   0.4-
   0.2-
   0.0-
      0.0    1.0     2.0
Min:  0.06   Q  0.59
                          3.0     4.0    5.0    6.0    7.0     8.0     9.0    10.0
                         Q2:  0.94    Q3:  0.96    Q4: 1.30     Max: 7.22
Median:  0.95
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9c1:
9c2:
9c3:
0.880
0.973
0.997
Ac1:
^c2-
Ac3:
59873
66213
67824
Acu1:
Acu2:
Acu3:
98049
104644
106218
    Figure 2-57   Population  estimates for dissolved organic carbon (DOC 11),
                  subregion 46, Western Lake Survey - Phase I.
                                     83

-------
VARIABLE: DOC AS MG/L FOR LAKESs.2000 HA
   Xc1:  2.0      Xc2: 3.0      Xc3:  6.0
Population Size (N):  2379  SE(N):  143.3       Sample Size:  143
Lake Area (A):  36065     SE(A): 11314
   1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0    9.0    10.0
Min:  0.22    0^:  0.75     Q2: 1.01     Q3:  1.60     Q4: 2.63      Max:  10.43
Median:   1.20
Mean:     2.12
Std. Dev.:  2.28
 PROPORTIONS AND NUMBERS BELOW THE VALUE OF Xc
pc1: 0.708  Nc1: 1685    Ncul:  1929
pc2: 0.808  Nc2:1921    Ncu2: 2167
Pc3: 0.918  Nc3: 2183    Ncu3: 2426
   1.0-
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      0.0    1.0    2.0     3.0     4.0     5.0     6.0     7.0     8.0    9.0    10.0
Min:  0.22    Q^.  0.67     Q2: 1.00    Q3:  4.32     Q4: 4.82      Max: 10.43
Median: 1.91
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
gc1: 0.511
gc2: 0.552
gc3: 0.961
Acl: 18427
Ac2: 19891
Ac3: 34642
Acu1: 29879
Acu2: 31342
Acu3: 53310
Figure 2-58   Population estimates for dissolved  organic  carbon (DOC 11),
              subregion 4C, Western Lake Survey  - Phase I.
                                     84

-------
VARIABLE: DOC AS MG/L FOR LAKESs.2000 HA
   Xc1: 2.0     Xc2: 3.0      Xc3: 6.0
Population Size (N):  2299  SE(N):  83.0       Sample Size: 129
Lake Area (A):  29786     SE(A): 5756
    1.D
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0-
      0.0    1.0    2.0     3.0     4.0    5.0     6.0     7.0     8.0    9.0    10.0
Min:   0.25    Q^  0.68     Q2:  1.03     Q3: 1.57     Q4: 3.23     Max: 16.72
Median:   1.25
Mean:     2.09
Std. Dev.:  2.31
                     PROPORTIONS AND NUMBERS BELOW THE VALUE OF Xc
                    pcl: 0.673  Nc1: 1548   Ncu1: 1717
                    pc2: 0.777  Nc2:1787   Ncu2: 1953
                    Pc3: 0.960  Nc3: 2206   Ncu3: 2345
   i.o
   0.8-
   0.6i
G(X)
   0.4-
   0.2-
   0.0'
      0.0    1.0
                          3.0
                                4.0     5.0
                                              6.0
                                                           8.0
                                                                  9.0     10.0
Min:
   i:  0.25

Median:  1.38
              f. 0.61
                  J.V    D.(J     / ,\J
    Q2:  1.23     Q2:  1.42     Q4: 2.27     Max: 16.72

PROPORTIONS AND AREA	
n .  n 779    A .-  9^n
                     gc1:  0.772
                     gc2:  0.848
                     gc3:  0.966
                                            *      **tL *  ^*^ f      IVI \J/V

                                            BELOW THE VALUE OF Xc
                                            35    Acul:  32426
                                     :  25246     Acu2: 34716
                                      :  28760     Acu3: 38218
                              \Q
Ac1:  23005
     Figure 2-59   Population estimates for dissolved organic carbon (DOC11),
                  subregion 4D, Western Lake Survey - Phase I.
                                     85

-------
VARIABLE: DOC AS MG/L FOR LAKES^2000 HA
        2.0
   Xc2: 3.0
Population Size (N): 1609
Lake Area (A):  11953
     Xc3: 6.0
SE(N):  106.6
SE(A): 2983
                              Sample Size:  139
   1.D-I-
   0.8H
F(X)
   0.4H
   0.2H
   O.D-
      0.0    1.0     2.0     3.0    4.0     5.0     6.0    7.0     8.0     9.0    10.0
Min:  0.29    Q^ 0.82    Q2: 1-19      Q3:  2.20    Q4: 3.72     Max:  11.33
Median:   1.48
Mean:     2.44
Std. Dev.:  2.14
                     PROPORTIONS AND NUMBERS BELOW THE VALUE OF X,
        pcl: 0.565   Ncl: 908
        pc2: 0.697   Nc2:1121
        pc5: 0.902   Nc3: 1450
                   Ncu1: 1087
                   Ncu2: 1309
                   Ncu3: 1635
   1.0-
   o.6-\
G(X)
   0.2-\
   0.0
      0.0
Min:  0.29


Median:  1.55
1.0    2.0    3.0     4.0    5.0    6.0     7.0    8.0    9.0     10.0
Qi:  1.17      Q2: 1.53     Q3:  3.02    Q4: 3.96     Max:  11.33
        PROPORTIONS AND AREA BELOW THE VALUE OF X<
        gc1:   0.525    Acl:  6276      Acu1:  10417
        gc2:   0.594    Ac2:  7098      Acu2: 11230
        gc3:   0.869    Ac3:  10387     Acu3: 14957
  Figure 2-60   Population estimates for dissolved organic  carbon (DOC 11),
               subregion 4E, Western Lake Survey - Phase I.
                                    86

-------
VARIABLE: DOC AS MG/L FOR LAKES^.2000 HA
   Xcl:  2.0     Xc2: 3.0       Xc3:  6.0
Population Size (N): 10393 SE(N): 219.4        Sample Size:  719
Lake Area (A):  181851     SE(A): 27248
   1.0
   0.8-


   0.6-
1-F00

   0.4-


   0.2-
   0.0-
      0.0    1.0     2.0    3.0     4.0     5.0    6.0     7.0     8.0    9.0    10.0
Min:   0.06   Q-J: 0.64    Q9: 1.01     Qv  1.54     QA: 2.76      Max:  16.72
Median:   1.21
Mean:     1.93
Std. Dev.:  2.01
     W2:  i.u i      ^3:  '-^^

 PROPORTIONS AND NUMBERS ABOVE THE VALUE OF X
pcl:  0.305  Nc1:  3174    Ncul:  3533
pc2:  0.180  Nc2:1872    Ncu2:  2176
   : 0.054  N: 563    N:  753
   o.o
      0.0
Min:  0.06

Median:  1.01
                     1.27     Q4: 2.40     Max: 16.72
    02:  0.96    Q^: 1.27     Q4: 2.40

PROPORTIONS AND AREA ABOVE THE VALUE
n.,-  099^   A_.-  ADfi9n     A    S7S7
 gcl:  0.223   Ac1: 40620    Acul:  57577
 gc2:  0.154   Ac2: 28007    Acu2:  43765
 gc3:  0.024   Ac3: 4385     Acu3:  6961
  Figure 2-61   Population estimates for dissolved organic carbon (DOC 11), region
               4, Western Lake Survey - Phase I.
                                    87

-------
VARIABLE: DOC AS MG/L  FOR LAKES^.2000 HA
   XC1:  2.0
   Xc2: 3.0
          X~T: 6.0
Population Size (N): 2401   SE(N): 74.5
Lake Area (A):  36009     SE(A): 5284
                               Sample Size: 149
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    1.0     2.0    3.0    4.0     5.0     6.0    7.0     8.0     9.0    10.0
Min:  0.20   Q-): 0.46    Q2- 0.70    Q3:  1.27     Q4: 1.93     Max:  10.76
Median:   0.97
Mean:    1.41
Std. Dev.: 1.43
            Uo: u./u    w?:  i.z/
             ^.            j
        PROPORTIONS AND NUMBERS ABOVE THE VALUE OF Xc
        pc1: 0.197   Nc1: 472     Ncu1:  607
        Pc2: 0.079   Nc2:189     Ncu2:  274
        pr3: 0.030  Nr-$: 71      Nr,,T:  129
        '{**J          \~,^J          l^UO
   ro
   0.6-
   0.6-
   0.4-
   0.2-
   o.o-
      0.0    1.0
Min:  0.20

Median:  1.04
1.0     2.0    3.0     4.0     5.0    6.0    7.0
QI: 0.43    Q2: 0.92    03:  1.13     Q4: 1.48
                                                           8.0
                                                                  9.0    10.0
;     w2.  u.^z     W3-  i.l3     0.4: 1.48      Max: 10.76
 PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
 gc1:  0.064    Ac1:  232?      *      *"*
 gc2:  0.017   Ac2:  612
 9c3:  -004
        PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
        gc1:   0.064   Ac1:  2322      Acul:  3415
        gc2:   0.017    Ac2:  612       Acu2:  861
        n ,.   nonA   A 3:  156       ACU3:  276
   Figure 2-62  Population estimates for dissolved  organic -carbon  (DOC 11),
                subregion 4A. Western Lake Survey - Phase I.

-------
VARIABLE: DOC AS MG/L FOR LAKESs.2000 HA
   Xcl:  2.0      Xc2: 3.0       Xc3: 6.0
Population Size (N): 1706   SE(N): 61.7
Lake Area (A):  68038     SE(A): 23335
                                           Sample Size:  159
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   O.D
       0.0    1.0    2.0     3.0    4.0    5.0     6.0     7.0    8.0    9.0     10.0
Min:   0.06   Q-|:  0.52     Q2:  1.04     Q3: 1.57      Q4: 2.57      Max:  7.22
Median:   1.30
Mean:     1.72
Std. Dev.: 1.51
   1.0
                     PROPORTIONS AND NUMBERS ABOVE THE VALUE OF Xc
                    pc1:  0.319   Ncl: 544     Ncul:  648
                    pc2:  0.132   Nc2:226     Ncu2:  300
                    pc3:  0.027   Nc3:45      Ncu3:  80
   0.6-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   1.0     2.0     3.0    4.0     5.0     6.0    7.0     8.0     9.0    10.0
Min:  0.06   Q-J: 0.59    Q2: 0.94    Q3:  0.96    Q4: 1.30     Max: 7.22
Median: 0.95
                    PROPORTIONS AND AREA ABOVE THE VALUE OF X(
                    gc1:   0.120    Acl:  8166      Acu1:   14316
                    gc2:   0.027    Ac2:  1826      Acu2:  2972
                       <:   0.003   Ac3:  214       Acu3:  400
  Figure 2-63   Population estimates for dissolved organic carbon (DOC 11),
                subregion 4B, Western Lake Survey - Phase I.
                                    89

-------
VARIABLE: DOC AS MG/L FOR LAKES
-------
VARIABLE: DOC AS MG/L FOR LAKESs.2000 HA
   Xc1: 2.0
Xc2: 3.0
6.0
Population Size (N): 2299  SE(N):  83.0
Lake Area (A):  29786     SE(A):  5756
                           Sample Size:  129
    1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    1.0    2.0     3.0     4.0    5.0     6.0     7.0    8.0    9.0    10.0
Min:   0.25    QI:  0.68    Q2:  1.03    Qy. 1.57     Q4: 3.23      Max:  16.72
Median:   1.25
Mean:     2.09
Std. Dev.:  2.31
                     PROPORTIONS AND NUMBERS ABOVE THE VALUE OF X,
    pcl: 0.327  Nc1: 751
    pc2: 0.223  Nc2:512
    Pc3: 0.040  Nc3: 93
         Ncu1:  903
         Ncu2:  647
         Ncu3:  152
    ro
   0.8
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    1.0
                   2.0
                          3.0    4.0    5.0
                                              6.0
                                                    7.0     8.0     9.0    10.0
Min:  0.25    Qj: 0.61    Q2:  1.23     Q3: 1.42    Q4: 2.27     Max: 16.72
Median:  1.38
     PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
     gcl:  0.228   Ac1:  6781       Acul:  8956
     gc2:  0.152   Ac2:  4540      Acu2:  6308
     gc3:  0.034   Ac3:  1025       Acu3: 2065
    Figure 2-65   Population estimates  for dissolved organic carbon (DOC11),
                 subregion 4D, Western Lake Survey - Phase I.
                                   91

-------
VARIABLE: DOC AS MG/L FOR LAKES<.2000 HA
   Xc1:  2.0      Xc2: 3.0      Xc3:  6.0
Population Size (N): 1609  SE(N):  106.6       Sample Size: 139
Lake Area (A):  11953      SE(A):  2983
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    1.0     2.0     3.0     4.0     5.0     6.0    7.0    8.0     9.0    10.0
Min:  0.29    Q-j: 0.82    Q2: 1.19     Q3:  2.20    Q4:  3.72     Max:  11.33
Median:   1.48
Mean:     2.44
Std. Dev.:  2.14
 PROPORTIONS AND NUMBERS ABOVE THE VALUE OF X(
pc1:  0.435  Nc1: 700    Ncu1:  881
pc2:  0.303  Nc2: 488    Ncu2:  652
pc3: 0.098  Nc3: 158     Ncu3:  263
   1.0
   0.6-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    1.0     2.0     3.0     4.0     5.0     6.0    7.0    8.0     9.0
Min:  0.29    Qf. 1.17      Q2: 1.53     Q3:  3.02     Q4:  3.96      Max:  11.
                                                     10.0
Median:  1.55
PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
9d:
9c2:
9c3:
0.475
0.406
0.131
Ac1:
Ac2:
AC3'
5677
4855
1566
AcuV
Acu2:
Acu3:
8714
7903
3660
  Figure 2-66   Population estimates  for  dissolved organic carbon (DOC 11),
               subregion 4E, Western Lake Survey - Phase I.
                                     92

-------
VARIABLE: ELEVATION IN M  FOR LAKES s.2000 HA
Population Size (N): 10393 SE(N):  219.4
Lake Area (A):  181851     SE(A):  27248
Sample Size:  719
    ro
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    500.0    1000.0    1500.0   2000.0    2500.0   3000.0   3500.0   4000.0
Min:   10.67   QI: 1746.33 Q2:  2305.35 Q^:  2906.73 Q4: 3236.79  Max:  3885.33


Median:   2613.14
Mean:     2466.54
Std. Dev.: 842.55
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0'
      0.0    500.0    1000.0   1500.0    2000.0   2500.0   3000.0    3500.0   4000.0
Min:  10.67   (ty  632.45  Q2: 1466.74  Q5:  1985.21  Q4: 2816.94   Max:  3885.33


Median:  1512.38
    Figure 2-67   Population estimates for elevation, lake (ELEV), region 4, Western
                  Lake Survey -  Phase I.
                                      93

-------
VARIABLE: ELEVATION IN M FOR LAKES s.2000 HA

Population Size (N): 2401  SE(N): 74.5        Sample Size:  149
Lake Area (A):  36009     SE(A): 5284
   O.D
      0.0    500.0    1000.0    1500.0    2000.0   2500.0    3000.0   3500.0   4000.0
Min:  262.27  Q^  2135.90 Q2: 2742.62  Q^: 3134.40  Q4: 3330.28 Max:  3714.55


Median:    3008.53
Mean:     2810.66
Std. Dev.: 617.79
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    500.0    1000.0    1500.0   2000.0   2500.0    3000.0   3500.0   4000.0
Min:  262.27  Qj:  1669.98 Q2: 2022.02  Q3: 2455.79  Q4: 3115.34  Max: 3714.55


Median:  2123.66
      Figure 2-68   Population estimates for elevation, lake (ELEV), subregion 4A,
                    Western Lake Survey - Phase I.
                                    94

-------
VARIABLE: ELEVATION IN M FOR LAKES 
-------
VARIABLE: ELEVATION IN M FOR LAKES i.2000 HA

Population Size (N): 2379   SE(N):  143.3       Sample Size: 143
Lake Area (A):  36065      SE(A): 11314
    1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    500.0    1000.0   1500.0    2000.0   2500.0   3000.0    3500.0   4000.0
Min:   180.54 Qj: 1660.12 Q2: 1960.87  Q5: 2224.11  Q4: 2453.92   Max:  2775.24


Median:   2063.73
Mean:     1988.89
Std. Dev.: 546.61
    1.0
   o.e-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    500.0    1000.0   1500.0    2000.0   2500.0   3000.0    3500.0   4000.0
Min:   180.54 Q^  1028.54 Q2: 1118.89  Q3: 1229.33  Q4: 1931.39   Max:  2775.24


Median:  1228.62
     Figure 2-70   Population estimates for elevation, lake (ELEV), subregion 4C,
                  Western Lake Survey   Phase I.
                                       96

-------
 VARIABLE: ELEVATION IN M  FOR LAKES <.2000 HA
Population Size (N): 2299  SE(N):  83.0
Lake Area (A):  29786      SE(A): 5756
                                            Sample Size: 129
    1.0-
   0.8-
   0.6-
    0.4-
   0.2-
   0.0
       0.0     500.0    1000.0    1500.0    2000.0    2500.0   3000.0   3500.0    4000.0
Min:  1970.11 Q-\: 2803.76 Q2:  2975.75  Qj:  3110.48 Q4: 3255.26  Max: 3552.91
Median:
Mean:
Std. Dev.:
          3039.66
          2993.54
          327.78
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    500.0    1000.0   1500.0    2000.0   2500.0   3000.0    3500.0   4000.0
Min:   1970.11  QJ:  2336.41 Q2: 2755.18  Q3:  3038.27 Q4: 3232.84  Max:  3552.91
Median: 2961.90
      Figure 2-71   Population estimates for elevation, lake (ELEV), lubrcgion 4D,
                   Western Lake Survey - Phase I.
                                      97

-------
VARIABLE: ELEVATION IN M FOR LAKES s.2000 HA

Population Size (N): 1609  SE(N): 106.6       Sample Size:  139
Lake Area (A):  11953      SE(A): 2983
   1.D-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    500.0   1000.0    1500.0   2000.0   2500.0   3000.0   3500.0    4000.0
Win:  2104.300!=  2659.15 Q2: 3138.96 Q3:  3368.86 Q4: 3552.23  Max: 3885.33


Median:    3264.16
Mean:     3164.66
Std. Dev.: 468.14
   1.0'
   o.e-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    500.0   1000.0    1500.0    2000.0   2500.0   3000.0   3500.0    4000.0
Min:  2104.300.!:  2430.86 Q2: 2840.21 Q3:  3024.84 Q4: 3394.07  Max: 3885.33

Median:  2845.14


   Figure 2-72   Population estimates for elevation, lake (ELEV), subregion 4E,
                Western Lake Survey - Phase I.
                                     98

-------
 VARIABLE: FLUORIDE AS UEQ/L FOR LAKES s.2000 HA

 Population Size (N): 10393 SE(N):  219.4        Sample Size:  719
 Lake Area (A):  181851     SE(A):  27248
REGION   4
SUB_RGN
CLASS
    1-w
    0.8-
    0.6-
    0.4-
    0.2-
    0.0
       0.0    1.0     2.0     3.0     4.0     5.0     6.0    7.0    8.0    9.0    10.0
 Min:  0.00   Q}: 0.42     Q2:  0.66    Q3:  1.05     04: 2.44      Max: 181.61
 Median:   0.82
 Mean:    3.23
 Std. Dev.: 11.09
    1.0
   o.e-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    1.0     2.0     3.0     4.0    5.0    6.0    7.0    8.0    9.0    10.0
Min:  0.00   Qf 0.58    Q2-  1-03    Q3:  1.34     Q4: 2.06      Max: 181.51


Median: 1.31

Figure 2-73   Population estimates for fluoride (FTL16), region 4, Western Lake
              Survey - Phase I.
                                     99

-------
VARIABLE: FLUORIDE AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2401   SE(N): 74.5        Sample Size: 149
Lake Area (A):  36009     SE(A): 5284
REGION    4
SUB_RGN  A
CLASS
       0.0    1.0     2.0     3.0    4.0    5.0    6.0     7.0     8.0     9.0     10.0
Min:  0.09   C^: 0.31    Q2: 0.45     Q3:  0.71     Q4: 1.09     Max: 9.02


Median:   0.56
Mean:    0.96
Std. Dev.: 1.15
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0        i       i       i       i - 1 - 1 - 1       i       i       i
      0.0    1.0     2.0    3.0    4.0    5.0     6.0     7.0     8.0     9.0    10.0
Win:  0.09   Qj: 0.32    Q2: 0.60     Q3: 0.71     Q4: 1.03     Max: 9.02


Median: 0.62


  Figure 2-74   Population estimates for fluoride (FTL 1 6), subregion 4 A, Western
                Lake Survey - Phase I.
                                      100

-------
VARIABLE: FLUORIDE AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 1706   SE(N):  61.7         Sample Size:  159
Lake Area (A):  68038     SE(A):  23335
                                                    REGION    4
                                                    SUB_RGN B
                                                    CLASS
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   O.D
       0.0    1.0     2.0     3.0     4.0     5.0     6.0    7.0    8.0    9.0    10.0
Min:   0.11    Qj: 0.32    Q2'-  0.48    Q3:  0.73    Q4: 1.02      Max:  15.15


Median:   0.59
Mean:     0.88
Std Dev.: 1.39
   1.0
   o.e
   0.4-
   0.2-
   0.0
      0.0
Min:   0.11


Median: 1.32
1.0     2.0     3.0     4.0
Qj: 0.73    Q2:  1.29
                                        5.0    6.0     7.0     8.0     9.0    10.0
                                        :  1.49     Q4: 1.52      Max:  15.15
   Figure 2-75   Population estimates for fluoride (FTL16), subregion 4B, Western
                Lake Survey - Phase I.
                                     101

-------
VARIABLE: FLUORIDE AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2379  SE(N): 143.3        Sample Size:  143
Lake Area (A):  36065     SE(A): 11314
    1.D
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
                                                       i	^
       0.0    1.0     2.0     3.0     4.0    5.0     6.0    7.0     8.0     9.0    10.0
Win:  0.17    Q^ 0.48     Q2: 0.78     Qy  1.31     Q4: 4.37      Max: 73.46
Median:   0.94
Mean:     4.04
Std. Dev.: 8.89
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0
Min:   0.17


Median: 1.28
1.0     2.0     3.0     4.0     5.0     5.0    7.0    8.0    9.0    10.0
Qj: 0.77     Q2: 1.04     Q^: 1.31     Q4: 6.38     Max: 73.46
Figure 2-76   Population estimates for fluoride (FTL16), subregion 4C, Western
              Lake Survey - Phase I.
                                      102

-------
VARIABLE: FLUORIDE AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2299  SE(N):  83.0        Sample Size:  129
Lake Area (A):  29786      SE(A): 5756
REGION   4
SUB_RGN D
CLASS
    1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0     9.0    10.0
Min:   0.00   Qj: 0.49    Q2:  0.67    Q^:  0.95     Q4: 1.57      Max: 181.61
Median:   0.79
Mean:     2.92
Std. Dev.: 16.14
   o.o
      0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0    9.0    10.0
Min:  0.00   Qj: 0.47    Q2:  0.75    03:  1.55      Q4: 2.42      Max: 181.61


Median: 0.93

   Figure 2-77   Population estimates for fluoride (FTL16), subregion 4D, Western
                Lake Survey - Phase I.
                                     103

-------
VARIABLE: FLUORIDE AS UEQ/L FOR LAKES .2000 HA

Population Size (N): 1609   SE(N):  106.6       Sample Size:  139
Lake Area (A):  11953      SE(A):  2983
REGION    4
SUB_RGN  E
CLASS
    1.0-
   0.6-
   0.6-
    0.4-
   0.2-
   0.0-
       0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0     9.0    10.0
Min:  0.00   (ty 1.18     Q2: 2.04    Q3:  3.59     Q4: 9.02     Max: 72.71


Median:   3.20
Mean:    8.36
Std. Dev.: 16.13
    to
   0.6-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    1.0     2.0     3.0    4.0    S.O     6.0    7.0    8.0    9.0    10.0
Min:   0.00   Q^ 1.73     Q2: 4-.19     03:  23.74   Q4:  33.54    Max: 72.71


Median: 8.88
   Figure 2-78   Population estimates for fluoride (FTL16), subregion 4E, Western
                Lake Survey - Phase I.
                                      104

-------
 VARIABLE: IRON IN UG/L FOR LAKES .2000 HA

 Population Size (N): 10393 SE(N): 219.4
 Lake Area  (A):  181851     SE(A): 27248
Sample Size: 719
REGION    4
SUB_RGN
CLASS
    1.0-
    0.8-
   0.6-
   0.4-
    0.2-
   0.0
       0.0    20.0   40.0    60.0    80.0   100.0   120.0    140.0   160.0   180.0   200.0
Min:  0.00   Q^ 4.15     Q2: 9.91     Q3: 17.84    Q4: 43.08    Max:  974.00
Median:   13.71
Mean:     37.45
Std. Dev.: 76.94
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0   20.0    40.0    60.0   80.0   100.0   120.0   140.0   160.0   180.0   200.0
Min:   0.00   Qj:  2.63    Q2:  8.96    Q3:  14.94    Q4: 36.45    Max: 974.00
Median: 10.45
 Figure 2-79  Population estimates for iron (FEU), region 4, Western Lake
              Survey - Phase I.
                                     105

-------
VARIABLE: IRON IN UG/L  FOR LAKES 
-------
 VARIABLE: IRON IN UG/L FOR LAKES s.2000 HA

 Population Size (N): 1706  SE(N): 61.7        Sample Size:  159
 Lake Area (A):  68038     SE(A): 23335
    1.0
    0.8-


    0.6-
 1-F0C)

    0.4-


    0.2-
    0.0
       0.0    20.0    40.0    60.0    80.0   100.0   120.0    140.0    160.0    180.0  200.0
 Win:  0.00    Qj: 5.03     Q2: 11.95    Q3: 19.72    Q4: 36.08   Max: 673.00
 Median:    15.69
 Mean:     44.10
 Std. Dev.:  97.25
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0   20.0   40.0    60.0    80.0    100.0   120.0   140.0   160.0   180.0   200.0
Min:   0.00   Q^ 0.88    Q2: 10.01    Q3:  10.41     Q4: 20.14    Max:  673.00

Median: 10.21

 Figure 2-81   Population estimates for iron (FEH),subregion4B, Western Lake
               Survey - Phase I.
                                      107

-------
VARIABLE: I RON IN UG/L  FOR LAKES ^2000 HA

Population Size (N): 2379  SE(N):  143.3
Lake Area (A):  36065      SE(A): 11314
Sample Size:  143
REGION    4
SUB_RGN  C
CLASS
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   O.D
       0.0   20.0    40.0    60.0    80.0    100.0   120.0    140.0   160.0   180.0   200.0
Min:   0.00   Q-,:  4.58    Q2: 7.92     Q3:  13.66    Q4: 28.28    Max:  373.00
Median:   9.68
Mean:     34.45
Std. Dev.: 75.57
   1.0
   0.6-
   0.6-
   0.4-
   0.2-
   0.0
       0.0   20.0    40.0    60.0    80.0    100.0   120.0    140.0   160.0   180.0  200.0
Min:   0.00   Q^  4.88    Q2: 7.84     03:  15.22    Q4: 82.96     Max: 373.00


Median: 9.88
  Figure 2-82   Population estimates for iron (FE11), subregion 4C, Western Lake
               Survey - Phase I.
                                     108

-------
 VARIABLE: IRON IN UG/L FOR LAKES s.2000 HA

 Population Size (N): 2299  SE(N): 83.0
 Lake Area (A):  29786     SE(A): 5756
Sample Size:  129
REGION    4
SUB_RGN  D
CLASS
    1.0-
    0.8-
   0.6-
    0.4-
    0.2-
   0.0
       0.0   20.0   40.0   60.0   80.0   100.0   120.0   140.0   160.0   180.0  200.0
Min:  0.00   Qj: 1.12      Q2: 8.63    Q^:  15.89    Q4: 54.90    Max: 381.00
Median:   10.81
Mean:     33.52
Std. Dev.: 55.49
   o.o
      0.0   20.0    40.0    60.0    80.0    100.0   120.0    140.0   160.0   180.0   200.0
Min:  0.00   Qj:  1.10     Q2: 3.12     Q3:  9.94    Q4: 43.77    Max: 381.00

Median:  6.61
   Figure 2-83   Population estimates for iron (FBI 1), subregion 4D, Western Lake
                Survey - Phase I.
                                     109

-------
VARIABLE: IRON IN UG/L FOR LAKES s.2000 HA

Population Size (N): 1609   SE(N):  106.6
Lake Area (A):  11953       SE(A): 2983
Sample Size:  139
REGION    4
SUB_RGN  E
CLASS
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   20.0    40.0    60.0    80.0    100.0   120.0   140.0    160.0   180.0  200.0
Min:   0.00   Qj:  5.54    Q2: 13.31    Q3:  32.08   Q4: 66.89    Max: 438.50
Median:   17.75
Mean:     47.25
Std. Dev.: 72.30
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0   20.0    40.0    60.0    80.0    100.0   120.0   140.0   160.0   180.0  200.0
Min:   0.00   Q^  11.15    Q2: 24.90    Qj:  48.57   Q4: 67.63    Max: 438.50


Median:  46.69
   Figure 2-84    Population estimates for iron (FE11), subregion 4E, Western Lake
                 Survey - Phase I.
                                     110

-------
 VARIABLE: MAGNESIUM AS UEQ/L FOR LAKES s.2000 HA

 Population Size (N):  10393 SE(N): 219.4       Sample Size: 719
 Lake Area (A):  181851     SE(A): 27248
06 AUG 1986
   o.o
       0.0   SO.O   100.0   150.0   200.0   250.0   300.0   350.0   400.0   450.0  500.0
Miri:  1.81    Qj: 8.92    Q2:  18.97    Q3:  36.82    Q4: 96.69    Max: 1471.14
Median:   26.38
Mean:     87.89
Std. Dev.: 174.59
    1.0
   0.6
   0.6-
   0.4-
   0.2-
   0.0
                                                                 i
                                                                X
      0.0   SO.O    100.0   150.0   200.0  2SO.O  300.0  350.0  400.0  450.0   500.0
Min:   1.81    0^  16.40    Q2: 65.43    Q3:  89.33   Q4: 181.41     Max: 1471.14


Median: 73.98


 Figure 2-85   Population estimates for magnesium (MG16), region 4, Western
               Lake Survey - Phase I.
                                      Ill

-------
VARIABLE: MAGNESIUM AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2401  SE(N): 74.5        Sample Size: 149
Lake Area (A):  36009    SE(A): 5284
06 AUG 1986
REGION   4
SUB.RGN A
CLASS
   o.o
       0.0   50.0    100.0   150.0   200.0   250.0  300.0  350.0   400.0   450.0   500.0
Min:   1.81    Oj:  3.51     Q2: 5.43    Qy  9.18     Q4: 17.74    Max:  993.70
Median:   7.21
Mean:     25.29
Std. Dev.: 81.44
   o.o
      0.0   50.0   100.0   150.0   200.0  250.0  300.0  350.0   400.0   450.0   500.0
Min:  1.81    Qj:  3.91     Q2: 9.36    Q3:  26.85   04: 71.45     Max: 993.70


Median:  12.30

   Figure 2-86   Population estimates for magnesium (MG16),  subregion  4A,
                 Western Lake Survey - Phase I.
                                      112

-------
VARIABLE: MAGNESIUM AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 1706   SE(N):  61.7        Sample Size:  159
Lake Area (A):  68038     SE(A): 23335
06 AUG 1986
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
REGION   4
SUB_RGN B
CLASS
       0.0   50.0    100.0   150.0   200.0   250.0   300.0   350.0  400.0  450.0  500.0
Min:  2.71    Q}:  11.08    Q2: 20.29   Q3: 33.14    Q4: 73.43     Max: 851.39
Median:   25.84
Mean:     53.07
Std. Dev.: 99.88
   1.0
   0.6-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0   50.0    100.0  150.0   200.0   2SO.O   300.0  3SO.O  400.0   450.0   500.0
Min:  2.71    QI:  64.36   Q2: 74.00   03:  87.49   04: 90.20    Max:  851.39


Median:  75.04

   Figure 2-87    Population estimates for magnesium (MG16), subregion 4B,
                 Western Lake Survey - Phase I.
                                     113

-------
VARIABLE: MAGNESIUM AS UEQ/L FOR LAKES s.2000 HA
Population Size (N): 2379  SE(N): 143.3
Lake Area (A):  36065     SE(A): 11314
Sample Size:  143
                   06 AUG 1986
REGION    4
SUB_RGN C
CLASS
   o.o
      0.0   50.0   100.0   150.0   200.0  250.0  300.0   350.0   400.0  450.0  500.0
Min:  2.88    Q^  9.29     Q2: 24.65   Q3:  67.53   Q4: 243.44   Max: 853.86
Median:   36.81
Mean:     123.45
Std. Dev.:  170.20
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   50.0   100.0   150.0   200.0  250.0   300.0   350.0   400.0  450.0   500.0
Min:  2.88    Q^ 60.69   02:  213.38  03: 258.41   Q4: 412.70    Max: 853.86
Median: 246.68

   Figure 2-88   Population  estimates for  magnesium (MG16), subregion 4C,
                Western Lake Survey - Phase I.
                                    114

-------
VARIABLE: MAGNESIUM AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2299  SE(N):  83.0        Sample Size: 129
Lake Area (A):  29786      SE(A): 5756
    1.0
06 AUG 1986
   0.8
   0.6-
   0.4-
   0.2-
   0.0
REGION   4
SUB.RGN D
CLASS
       0.0   50.0    100.0   150.0   200.0   250.0  300.0  350.0  400.0   450.0   500.0
Min:  9.62    Q,:  18.47    Q2:  27.69    Q3:  39.03   Q4: 55.19    Max:  1471.14
Median:   34.16
Mean:     84.39
Std. Dev.: 210.99
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   SO.O    100.0   150.0   200.0  250.0   300.0   350.0   400.0   450.0   SOO.O
Min:  9.62    QJ:  16.52    02: 34.04    Q2: 48.33   04: 73.31    Max: 1471.14


Median:  37.13

 Figure  2-89   Population  estimates for magnesium  (MG16),  subregion 4D,
               Western  Lake Survey - Phase I.
                                     115

-------
VARIABLE: MAGNESIUM AS UEQ/L  FOR LAKES s.2000 HA

Population Size (N): 1609   SE(N):  106.6        Sample Size: 139
Lake Area (A):  11953      SE(A): 2983
06 AUG 1986
    1.0
   0.8-
   0.6-
   0.4
   0.2
   0.0
      0.0   50.0    100.0   150.0   200.0  250    300.0  350.0  400.0   450.0   500.0
Min:  4.77    Q^  21.44    Q2: 56.65    Q3:   50.40  Q4: 255.89  Max:  1374.52
Median:   91.49
Mean:     170.65
Std. Dev.: 232.65
   1.0
   0.8-
   0.6-
   0.4-
   0.2
   0.0
      0.0   50.0    100.0  150.0   200.0   250.0   300.0   350.0   400.0   450.0   500.0
Min:  4.77    Qf.  48.73   Q2: 127.69  03: 149.68   Q4: 250.35  Max:  1374.52


Median: 143.36

 Figure 2-90   Population estimates for magnesium (MG16), subregion 4E,
               Western Lake Survey - Phase I.
                                     116

-------
VARIABLE: MANGANESE IN UG/L  FOR LAKES s.2000 HA

Population Size (N): 10393 SE(N):  219.4       Sample Size:  719
Lake Area (A):  181851     SE(A):  27248
REGION    4
SUB_RGN
CLASS
    1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    5.0     10.0    15.0   20.0   25.0    30.0    35.0    40.0    45.0    50.0
Win:  0.00   Q}: 0.00     Q2: 0.00    Q3:  2.63     Q4: 9.94     Max: 212.00
Median:   0.82
Mean:     7.61
Std. Dev.: 18.95
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
                N ^
       0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Min:   0.00   Qj: 0.00    Q2:  1.97     Q3:  11.27    Q4:  17.90     Max: 212.00

Median: 5.81

  Figure 2-91   Population estimates for manganese (MM 11), region 4, Western
                Lake Survey  - Phase I.
                                     117

-------
VARIABLE: MANGANESE IN UG/L FOR LAKES ^2000 HA

Population Size (N): 2401   SE(N): 74.5        Sample Size: 149
Lake Area (A):  36009      SE(A): 5284
REGION   4
SUB_RGN A
CLASS
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0   40.0   45.0    50.0
Min:  0.00   Qj:  0.00    Q2: 0.00    Q3:  3.19     Q4: 11.00    Max:  169.50


Median;   0.00
Mean:     5.99
Std. Dev.: 11.97
   o.o
       0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0   4-0.0   45.0   50.0
Min:   0.00   Qj: 0.00    Q2: 3.78     Q3:  9.62    Q4: 14.02    Max:  169.50


Median: 5.77

   Figure 2-92   Population  estimates for manganese (MN11), subregion 4A,
                Western Lake Survey -  Phase I.
                                      118

-------
VARIABLE: MANGANESE IN UG/L FOR LAKES s.2000 HA

Population Size (N): 1706   SE(N):  61.7         Sample Size: 159
Lake Area (A):  68038     SE(A): 23335
   1.0
                                                                REGION   4
                                                                SUB_RGN B
                                                                CLASS
   o.o
       0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    4-0.0    45.0    50.0
Win:   0.00   Qj:  0.00    Q2: 0.00    Q5:  5.74     Q4: 17.39     Max:  120.00
Median:   2.53
Mean:     10.47
Std. Dev.: 19.69
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    5.0    10.0    15.0    20.0
Min:   0.00   Q-\:  7.39    Q2: 14.56


Median: 15.38
                                        25.0    30.0    35.0    +0.0    45.0    50.0
                                       3:  17.66    Q4: 21.75     Max:  120.00
    Figure 2-93   Population estimates for manganese (MN11). subregion  4B,
                 Western Lake Survey - Phase I.
                                     119

-------
VARIABLE: MANGANESE IN UG/L FOR LAKES s.2000 HA

Population Size (N): 2379  SE(N):  143.3        Sample Size: 143
Lake Area (A):  36065     SE(A):  11314
REGION    4
SUB_RGN C
CLASS
   o.o
      0.0   5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0   45.0   50.0
Min:  0.00   Q^ 0.00    Q2: 0.00    Q^:  0.33    Q4: 6.61     Max:  145.00


Median:    0.00
Mean:     6.35
Std. Dev.: 19.74
   o.o
      0.0   5.0    10.0    15.0   20.0   25.0    30.0    35.0    40.0    45.0   50.0
Min:  0.00   Q^  0.00    Q2: 0.00    Q3:  0.00    Q4: 0.77     Max:  145.00


Median: 0.00

     Figure 2-94   Population estimates for manganese  (MN11), subregion 4C,
                  Western Lake Survey - Phase I.
                                     120

-------
VARIABLE: MANGANESE IN UG/L FOR LAKES s.2000 HA

Population Size (N): 2299  SE(N):  83.0        Sample Size:  129
Lake Area (A):  29786      SE(A): 5756
REGION    4
SUB_RGN  D
CLASS
    1.0-
   0.8-


   0.6-

1-FOO

   0.4-


   0.2-
   0.0
       0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Min:  0.00   0^: 0.00    Q2: 0.70     Q3:  1.69     Q4: 5.28      Max: 212.00
Median:   0.92
Mean:     7.09
Std. Dev.: 22.31
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Min:   0.00   Q^  0.00    Q2: 0.75     Qj:  1.26     Q4: 5.77      Max: 212.00


Median: 0.89

   Figure 2-95   Population  estimates for manganese  (MN11), subregion 4D,
                Western Lake Survey - Phase I.
                                     121

-------
VARIABLE: MANGANESE IN UG/L FOR LAKES s.2000 HA

Population Size (N): 1609   SE(N):  106.6       Sample Size:  139
Lake Area (A):  11953      SE(A): 2983
REGION    4
SUB_RGN E
CLASS
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0'
       0.0    5.0     10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Min:   0.00   Qj: 0.00    Q2: 0.88    Q3:  3.20    Q4:  11.37     Max: 112.00
Median:   1.73
Mean:     9.59
Std. Dev.: 19.68
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Min:   0.00   Cty 0.80    02: 9.36    03:  18.73   Q4: 41.45     Max: 112.00


Median: 12.18

     Figure 2-96   Population estimates for manganese  (MN11),  subregion  4E,
                  Western Lake Survey - Phase I.
                                     122

-------
VARIABLE: NITRATE AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 10393  SE(N): 219.4       Sample Size: 719
Lake Area (A):  181851      SE(A): 27248
REGION   4
SUB_RGN
CLASS
   o.o
      0.0    1.0     2.0    3.0    4.0    5.0    6.0    7.0     8.0     9.0     10.0
Min:  0.00   0^:  0.09    Q2: 0.26     Q3:  0.60    Q4: 2.23     Max:  43.05


Median:    0.38
Mean:     1.69
Std. Dev.: 3.54
   o.o
      0.0    1.0    2.0    3.0    4.0     5.0     6.0     7.0     8.0     9.0    10.0
Min:  0.00   (ty  0.13     02: 0.13    Qj: 0.36     Q4: 1.82     Max: 43.05

Median:  0.22
     Figure 2-97   Population estimates for nitrate (NO316), region 4, Western Lake
                  Survey - Phase I.
                                     123

-------
VARIABLE: NITRATE AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2401   SE(N): 74.5        Sample Size: 149
Lake Area (A):  36009      SE(A): 5284
                                       REGION    4
                                       SUB_RGN A
                                       CLASS
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    1.0     2.0    3.0    4.0    5.0     6.0     7.0     8.0     9.0     10.0
Min:   0.00   Q^  0.08    Q2: 0.24     Q^: 0.68    Q4: 2.52      Max:  10.32
Median:   0.41
Mean:     1.48
Std. Dev.: 2.29
   o.o
      0.0    1.0    2.0
Min:  0.00   QI:  0.09


Median:  0.25
 3.0    4.0     5.0     6.0     7.0     8.0     9.0     10.0
Q2: 0.15    03: 0.35     Q4: 1.46      Max:  10.32
   Figure 2-98   Population estimates for nitrate (NO316), subregion 4A, Western
                 Lake Survey - Phase I.
                                     124

-------
VARIABLE: NITRATE AS UEQ/L FOR LAKES i.2000 HA

Population Size (N): 1706   SE(N):  61.7         Sample Size: 159
Lake Area (A):  68038     SE(A):  23335
    1.0
REGION    4
SUB.RGN  B
CLASS
   o.o
       0.0    1.0     2.0     3.0     4.0    5.0    6.0    7.0     8.0    9.0    10.0
Win:  0.00   Q}: 0.04    Q2:  0.09    Q^:  0.24    Q4: 1.42      Max:  43.05
Median:   0.12
Mean:     1.40
Std. Dev.: 4.27
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    1.0     2.0     3.0    4.0    5.0    6.0     7.0     8.0     9.0     10.0
Min:   0.00   Q^: 0.12    Q2: 0.12     Qj:  0.13     Q4: 0.63     Max: 43.05


Median:  0.13

   Figure 2-99   Population estimates for nitrate (NO316), subregion 4B, Western
                 Lake Survey - Phase I.
                                      125

-------
VARIABLE: NITRATE AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2379  SE(N):  143.3       Sample Size:  143
Lake Area (A):  36065     SE(A):  11314
                                       REGION    4
                                       SUB_RGN  C
                                       CLASS
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0     9.0     10.0
Min:   0.00   Qj: 0.12     Q2: 0.28    Q3:  0.66     Q4: 2.11      Max:  11.63
Median:   0.43
Mean:     1.23
Std. Dev.: 1.92
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    1.0     2.0
Min:   0.00   Q   0.06
 3.0    4.0    5.0    6.0    7.0     8.0    9.0     10.0
Q2: 0.13     Q3:  0.57    Q4: 3.01      Max:  11.63
Median: 0.22
   Figure 2-100  Population estimates for nitrate (NO316), subregion 4C, Western
                 Lake Survey - Phase I.
                                      126

-------
 VARIABLE: NITRATE AS UEQ/L FOR LAKES .2000 HA

 Population Size (N): 2299   SE(N):  83.0        Sample Size: 129
 Lake Area (A):  29786      SE(A):  5756
    1.0
    0.8-
    0.6-
    0.4-
    0.2-
    O.D
       0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0    9.0    10.0
Win:  0.00   Qj:  0.15     Q2:  0.31    Q3: 0.61     Q4: 3.10      Max: 32.14
Median:   0.38
Mean:    2.66
Std. Dev.: 5.27
    1.0
   0.6
   0.6-
   0.4-
   0.2-
   0.0-
       I
       0.0    1.0     2.0     3.0    4.0     5.0     6.0     7.0     8.0     9.0     10.0
Min:   0.00   Qj: 0.17     Q2: 0.22     Q;j:  0.38     Q4: 1.66     Max:  32.14


Median: 0.28

   Figure 2-101  Population estimates for nitrate (NO316), subregion 4D, Western
                 Lake Survey - Phase I.
                                      127

-------
VARIABLE: NITRATE AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 1609   SE(N):  106.6       Sample Size:  139
Lake Area (A):  11953      SE(A):  2983
REGION    4
SUB_RGN  E
CLASS
   o.o
       0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0     9.0    10.0
Min:  0.00   (ty 0.12     Q2: 0.35    Q3:  0.76     Q4: 2.46      Max: 16.80
Median:   0.52
Mean:     1.59
Std. Dev.: 2.60
    1.0
   0.6-
   0.6-
   0.4-
   0.2-
   0.0
             T	i   ---,-   -r      .       	.	r
      0.0    1.0     2.0    3.0    4.0    5.0    6.0    7.0     8.0    9.0    10.0
Min:   0.00   Q^  0.14     Q2: 0.43     Q3:  0.53    Q4: 1.49      Max:  16.80


Median: 0.43
    Figure 2-102  Population estimates for nitrate (NO316), subregion 4E, Western
                 Lake Survey - Phase I.
                                      128

-------
VARIABLE: PH, CLOSED SYSTEM FOR LAKES^.2000 HA
   Xc1: 5.0     Xc2: 5.5       Xc3:  6.0
Population Size (N): 10393 SE(N): 219.4       Sample Size: 719
Lake Area (A):  181851     SE(A): 27248
   O.D
      4.0
Min:  4.79
Median:   7.16
Mean:     7.28
Std. Dev.: 0.64
                   5.0           6.0           7.0            8.0           9.0
              ^  6.81     Q2: 7.05    Q3:  7.29     Q4: 7.69      Max: 9.81
                     PROPORTIONS AND NUMBERS BELOW THE VALUE OF Xc
                    pc1:  0.001  Ncl: 15     Ncu1: 39
                    pc2:  0.001  Nc2:15     Ncu2: 39
                    Pc3: 0.010  Nc3: 103    Ncu3: 172
   1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0-
      4.0           5.0            6.0           7.0           8.0           9.0
Min:  4.79    Q<\: 7.05     Q2:  7.38    Q3: 7.50     Q4: 8.01      Max:  9.81
Median: 7.42
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9d:
9c2:
9c3:
0
0
0
003
003
004
Ac1:
Ac2:
Ac3:
579
579
817
Acu1:
Acu2:
Acu3:
1499
1499
1752
    Figure 2-103  Population estimates for pH (PHSTVL), region 4, Western Lake
                 Survey - Phase I.
                                     129

-------
VARIABLE: PH, CLOSED SYSTEM FOR LAKES^2000 HA
   Xcl:  5.0
Xc2: 5.5
          Xc5: 6.0
Population Size (N): 2401  SE(N):  74.5
Lake Area (A):  36009     SE(A):  5284
                           Sample Size: 149
   1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      4.0           5.0           6.0           7.0           8.0           9.0
Min:  5.84   Q,: 6.59    Q2: 6.84    Q3: 7.06     Q4: 7.38     Max: 9.47
Median:   6.94
Mean:    7.03
Std. Dev.: 0.55
                    PROPORTIONS AND NUMBERS BELOW THE VALUE OF X
pcl:  0.000  Nc1: 0
pc2:  0.000  Nc2:0
Pc3:O.OI3  Nc3:32
                            Ncu1:  **
                            Ncu2:  **
                            Ncu3:  84
   1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      4.0           5.0           6.0           7.0           8.0           9.0
Min:  5.84   0^ 6.73    Q2: 6.99    03: 7.38     Q4: 7.47     Max: 9.47
Median. 7.26
 *+ Not Defined
     PROPORTIONS AND AREA BELOW THE VALUE OF Xc
     gc1:  0.000   Ac1:  0
     gc2:  0.000   Ac2:  0
     gcy.  0.002   Ac5:  64
                             Acu1:   **
                             Acu2:  **
                             Acu3:  168
  Figure 2-104  Population estimates for pH (PHSTVL), subregion 4A, Western
               Lake Survey - Phase I.
                                   130

-------
VARIABLE: PH, CLOSED SYSTEM FOR LAKES<.2000 HA
   Xc1:  5.0      Xc2: 5.5       Xc3:  6.0
Population Size (N): 1706  SE(N): 61.7         Sample Size:  159
Lake Area (A):  68038    SE(A): 23335
   1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      4.0           5.0           6.0           7.0            8.0           9.0
Min:  5.84   Q-,: 6.63    Q2: 6.90    Q3:  7.10     Q4: 7.34     Max:  9.56
Median.   7.00
Mean:    7.02
Std. Dev.: 0.51
 PROPORTIONS AND NUMBERS BELOW THE VALUE OF Xc
pc1:  0.000  Nc1:  0      Ncu1:  **
pc2:  0.000  Nc2:0      Ncu2:  **
Pc3: 0.024  Nc3: 41      Ncu3:  73
   1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      4.0           5.0           6.0           7.0           8.0           9 0
Min:  5.84   QI: 7.19     Q2: 7.41     Q3:  7.43     Q4: 7.96      Max:  9.56
Median: 7.42
 ++ Not Defined
                    PROPORTIONS AND AREA BELOW THE VALUE OF X,
 gc1:  0.000   Acl: 0
 gc2:  0.000   Ac2: 0
 gc3:  0.002   Ac3: 106
Acu1:  **
Acu2: **
Acu3: 193
 Figure 2-105  Population estimates for pH (PHSTVL), subregioo 4B, Western
               Lake Survey - Phase I.
                                  131

-------
VARIABLE: PH, CLOSED SYSTEM FOR LAKESs.2000 HA
   Xcl: 5.0
                Xc2: 5.5
Population Size (N): 2379
Lake Area (A):   36065
                         Xc3: 6.0
                    SE(N):  143.3
                    SE(A): 11314
                                            Sample Size:  143
   1.0
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   O.D-
      4.0
Min:  6.32    Q-


Median:    7.35
Mean:     7.41
Std Dev.:  0.58
   1.0
   0.6-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
Min:
 4.0
6.32
                   5.0           6.0            7.0            8.0            9.0
                 6.90    Q2: 7.13    Q3: 7.56     Q4: 7.99     Max: 9.23
PROPORTIONS AND NUMBERS BELOW THE
pc1: 0.000 Nc1: 0 Ncul: **
pc2: 0.000 Nc2:0 Ncu2: **
Pc3: 0.000 Nc3: 0 Ncu3: **
VALUE OF Xc
                   5.0            6.0            7.0            8.0            9.0
                7.37     Q2: 7.49    Q3:  8.00     Q4: 8.14      Max: 9.23
Median: 7.99
 ** Not Defined
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9c1:
9c2:
9c3:
0.000
0.000
0.000
Acl: 0
Ac2: 0
Ac3: 
Acu1:
Acu2:
Acu3:
**
**
**
    Figure 2-106 Population estimates for pH (PHSTVL), subregion 4C, Western
                  Lake Survey - Phase I.
                                      132

-------
VARIABLE: PH, CLOSED SYSTEM FOR LAKESs.2000 HA
   Xc1: 5.0     Xc2: 5.5       Xc3: 6.0
Population Size (N):  2299  SE(N):  83.0       Sample Size:  129
Lake Area (A): 29786     SE(A): 5756
    1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      4.0
Min:  4.79


Median:
Mean:
Std. Dev.:
7.18
7.27
0.60
   1.0
   0.8-
   0.6-
G(X)
   0.4-
   0.2-
   0.0-
      4.0
Min:  4.79

Median:  7.27
         5.0           e.O           7.0            8.0           9.0
     j:  6.91     Q2: 7.07    Q5:  7.26     Q4: 7.47     Max: 9.59
     PROPORTIONS AND NUMBERS BELOW THE VALUE OF Xc
    pcl:  0.006  Nc1:  15      Ncu1: 39
    pc2:  0.006  Nc2:15      Ncu2: 39
    pc5: 0.013   Nc3:  30     Ncu3: 63
   5.0
6.99
                                6.0
               Q2: 7.18     Qj: 7.39
                                              7.0           8.0           9.0
                                                  Q4: 7.75      Max:  9.59
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9c1:
9c2:
9c3:
0.019
0.019
0.022
Ac1:
Ac2:
AC3^
579
579
647
Acu1:
Acu2:
Acu3:
1499
1499
1572
    Figure 2-107 Population estimates for pH (PHSTVL), lubregion 4D. Western
                 Lake Survey - Phase I.
                                    133

-------
VARIABLE: PH, CLOSED SYSTEM FOR LAKES^2000 HA
   Xcl: 5.0     Xc2: 5.5       Xc3: 6.0
Population Size (N): 1609  SE(IM): 106.6       Sample Size: 139
Lake Area (A):  11953      SE(A): 2983
   1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      4.0
Min:   6.02    Q

Median:   7.60
Mean:     7.72
Std. Dev.: 0.74
   1.0-
   0.8-

   0.6-
G(X)
   0.4-

   0.2-
     5.0            6.0            7.0           8.0           9.0
!= 7.10     Q2:  7.45     Q3:  7.80    Q4: 8.27      Max: 9.81
PROPORTIONS AND NUMBERS BELOW THE
pc1: 0.000 Nc1: 0 Ncu1: **
pc2: 0.000 Nc2:0 Ncu2: **
pc5: 0.000 Nc3: 0 Ncu3: **
VALUE OF Xc
   o.o
      4.0
Min:  6.02    Q^

Median: 7.64

 ** Not Defined
     5.0            6.0
  7.26     Q2: 7.56
                                               7.0            8.0            9.0
                                          7.80     Q4: 8.16     Max: 9.81
PROPORTIONS AND AREA BELOW THE VALUE OF Xc
9c1:
9c2:
9c3:
0.000
0.000
0.000
Ac1: 0
Ac2: 0
Ac3: ^
Acu1:
Acu2:
Acu3:
**
**
**
   Figure 2-108 Population estimates for pH (PHSTVL), subregion 4E, Western
                 Lake Survey - Phase I.
                                    134

-------
VARIABLE: PHOSPHORUS AS UG/L FOR LAKES s.2000 HA

Population Size (N): 10393 SE(N): 219.4       Sample Size: 719
Lake Area (A):  181851     SE(A): 27248
   0.0
       0.0    5.0     10.0    15.0   20.0    25.0    30.0    35.0    40.0    45.0    50.0
Min:   0.00   Qj: 1.69     Q2: 3.48    Q3:  5.97     Q4: 10.93     Max:  188.10


Median:   4.65
Mean:    9.49
Std.  Dev.: 17.75
    1.0
   0.6-
   0.6-
   0.4-
   0.2-
   0.0-
                                                        \
                                                        v
Min:
       0.0    5.0    10.0    15.0    20.0   25.0   30.0   35.0   40.0   45.0   50.0
      0.00   Qj: 1.47     Q2: 2.42     Q3:  4.77     Q4: 7.78     Max:  188.10
Median: 3.47


    Figure 2-109  Population estimates for phosphorus (PTL11), region 4, Western
                  Lake Survey - Phase I.
                                     135

-------
VARIABLE: PHOSPHORUS AS UG/L FOR LAKES *_2000 HA

Population Size (N): 2401   SE(N): 74.5         Sample Size: 149
Lake Area (A):  36009     SE(A): 5284
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    5.0    10,0    15.0    20.0   25.0    30.0    35.0    40.0    45.0    50.0
Min:   0.00   Q^ 0.67    Q2:  1.99     Q3: 3.66    Q4: 7.29      Max: 134.45


Median:   2.92
Mean:    5.50
Std. Dev.: 11.15
   1.0
   o.e-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    5.0    10.0   15.0   20.0   25.0   3O.O    35.0    40.0    45.0    50.0
Min:   0.00   Qj: 0.46    Q2:  1.08     Q3: 2.83     04: 5.31      Max: 134.45


Median: 1.86


       Figure 2-110  Population estimates for phosphorus (PTL11),  subregion 4A,
                     Western Lake Survey - Phase I.
                                     136

-------
VARIABLE: PHOSPHORUS AS UG/L FOR LAKES s.2000 HA

Population Size (N): 1706   SE(N): 61.7         Sample Size:  159
Lake Area (A):  68038     SE(A): 23335
REGION    4
 SUB_RGN B
 CLASS
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   o.o-
       "0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Win:   0.00   Qj: 1.55     Q2: 2.68     Qy  4.32    04: 7.30     Max: 59.65
Median:   3.49
Mean:     5.19
Std. Dev.: 6.59
   1.0
   0.6-
   0.4-
   0.2-
   0.0
       0.0    5.0    10.0    15.0    20.0    25.0    3O.O    3S.O    40.0    45.0    50.0
Min:   0.00   Qj: 2.11     Q2: 2.17     Q3:  4.76     Q4: 5.74      Max: 59.65


Median: 3.50

      Figure 2-111  Population estimates for phosphorus (PTL11), subregion 4B,
                    Western Lake Survey - Phase I.
                                      137

-------
VARIABLE: PHOSPHORUS AS UG/l FOR LAKES s.2000 HA

Population Size (N): 2379   SE(N): 143.3       Sample Size:  143
Lake Area (A):  36065      SE(A): 11314
REGION   4
SUB_RGN C
CLASS
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    5.0    10.0    15.0    20.0   25.0   30.0   35.0    40.0    45.0    50.0
Min:   0.00   Q^ 1.94     Q2: 2.81    Q^: 4.83     Q4:  9.73     Max: 70.10
Median:   3.65
Mean:     8.08
Std. Dev.: 12.27
   1,0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    5.0    10.0    15.0    20.0    25.0   30.0   35.0    40.0    45.0    50.0
Min:   0.00   Q^ 1.75     Q2: 2.35     Qj:  3.39     Q^: 31.00    Max: 70.10


Median: 3.33


    Figure 2-112  Population estimates  for phosphorus  (PTL11), subregion  4C,
                  Western Lake Survey  - Phase I.
                                     138

-------
VARIABLE: PHOSPHORUS AS UG/L FOR LAKES s.2000 HA

Population Size (N): 2299  SE(N): 83.0       Sample Size: 129
Lake Area (A):  29786      SE(A): 5756
                                                                REGION    4
                                                                SUB_RGN  D
                                                                CLASS
    1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    5.0     10.0    15.0    20.0    25.0    30.0    35.0    40.0    45-0    50.0
Min:   0.00   QI: 3.00    Q2: 5.44     Q^:  7.92     Q4: 12.59    Max:  188.10
Median:   6.94
Mean:     12.16
Std. Dev.: 22.26
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0   40.0   45.0   50.0
Min:  0.00   Q^  0.00    Q2: 2.95     0.3:  6.89    Q4: 11.07     Max:  188.10

Median:  4.92


    Figure 2-113 Population estimates for phosphorus  (PTL11). subregion  4D,
                  Western Lake Survey - Phase I.
                                      139

-------
VARIABLE: PHOSPHORUS AS UG/L FOR LAKES s.2000 HA

Population Size (N): 1609   SE(N): 106.6        Sample Size: 139
Lake Area (A):  11953       SE(A): 2983
   1.0-
   0.8-


   0.6-
1-FOO

   0.4-


   0.2-
   0.0'
      0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Min:   0.00   Qj:  3.59    Q2: 7.62     Q3:  13.66   Q4: 26.63    Max:  181.60


Median:    8.06
Mean:     18.29
Std. Dev.: 27.19
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    5.0    10.0    15.0    20.0    25.0    30.0    35.0    40.0    45.0    50.0
Min:  0.00   Q^  6.06    Q2: 7.68     0^:  15.73    Q4: 27.08    Max: 181.60


Median:  8.49
    Figure 2-114  Population  estimates for phosphorus (PTL11),  subregion  4E,
                  Western Lake Survey - Phase I.
                                      140

-------
VARIABLE: POTASSIUM AS UEQ/L  FOR LAKES s.2000 HA

Population Size (N): 10393 SE(N): 219.4       Sample Size: 719
Lake Area (A):  181851     SE(A): 27248
REGION    4
SUB_RGN
CLASS
    1.0-
   0.8-
   0.6-
   o.4-
   0.2-
   0.0
       0.0    3.0     6.0     9.0     12.0     15.0     18.0   21.0    24.0   27.0    30.0
Win:  0.64   (ty 2.93     Q2: 4.61     Q3:  7.22     Q4: 12.84    Max:  502.45
Median:   5.62
Mean:     10.71
Std. Dev.: 24.06
    1.0
   0.6-
   0.6-
   0.4-
   0.2-
   0.0'
       0.0    3.0     6.0     9.0    12.0    15.0    18.0    21.0    24.0    27.0   30.0
Min:   0.64   Qj: 3.81    Q2:  7.68     Q2:  13.87    Q4:  25.20    Max: 502.45


Median: 10.23


    Figure 2-115  Population estimates for potassium (K16), region 4, Western Lake
                  Survey - Phase I.
                                     141

-------
VARIABLE: POTASSIUM AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2401  SE(N): 74.5         Sample Size:  149
Lake Area (A):  36009     SE(A): 5284
    1.0
   0.8-

   0.6-
1-FOO
   0.<4-

   0.2-
   O.D
       0.0    3.0     6.0     9.0    12.0    15.0    18.0    21.0    24.0    27.0    30.0
Win:   1.06    Q^ 2.66     Q2: 3.33    Q3:  4.46     Q4: 7.63     Max:  111.70
Median:   3.72
Mean:     6.52
Std. Dev.: 9.14
   1.0
   0.6-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    3.0     6.0     9.0     12.0    15.0    18.0    21.0    24.0    27.0    30.0
Min:   1.06    Q,: 2.61     02: 4.47     03:  8.49     Q4:  13.42     Max:  111.70

Median: 6.25

     Figure 2-116  Population estimates for potassium (K16), subregion 4A, Western
                   Lake Survey - Phase I.
                                      142

-------
VARIABLE: POTASSIUM AS UEQ/L  FOR LAKES .2000 HA

Population Size (N): 1706  SE(N): 61.7         Sample Size:  159
Lake Area (A):  68038     SE(A): 23335
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    3.0     6.0     9.0    12.0    15.0    18.0    21.0    24,0    27.0   30.0

Min:  0.72   Qj: 2.59     Q2: 4-04     Q3:  5'40     Q4:  10-59    Max:  37-43
Median:   4.76
Mean:     6.75
Std. Dev.: 5.94
    1.0
   0.6-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    3.0     6.0     9.0     12.0    15.0    18.0    21.0    24.0    27.0    30.0
Min:   0.72    Qj: 7.07     Q2: 11.17     03:  15.26    Q4:  25.25    Max:  37.43

Median: 15.00


  Figure 2-117  Population estimates for potassium (K16), subregion 4B, Western
                Lake Survey - Phase I.
                                      143

-------
VARIABLE: POTASSIUM AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2379  SE(N):  143.3       Sample Size: 143
Lake Area (A):  36065      SE(A):  11314
REGION    4
SUB_RGN  C
CLASS
    1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    3.0     6.0     9.0     12.0    15.0    18.0    21.0    24.0    27.0    30.0
Win:   0.77   Q^ 2.75     Q2: 3.69    Q3:  6.12     Q4: 14.78     Max: 75.35
Median:   5.21
Mean:     10.27
Std. Dev.: 12.99
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    3.0     6.0     9.0     12.0     15.0    18.0    21.0    24.0    27.0    30.0
Min:   0.77    Qj: 3.34     Q2:  4.19     Q3:  6.13     Q4: 43.24     Max: 75.35


Median: 6.12

       Figure 2-118  Population estimates for potassium (K16), subregion 4C, Western
                     Lake Survey - Phase I.
                                      144

-------
VARIABLE: POTASSIUM AS UEQ/L FOR LAKES 
-------
VARIABLE: POTASSIUM AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 1609   SE(N):  106.6       Sample Size: 139
Lake Area (A):  11953      SE(A): 2983
REGION    4
SUB_RGN  E
CLASS
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    3.0     6.0     9.0    12.0    15.0    18.0    21.0    24.0    27.0    30.0
Min:   0.92   0^: 3.52    Q2: 7.79     Q3:  13.77    Q4: 21.80     Max: 68.63
Median:   9.02
Mean:     15.29
Std. Dev.: 15.28
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    3.0     6.0    9.0    12.0    15.0    18.0    21.0    24.0    27.0    30.0
Min:   0.92    Qj: 7.80    Q2: 15.92    Q3:  18.33   Q4: 27.42     Max: 68.63


Median: 18.08
        Figure 2-120  Population estimates for potassium (K16), subregion 4E, Western
                      Lake Survey - Phase I.
                                     146

-------
VARIABLE: SECCHI DISK TRANSPARENCY IN M FOR LAKES .2000 HA
Population Size (N): 10393 SE(N):  219.5
Lake Area (A):  182224     SE(A): 27261
Sample Size: 716
   o.o
       0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.25   Q,: 2.62    Q2: 4.16     Q3:  5.73     Q4:  8.21      Max: 27.75
Median:   4.83
Mean:     5.87
Std. Dev.: 4.14
   o.o
      0.0    2.0    4.0    6.0    8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:  0.25    Qj:  3.22    Q2: 5.71     Q3:  7.13     Q4:  10.67     Max: 27.75


Median:  6.48
    Figure 2-121  Population estimates for .ecchi disk transparency (SECMEAN).
                 region 4, Western   Lake Survey - Phase I.
                                      147

-------
VARIABLE: SECCHI DISK TRANSPARENCY IN M FOR LAKES ^.2000 HA
Population Size (N): 2401  SE(N): 74.6
Lake Area (A):  36259     SE(A): 5336
                   Sample Size: 148
REGION    4
SUB_RGN A
CLASS
   1.D
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
      0.0    2.0    4.0    6.0     8.0     10.0    12.0    14.0    16.0    18.0   20.0
Min:   0.35   Q^:  4.23     Q2: 6.30    Q3:  8.36    Q4: 11.05     Max:  27.75
Median:   7.38
Mean:     8.35
Std. Dev.: 5.18
   o.o
      o.o   2.0    4.0
Min:  0.35    Q   6.22
 6.0     8.0     10.0    12.0    14.0    16.0    18.0   20.0
Q2: 7.75    Q3: 9.99     Q4: 13.23    Max:  27.75
Median: 8.81
      Figure 2-122 Population estimates for secchi disk transparency (SECMEAN),
                   subregion 4A, Western Lake Survey - Phase I.
                                      148

-------
 VARIABLE: SECCHI DISK TRANSPARENCY IN M FOR LAKES ^.2000 HA
Population Size (N): 1706   SE(N):  61.7
Lake Area (A):  68038     SE(A): 23335
Sample Size:  159
REGION    4
SUB.RGN  B
CLASS
   0.8-
   0.6-
F(X)
    0.4-
   0.2-
       0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:  0.50   Qj: 2.59    Q2: 4.28     Qj:  6.24-     Q4: 10.02     Max:  24.30
Median:   4.94
Mean:     6.47
Std. Dev.: 4.57
    1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      0.0    2.0    4.0    6.0    8.0    10.0    12.0     14.0     16.0    18.0    20.0
Min:   0.50   Qj:  4.94    Q2: 6.47     Q3: 7.92     Q4: 10.79    Max: 24.30
Median: 6.49

   Figure 2-123  Population estimates for secchi disk transparency (SECMEAN),
                 subregion 4B, Western Lake Survey - Phase I.
                                     149

-------
VARIABLE: SECCHI DISK TRANSPARENCY IN M FOR LAKES ^.2000 HA
Population Size (N): 2379   SE(N):  143.3
Lake Area (A):  36065      SE(A): 11314
Sample Size:  143
REGION   4
SUB_RGN C
CLASS
    1.0-
   0.8-
   0.6-
F(X)
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0    8.0    10.0    12.0     14.0     16.0    18.0    20.0
Min:   1.05    Qj: 2.35    Q2: 3.99     Q3:  5.51     Q4: 7.92      Max: 18.85
Median:   4.91
Mean:     5.47
Std. Dev.: 3.32
      0.0    2.0     4.0    6.0    8.0    10.0    12.0     14.0    16.0    18.0    20.0
Min:   1.05    Q^  1.92     Q2: 3.08     Q3: 4.95     Q4: 7.93     Max: 18.85

Median:  4.72

   Figure 2-124 Population estimates for secchi disk transparency (SECMEAN),
                subregion 4C, Western Lake Survey - Phase I.
                                      150

-------
VARIABLE: SECCHI DISK TRANSPARENCY IN M FOR LAKES s.2000 HA
Population Size (N): 2299  SE(N):  83.2
Lake Area (A):  29900     SE(A):  5770
    1.0
   0.8-
Sample Size:  128
REGION    4
SUB_RGN  D
CLASS
   0.6-
F(X)
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:  0.25   Qj: 2.69     Q2:  3.58    Qj:  4.79     Q4:  6.93     Max: 16.05
Median:   4.19
Mean:     4.80
Std. Dev.: 2.77
    1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0-
      0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:  0.25    Q^:  3.43    Q2: 5.00    Q^:  6.94    04: 7.94      Max:  16.05
Median: 5.38
      Figure 2-125  Population estimates for secchi disk transparency (SECMEAN),
                    subregion 4D, Western Lake Survey - Phase I.
                                     151

-------
VARIABLE: SECCHI DISK TRANSPARENCY IN M FOR LAKES s.2000 HA
Population Size (N): 1609  SE(N): 106.6
Lake Area (A):  11961      SE(A): 2983
                   Sample Size: 138
REGION    4
SUB_RGN E
CLASS
   o.o
      0.0    2.0    4.0    6.0     8.0     10.0    12.0     14.0    16.0    18.0    20.0
Min:   0.30   Qj:  1.71      Q2: 2.72    Q3: 4.06     Q4: 5.43     Max: 14.70
Median:   3.42
Mean:     3.64
Std. Dev.:  2.14
   o.o
      0.0   2.0    4.0
Min:  0.30    Qj:  1.74
 6.0     8.0     10.0    12.0    14.0     16.0    18.0    20.0
Q2: 2.46     Qj:  3.43     Q4: 4.41      Max: 14.70
Median: 3.41
      Figure 2-126  Population estimates for secchi disk transparency (SECMEAN),
                    subregion 4E, Western Lake Survey - Phase I.
                                     152

-------
VARIABLE: SILICA AS MG/L FOR LAKES s.2000 HA

Population Size (N): 10393 SE(N):  219.4        Sample Size:  719
Lake Area (A):  181851     SE(A): 27248
REGION    4
SUB_RGN
CLASS
    1.0-
   0.8-
   0.8-
   0.4-
   0.2-
   0.0-
       0.0    2.0     4.0     6.0    8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:  0.03   Q^ 1.16      Q2: 1-84     Q^:  2.84    Q4: 4.86      Max: 114.05
Median:   2.21
Mean:     4.00
Std. Dev.: 7.04
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.03   Q^ 1.60     Q2: 3.22     Q3: 4.26     Q4: 11.29      Max: 114.05


Median: 3.92
   Figure 2-127  Population estimates for silica (SIO211), region 4, Western Lake
                 Survey - Phase I.
                                      153

-------
VARIABLE: SILICA AS MG/L FOR LAKES ^2000 HA

Population Size (N): 2401   SE(N):  74.5         Sample Size:  149
Lake Area (A):  36009     SE(A):  5284
REGION    4
SUB_RGN  A
CLASS
   0.0
       0.0    2.0     4.0     6.0     8.0    10.0     12.0     14.0    16.0    18.0    20.0

Min:   0.18    Q^ 1.21     Q2:  1-76     Q3:  2.52     Q4: 3.90     Max: 44.33
Median:   2.00
Mean:     3.11
Std. Dev.: 3.85
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.18    Q^ 1.42     Q2:  2.49    Q3:  3.90     Q4:  11.37     Max: 44.33


Median: 2.92
       Figure 2-128 Population estimates for silica (SIO211), subregioo 4A, Western
                    Lake Survey - Phase I.
                                      154

-------
VARIABLE: SILICA AS MG/L FOR LAKES *.2000 HA

Population Size (N): 1706   SE(N): 61.7         Sample Size:  159
Lake Area (A):  68038     SE(A): 23335
REGION    4
SUB_RGN  B
CLASS
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0'
       0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0     16.0    18.0   20.0
Min:   0.14    (ty 1.50     Q2: 2.73     Q3:  3.82     Q4:  5.98     Max: 27.40
Median:   3.14
Mean:     4.17
Std. Dev.: 3.77
   1.0
   0.8-
   0.6-
   0.4
   0.2-
   0.0'
      0.0    2.0     4.0     6.0     8.0    10.0    12.0    14.0    16.0    18.0   20.0
Min:   0.14    QI: 4.10     Q2: 4.12      Q3:  9.55     Q4:  14.79     Max:  27.40


Median: 5.37

       Figure 2-129  Population estimates for silica (SIO211), subregion 4B, Western
                     Lake Survey - Phase I.
                                      155

-------
VARIABLE: SILICA AS MG/L FOR LAKES s.2000 HA

Population Size (N): 2379  SE(N):  143.3       Sample Size: 143
Lake Area (A):  36065     SE(A):  11314
REGION    4
SUB_RGN C
CLASS
   1.0-
   0.8-
   0.6-
   0.4-
   0.2
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.20   0^: 1.78     Q2: 2.27    Q3:  3.39    Q4: 5.07      Max: 28.50
Median:   2.88
Mean:     4.33
Std. Dev.: 4.74
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.20   Ot: 2.02     Q2: 2.16     03:  3.87    Q4: 5.53     Max: 28.50


Median: 3.85

     Figure 2-130  Population estimates for silica (SIO2JJ), subregion 4C, Western
                   Lake Survey - Phase I.
                                      156

-------
VARIABLE: SILICA AS MG/L FOR LAKES s.2000 HA

Population Size (N): 2299  SE(N): 83.0        Sample Size:  129
Lake Area (A):  29786     SE(A): 5756
REGION    4
SUB_RGN D
CLASS
    i.o
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Win:  0.03   Qj: 0.80    Q2: 1.19      Q5:  1.59     Q4: 2.53      Max: 114.05
Median:   1.37
Mean:     3.84
Std. Dev.: 12.07
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.03   QJ: 0.93     02: 1.40     03: 2.35     Q4: 3.22      Max: 114.05

Median: 1.60

     Figure 2-131   Population estimates for silica (SIO211), tubregion 4D, Western
                   Lake Survey  Phase I.
                                     157

-------
VARIABLE: SILICA AS MG/L FOR LAKES s.2000 HA

Population Size (N): 1609  SE(N): 106.6       Sample Size: 139
Lake Area (A):  11953      SE(A): 2983
REGION    4
SUB_RGN E
CLASS
    1.0-
   0.8-


   0.6-
1-FOO
   0.4-


   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.07   Qj: 1.15      Q2: 1.81      0.3:  2.84    Q4: 6.82      Max: 26.11


Median:   2.12
Mean:     4.89
Std. Dev.: 6.27
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    2.0     4.0     6.0     8.0     10.0    12.0    14.0    16.0    18.0    20.0
Min:   0.07   Q^ 0.97     Q2: 1.62      Qj:  2.75     Q4: 5.55      Max: 26.11


Median. 2.04


    Figure 2-132  Population estimates for silica (SIO211), subregion 4E, Western
                  Lake Survey - Phase I.
                                      158

-------
VARIABLE: SODIUM AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 10393 SE(N): 219.4        Sample Size:  719
Lake Area (A):  181851      SE(A): 27248
    1.0
REGION    4
SUB_RGN
CLASS
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    20.0   40.0   60.0   80.0   100.0   120.0   140.0   160.0   180.0   200.0
Min:  1.00    Qj: 12.38    Q2:  19.41    Q3:  30.16    Q4: 49.24     Max: 5415.75


Median:   23.85
Mean:     53.26
Std. Dev.: 220.73
    1.0'
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0   20.0   40.0    60.0    80.0    100.0   120.0   140.0   160.0   180.0   200.0
Min:   1.00    Ot: 17.81    Q2: 38.65   03:  66.89   Q4: 113.01    Max: 5415.75

Median: 47.39
     Figure 2-133  Population estimates for sodium (NA16), region 4, Western Lake
                   Survey  Phase I.
                                     159

-------
VARIABLE: SODIUM AS UEQ/L FOR LAKES s.2000 HA

Population Size (N): 2401   SE(N): 74.5         Sample Size: 149
Lake Area (A):  36009     SE(A): 5284
REGION    4
SUB_RGN  A
CLASS
   1.0
   0.8-
   0.6-
   0.4-
   0.2
   0.0
       0.0   20.0    40.0    60.0    80.0    100.0   120.0    140.0   160.0   180.0   200.0
Win:   4.96    Q^  10.13    Q2: 15.95    Q^:  22.01    Q4: 33.60    Max:  1211.04


Median:   18.73
Mean:     28.81
Std. Dev.: 63.08
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   20.0    40.0    60.0    80.0    100.0   120.0    140.0   160.0   180.0   200.0
Min:  4.96    Qt:  13.44   Q2: 18.92    Q^:  36.54   Q4: 69.25    Max:  1211.04


Median:  26.70

     Figure 2-134  Population estimates for sodium (NA16), subregion 4A, Western
                   Lake Survey - Phase I.
                                    160

-------
 VARIABLE: SODIUM AS UEQ/L FOR LAKES ^.2000 HA

 Population Size (N): 1706   SE(N): 61.7        Sample Size: 159
 Lake Area (A):  68038     SE(A): 23335
REGION    4
SUB_RGN  B
CLASS
    1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0   20.0   40.0   60.0   80.0   100.0   120.0   140.0   160.0   180.0   200.0
Min:  5.18    Q^ 17.21     Q2: 24.81    Q3:  37.54    Q4: 57.54    Max: 358.44
Median:   31.04
Mean:     45.23
Std. Dev.: 46.27
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0   20.0    40.0    60.0    80.0    100.0   120.0   140.0   160.0   180.0  200.0
Min:  5.18    QJ:  39.37   Q2: 81.39   03:  86.17    Q4: 110.16    Max: 358.44

Median:  81.55

   Figure 2-135  Population estimates for sodium (NA16), subregion 4B, Western
                 Lake Survey -  Phase I.
                                      161

-------
VARIABLE: SODIUM AS UEQ/L FOR LAKES ^.2000 HA

Population Size (N): 2379   SE(N):  143.3       Sample Size: 143
Lake Area (A):  36065      SE(A): 11314
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0   20.0    40.0    60.0    80.0   100.0   120.0   140.0   160.0   180.0   200.0
Min:   1.00    Q,:  11.70    Q2: 18.47    Q3:  33.57    Q4: 50.17    Max:  296.02


Median:   24.83
Mean:     47.03
Std. Dev.: 61.88
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   20.0    40.0    60.0    80.0   100.0   120.0   140.0   160.0   180.0   200.0
Min:   1.00    Q^  16.93   Q2: 19.13    Q3:  42.00    Q4: 233.66  Max:  296.02

Median.  38.74

      Figure 2-136  Population estimates for sodium (NA16), subregioo 4C, Western
                   Lake Survey - Phase I.
                                       162

-------
VARIABLE: SODIUM AS UEQ/L FOR LAKES ^2000 HA

Population Size (N): 2299  SE(N):  83.0        Sample Size:  129
Lake Area (A):  29786      SE(A): 5756
REGION    4
SUB_RGN  D
CLASS
    1.D-
   0.8-
   0.6-
   0.4-
   0.2-
        	1       I	1	1	1	1	1	1	1	-1
        .0   20.0   40.0    60.0    80.0    100.0   120.0   140.0   160.0   180.0   200.0

Min:  5.74    Q,: 12.45    Q2: 17.73    Q3:  25.06    Q4: 38.57    Max: 5415.75
Median:   20.78
Mean:     78.33
Std. Dev.: 449.54
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0   20.0    40.0    60.0    80.0    100.0   120.0    140.0    160.0   180.0  200.0
Min:   5.74    Q^  14.72    Q2: 20.20    Qy.  37.48   Q4: 46.80    Max: 5415.75


Median: 25.84

  Figure 2-137  Population estimates for sodium (NA16), subregion 4D, Western
                Lake Survey - Phase I.
                                     163

-------
VARIABLE: SODIUM AS UEQ/L  FOR LAKES ^2000 HA

Population Size (N): 1609  SE(N): 106.6       Sample Size:  139
Lake Area (A):  11953      SE(A): 2983
REGION    4
SUB_RGN  E
CLASS
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   O.D-
       0.0   20.0    40.0    60.0    80.0   100.0   120.0   140.0   160.0   180.0   200.0
Min:   3.18    Qj:  15.89   Q2: 25.53    Q3: 44.73    Q4: 91.68    Max:  587.25
Median:   33.77
Mean:     71.66
Std. Dev.: 99.16
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   20.0    40.0    60.0    80.0   100.0   120.0   140.0   160.0   180.0   200.0
Min:   3.18    Q-|:  25.03   Q2: 47.70    Q^: 53.57    Q4: 199.59   Max:  587.25

Median:  48.35

   Figure 2-138  Population estimates for sodium (NA16), lubrcgion 4E, Western
                 Lake Survey - Phase I.
                                     164

-------
VARIABLE: SULFATE AS UEQ/L FOR LAKESs.2000 HA
   Xc1: 50.0     Xc2:  100.0     Xc3: 150.0
Population Size (N): 10393 SE(N): 219.4       Sample Size: 719
Lake Area (A):  181851      SE(A): 27248
    1.D-
   0.8-


   0.6-
1-FOO

   0.4-


   0.2-
   0.0-
       0.0    10.0   20.0   30.0   40.0   50.0   60.0   70.0   80.0   90.0   100.0
Min:  0.23   Q,: 6.24     Q2: 13.55   Q3:  23.68    Q4: 38.66    Max: 2909.06
Median:   18.90
Mean:     45.45
Std. Dev.: 176.07
PROPORTIONS AND NUMBERS ABOVE THE
pcl: 0.135 Ncl: 1405 Ncul: 1676
pc2: 0.059 Nc2:609 Ncu2: 803
pc3: 0.039 Nc3: 404 Ncu3: 568
VALUE OF Xc
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   10.0    20.0    30.0   40.0   50.0   60.0    70.0    80.0    90.0    100.0
Min:   0.23   Qj:  5.85    Q2:  13.55   Q5:  26.91    Q4: 48.68    Max: 2909.06
Median: 20.12
     Figure 2-139  Population estimates for sulfate (SO416), region 4, Western Lake
                   Survey - Phase I.
PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
gc1: 0.199 A
gc2: 0.099 A
gc3: 0.020 A
c1: 36138
c2: 17930
c3: 3640
Acu1: 54507
Acu2: 31912
Acu3: 6143
                                     165

-------
 VARIABLE: SULFATE AS UEQ/L  FOR LAKES<.2000 HA
         50.0
                Xc2:  100.0     Xc3: 150.0
Population Size (N): 2401   SE(N):  74.5
Lake Area (A):  36009     SE(A): 5284
                                            Sample Size:  149
    1.0-
    0.8-
    0.6-
    0.4-
    0.2-
    0.0-
       0.0   10.0    20.0   30.0    40.0    50.0    60.0    70.0   80.0   90.0   100.0
 Min:  0.23    Q^ 3.64     Q2: 5.12     Q3:  7.38    Q4: 13.52    Max: 385.90
 Median.   6.56
 Mean:     19.57
 Std. Dev.:  49.55
PROPORTIONS AND NUMBERS ABOVE
pcl: 0.078 Nc1: 187 Ncu1: 300
pc2: 0.027 Nc2:64 Ncu2: 137
Pc3: 0.027 Nc3: 64 Ncu3: 137
THE VALUE OF Xc
    1.0
    0.8-


    0.6-
 l-G(X)

    0.4-


    0.2-
    0.0
       0.0    10.0    20.0   30.0    40.0    50.0    60.0    70.0   80.0   90.0    100.0
 Min:  0.23    Qj: 4.08     Q2: 6.45     Q3:  11.55    Q4: 26.64    Max: 385.90
 Median: 7.32
                      PROPORTIONS AND AREA ABOVE THE VALUE OF X
                     gc1:  0.093    Ac1:  3363
                     gc2:  0.004   Ac2:  141
                     gc3:  0.004   Ac3:  141
Acu1:   6793
Acu2:  302
Acu3:  302
Figure 2-140  Population estimates for sulfate (SO416), subregion 4A, Western
              Lake Survey - Phase I.
                                     166

-------
VARIABLE: SULFATE AS UEQ/L FOR LAKES^.2000 HA
   Xc]: 50.0    Xc2: 100.0     Xc3:  150.0
Population Size (N):  1706  SE(N): 61.7        Sample Size:  159
Lake Area (A):  68038     SE(A): 23335
    i.o-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
Min:
 o.o
0.27
10.0    20.0
 Q: 2.33
                          30.0
                           40.0
              50.0
60.0
                                                     70.0
80.0
                                                                   90.0
                                                                         100.0
Q2: 10.51    Q3:  20.46    Q4: 43.32    Max:  362.37
Median:   14.74
Mean:     27.62
Std. Dev.: 39.42
PROPORTIONS AND NUMBERS ABOVE
pcl: 0.171 Nc1: 292 Ncul: 374
pc2: 0.033 Nc2:57 Ncu2: 96
pc3: 0.007 Nc3: 12 Ncu3: 30
THE VALUE OF Xc
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0   10.0    20.0   30.0   40.0    50.0
Min:  0.27    Q^ 0.00
Median.  13.54
                    ov.v    -.v.v/   *jv.v   60.0   70.0    80.0    90.0   100 0
                   Q2: 11-03    03:  13.55    Q4: 30.29
               PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
               gc1.   0.138    Ac1:  9389      Acul:  17408
               gc2:   0.072    Ac2:  4865      Acu2: 10902
                                : 725       Acu3: 1865
                                                   Max: 362.37
                     3
-------
VARIABLE: SULFATE AS UEQ/L  FOR LAKES^.2000 HA
   XcV-  50.0    Xc2: 100.0    Xc3: 150.0
Population Size (N): 2379  SE(N):  143.3        Sample Size: 143
Lake Area (A):  36065     SE(A):  11314
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0   10.0    20.0   30.0   40.0    50.0    60.0    70.0    80.0   90.0   100.0
Min:  0.89    Q^  6.34     Q2:  10.59    Q3:  20.12    Q4: 32.27    Max:  349.19
Median:   15.57
Mean:     27.45
Std. Dev.:  46.09
                     PROPORTIONS AND NUMBERS ABOVE THE VALUE OF X,
pc1:  0.107  Nc1: 256
pc2:  0.036  Nc2:85
pc3: 0.016  Nc3: 37
Ncu1: 399
Ncu2: 171
     = 97
   1.0'
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   10.0    20.0   30.0   40.0    50.0    60.0    70.0    80 0   90.0   100.0
Min:  0.89    Q}:  17.07    Q2:  31.94    Q3:  51.04    Q4: 98.92   Max:  349.19
Median: 43.85
PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
9d:
9c2:
9c3:
0.414
0.209
0.006
Ac1:
Ac2:
AC3:
14914
7521
210
Acu1:
Acu2:
Acu3:
30241
19260
551
  Figure 2-142  Population estimates for sulfate (SO416), subregion 4C, Western
                Lake Survey - Phase I.
                                     168

-------
VARIABLE: SULFATE AS UEQ/L  FOR LAKES<.200Q HA
   Xc1: 50.0
           Xc2: 100.0
X,
c3:
    150.0
Population Size (N): 2299  SE(N):  83.0
Lake Area (A):  29786      SE(A): 5756
                                       Sample Size:  129
   O.D
       o.o
Min:   6.16
       10.0    20.0    30.0   40.0   50.0   60.0    70.0    80.0    90.0    100.0
        Qj:  19.10    Q2: 22.33   Q3:  27.82    Q4:  34.96    Max: 2909.06
Median.
Mean:
Std. Dev.:
     24.38
     51.45
     239.89
PROPORTIONS AND NUMBERS ABOVE THE VALUE
pc1: 0.056 Ncl: 128 Ncu1: 198
pc2: 0.019 Nc2: 45 Ncu2: 85
pc3: 0.013 Nc3: 30 Ncu3: 63
OFXC
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
Min:
 0.0    10.0   20 0   30.0   40.0    50.0    60.0    70.0    80.0    90.0    100.0
6.16    QY- 19.24    Q2:  23.62   Q3:  30.59   Q4: 47.08     Max: 2909.06
Median. 27.22
PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
gc1: 0.056 A
gc2: 0.023 A
gc3: 0.022 A
cl: 1667
c2: 679
c3: 647
ACUI- 3123
Acu2: 1604
Acu3: 1572
   Figure 2-143  Population estimates for sulfate (SO416), subregion 4D, Western
                 Lake Survey - Phase I.
                                      169

-------
VARIABLE: SULFATE AS UEQ/L  FOR LAKESs.2000 HA
   Xcl:  50.0    Xc2:  100.0     Xc3:  150.0
Population Size (N): 1609   SE(N):  106.6       Sample Size:  139
Lake Area (A):  11953      SE(A): 2983
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
Min:
 0.0    10.0    20.0    30.0    40.0    50.0    60.0   70.0   80.0   90.0   100 0
3.29   Qv 16.62    Q2: 28.36    Q3: 41.99    Q4: 115.54    Max:  2212.21
Median.   34.60
Mean:     121.02
Std. Dev.: 319.40
PROPORTIONS AND NUMBERS ABOVE THE VALUE OF Xc
pcl: 0.337 Nc1: 543
pc2: 0.223 Nc2:359
Pc3: 0.162 Nc3: 261
NCu1= 711
Ncu2: 505
Ncu3: 390
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
Min:
 0 0    10.0    20.0    30.0    40.0    50.0    60.0    70.0    80.0    90.0   100 0
3.29   QI: 22.93   Q2: 37.29    Q3: 79.56    Q4: 135.97   Max:  2212.21
Median. 62.61
PROPORTIONS AND AREA ABOVE THE VALUE OF Xc
9c1:
9c2:
9c3:
0.569
0.395
0.160
Ac1:
Ac2:
AC3^
6805
4725
1917
Acu1:
Acu2:
Acu3:
11737
9238
3909
       Figure 2-144  Population estimates for sulftte (SO416), subregion 4E. Western
                     Lake Survey - Phase I.
                                       170

-------
VARIABLE: TURBIDITY IN NTU FOR LAKES s.2000 HA
Population Size (N): 10393 SE(N):  219.4
Lake Area (A):  181851     SE(A): 27248
Sample Size:  719
REGION    4
SUB_RGN
CLASS
    1.D'
   0.8-
   0.6-
    0.4-
    0,2-
   0.0
       0.0    1.0     2.0     3.0    4.0    5.0    6.0    7.0     8.0    9.0     10.0
Min:  0.00   Qj: 0.20    Q2- 0.29     Q5:  0.4-5     Q4: 0.87      Max:  30.00
Median:   0.36
Mean:     0.89
Std. Dev.: 1.87
   o.o
      0.0    1.0    2.0    3.0    4.0     5.0     6.0     7.0     8.0     9.0     10.0
Min:   0.00   Qj:  0.20    Q2: 0.33     Qj: 0.45     Q4: 1.08     Max:  30.00
Median: 0.37
     Figure 2-145  Population estimates for turbidity (TURVAL), region 4, Western
                   Lake Survey  Phase I.
                                     171

-------
VARIABLE: TURBIDITY IN NTU FOR LAKES ^2000 HA

Population Size (N): 2401   SE(N): 74.5        Sample Size: 149
Lake Area (A):  36009      SEf'AV. 5284
   i.o
                                      REGION    4
                                       SUB_RGN A
                                       CLASS
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    1.0     2.0     3.0    4.0     5.0     6.0     7.0     8.0     9.0     10.0
Min:   0.00   Q-,: 0.10    Q2: 0.17     Q3: 0.23     Q4: 0.38     Max:  30.00
Median:   0.19
Mean:     0.40
Std. Dev.: 1.46
   1.0-l-r
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0    1.0     2.0
Min:   0.00   Qf. 0.09


Median:  0.18
 3.0    4.0     5.0     6.0     7.0     8.0     9.0    10.0
Q2: 0.17    03: 0.19     Q4: 0.37     Max: 30.00
       Figure 2-146 Population estimates for turbidity (TURVAL), subregion 4A,
                    Western Lake Survey - Phase I.
                                      172

-------
VARIABLE: TURBIDITY IN NTU FOR LAKES 
-------
VARIABLE: TURBIDITY IN NTU FOR LAKES <^2000 HA

Population Size (N): 2379  SE(N):  143.3       Sample Size: 143
Lake Area (A):  36065     SE(A):  11314
   1.0-
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    1.0     2.0     3.0     4.0     5.0     6.0    7.0     8.0    9.0    10.0
Win:   0.10    Q); 0.17     Q2: 0.27    Q3: 0.37    Q4: 0.54      Max:  5.20


Median:   0.29
Mean:     0.60
Std. Dev.: 0.83
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0-
       0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0    9.0    10.0
Min:   0.10    Q^ 0.27     Q2: 0.36    Q3: 1.10     Q4: 2.31      Max:  5.20


Median: 0.39

      Figure 2-148  Population estimates  for turbidity (TURVAL), subregion 4C.
                    Western Lake Survey - Phase I.
                                       174

-------
VARIABLE: TURBIDITY IN NTU  FOR LAKES s.2000 HA

Population Size (N): 2299  SE(N):  83.0        Sample Size: 129
Lake Area (A):  29786     SE(A):  5756
    1.0
   0.8-
   0.6-
   0.4-
   0.2-
   0.0
       0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0     9.0     10.0
Min:  0.10    Qj: 0.27     Q2:  0.39    Q3:  0.75     Q4: 1.40     Max:  14.70
Median:   0.55
Mean:     1.20
Std. Dev.: 1.91
   o.o
      0.0    1.0     2.0     3.0     4.0     5.0     6.0     7.0     8.0     9.0     10.0
Min:  0.10    Q^ 0.16    Q2:  0.27    03:  0.40     04: 0.89     Max:  14.70

Median:  0.32


       Figure 2-149  Population estimates for turbidity (TURVAL), tubregion 4D,
                     Western Lake Survey - Phase I.
                                      175

-------
VARIABLE: TURBIDITY IN NTU FOR LAKES 
-------
VARIABLE: WATERSHED AREA IN HA FOR LAKES s.2000 HA
                    06 AUG 1986
Populotion Size (N): 10393 SE(N):  219.4
Lake Area (A): 181851     SE(A):  27248
Sample Size:  719
   1.0-
   0.6-
   0.6-
   0.4-
   0.2-
   0.0
REGION    4
SUB.RGN
CLASS
      0.0   100.0   200.0   300.0   400.0   SOO.O  600.0  700.0   600.0   900.0  1000.0
Min:  5.18    QV 45.27    Q2: 84.94   Q3:  163.56  04: 435.99  Max: 291593.00
Median:   118.55
Mean:     1270.29
Std. Dev.:  11259.90
   0.6-
   0.6
   0.4
   0.2
   0.0
      0.0   100.0   200.0   300.0   400.0  500.0  600.0  700.0   800.0   900.0  1000.0
Min:  5.18    Qj: 232.75   Q2:  1284.80 Qj:  5181.94  Q4: 15169.50 Max: 291593.00


Median: 2925.16


     Figure 2-151  Population  estimates for  watershed area (WSHED), region 4,
                  Western Lake Survey - Phase L
                                      177

-------
VARIABLE: WATERSHED AREA IN HA FOR LAKES s.2000 HA
                   06 AUG 1986
Population Size (N): 2401  SE(N):  74.5
Lake Area (A):  36009     SE(A): 5284
Sample Size:  149
REGION   4
SUB_RGN A
CLASS
    1.0
   O.B-
   0.6-
   0.4-
   0.2-
   0.0
       0.0   100.0  200.0   300.0  400.0  500.0   600.0   700.0  000.0  900.0  1000.0
Min:   10.36   Q^ 47.23    Q2:  94.22    Q3: 186.98   Q4:439.50   Max: 186382.00
Median:   145.17
Mean:     1105.29
Std. Dev.: 9363.64
   1.0
   o.e-
   0.6-
   0.4-
   0.2-
   0.0-
      0.0   100.0   200.0   300.0  400.0   500.0   600.0  700.0  800.0  900.0  1000.0
Min:  10.36   0^ 217.93   02: 492.22   03: 1904.64 Q4: 8684.10  Max: 186382.00


Median: 873.24


     Figure 2-152  Population estimates for watershed area (WSHED), subregion 4A,
                  Western Lake Survey - Phase I.
                                     178

-------
VARIABLE: WATERSHED AREA IN HA FOR LAKES s.2000 HA

Population Size (N): 1706  SE(N): 61.7       Sample Size: 159
Lake Area (A):  68038    SE(A): 23335
06 AUG 19B6
    i.D
   0.6-
   0.6-
   0.4-
   0.2-
   0.0
REGION   4
SUB_RGN B
CLASS
       0.0   100.0  200.0  300.0  400.0   500.0  600.0  700.0   800.0   900.0  1000.0
Min:   10.36   Qj: 35.95   Q2: 71.44    Qy  132.29  Q4: 380.56  Max: 291593.00
Median:   97.52
Mean:     3412.31
Std. Dev.: 24855.30
   1.0
   O.B-
   0.6-
   0.4-
   0.2-
   0.0
      0.0   100.0  200.0  300.0   400.0  500.0  600.0   700.0   800.0   900.0  1000.0
Min:   10.36   0^  1591.85  Q2: 13921.40 Q3:  15117.40 Q4: 57031.20 Max: 291593.00
Median: 14519.40
    Figure 2-153  Population estimates for watershed area (WSHED), subregioo 4B,
                 Western Lake Survey - Phase L
                                     179

-------
VARIABLE: WATERSHED AREA IN HA FOR LAKES s.2000 HA

Population Size (N): 2379  SE(N): 143.3       Sample Size:  143
Lake Area (A):  36065     SE(A): 11314
06 AUG 1986
    i.o
   0.6
   0.6-
   0.4-
   0.2-
   0.0
REGION   4
SUB_RGN C
CLASS
      0.0   100.0  200.0  300.0  400.0   500.0   600.0  700.0  600.0  900.0   1000.0
Min:  5.18    Q}: 43.36   Q2: 70.31   Q3: 121.19   Q4:213.87    Max: 26977.40
Median:   94.56
Mean:     1204.69
Std. Dev.: 4038.62
   1.D
   0.6-
   0.6-
   0.4-
   0.2-
   0.0'
      0.0   100.0  200.0   300.0   400.0   500.0   600.0  700.0   800.0  900.0   1000.0
Min:  5.18    Qj:  152.34   Q2: 1891.12  Q3:  4282.44 Q4: 13565.60 Max: 26977.40


Median:  3538.01


    Figure 2-154  Population estimates for watershed area (WSHED), subregion 4C,
                  Western Lake Survey - Phase I.
                                     180

-------
VARIABLE: WATERSHED AREA IN HA FOR LAKES s.2000 HA

Population Size (N): 2299  SE(N): 83.0        Sample Size:  129
Lake Area (A):  29786     SE(A): 5756
06 AUG 1986
REGION    4
SUB_RGN D
CLASS
    1.0
   0.8-
   0.6
   0.4-
   0.2-
   0.0-
      0.0   100.0  200.0  300.0   400.0   SOO.O   600.0  700.0   800.0   900.0  1000.0
Min:   15.54   Qj:  67.02    Q2: 139.58  Q3:  245.52  Q4: 617.50   Max: 8407.10
Median:   177.77
Mean:     479.38
Std Dev.: 1006.74
   to
   O.B-
   0.6-
   0.4-
   OJ-
   0.0

      0.0  100.0   200.0   300.0  400.0  500.0  600.0  700.0   800.0  900.0  1000.0
Min:   15.54   Q^ 18170   Q2:  474.72   Q3:  881.21   Q4: 4848.54  Max: 8407.10

Median:  692.63


   Figure 2-155  Population estimates for watershed area (WSHED), lubregion 4D,
                 Western Lake Survey - Phase I.
                                     181

-------
VARIABLE: WATERSHED AREA IN HA FOR LAKES s.2000 HA

Population Size (N): 1609  SE(N): 106.6       Sample Size: 139
Lake Area (A):  11953      SE(A): 2983
06 AUG 1986
   1.0
   0.8-
   0.6-
   0.4-
   0.2-
      0.0   100.0  200.0  300.0  400.0   500.0   600.0   700.0   600.0   900.0  1000.0
Min:  5.18    Qv- 34.76   Q2: 67.14   Q3: 138.86  Q4:402.58   Max: 4902.85


Median:   75.00
Mean:     472.34
Std. Dev.: 1061.52
   1.0
   t).e-
   0.6-
   0.4-
   0.2
   0.0
       0.0   100.0  200.0  300.0  400.0   500.0   600.0   700.0   800.0   900.0  1000.0
Min:  5.18    Qj: 73.42   Q2: 223.74  Q3: 570.00  Q4: 1579.76  Max: 4902.85


Median: 258.48
     Figure 2-156  Population estimates for watershed area (WSHED), subregion 4E,
                   Western Lake Survey - Phase I.
                                     182

-------
 VARIABLE: WATERSHED/LAKE AREA RATIO FOR LAKES s.2000 HA

 Populotion Size (N): 10393 SE(N): 219.4       Somple Size: 719
 Loke Area (A):  181851     SE(A): 27248
    1.0
    0.8
    0.6-
 F(X)
    0.4-
    0.2-
    0.0
       0.0    10.0    20.0   30.0   40.0   50.0   60.0   70.0   00.0   90.0   100.0
Min:  2.59   0,: 11.04    Q2: 17.89    Q2:  29.91    04: 58.54    Max: 3332.45
Median:   23.69
Mean:    74.96
Std. Dev.: 259.02
    1.0


   o.e


   0.6-
G(X)

   0.4-


   0.2-
   0.0
       0.0   10.0    20.0    30.0    40.0    30.0    60.0    70.0    BO.O    00.0    100.0
Min:  2.59    0,:  10.49    02: 16.94    Qy.  33.60   04: 79.16     Max: 3332.45


Median. 24.44
  Figure 2-157  Population estimates for watershed area/lake area (WALA), region
                4, Western Lake Survey - Phase I.
                                     183

-------
VARIABLE: WATERSHED/LAKE AREA RATIO FOR LAKES $.2000 HA

Population Size (N): 2401   SE(N): 74.5         Sample Size: 149
Lake Area (A):  36009     SE(A): 5284
    1.0
   0.8*
   0.6-
F(X)
   0.4-
   0.2
   0.0
                        ^ .*
       0.0    10.0   20.0   30.0    40.0    50.0    60.0    70.0    80.0    90.0    100.0
Min:  2.74    QV' 11.80   Q2: 17.88    Qy  29.55   Q4: 66.70    Max: 2010.27
Median:   22.86
Mean:     61.37
Std. Dev.: 152.16
   1.0
   o.e-


   0.6-
G(X)

   0.4-


   0.2
   0.0
      0.0   10.0    20.0    30.0    40.0    50.0    60.0    70.0    80.0    90.0   100.0
Min:  2.74    0,:  7.53    Q2: 16.81    Q3:  25.02   04: 61.32     Max: 2010.27

Median:  20.81


   Figure 2-158  Population estimates  for watershed area/lake area (WALA),
                 subregion 4A, Western Lake Survey - Phase I.
                                      184

-------
 VARIABLE: WATERSHED/LAKE AREA RATIO FOR LAKES s.2000 HA
Population See (N): 1706   SE(N):  61.7
Lake Area (A):  68038     SE(A):  23335
Sample Size: 159
    1.0
   0.8-
   0.6-
F(X)
   OA-
   0.2-
   0.0
       0.0   10.0    20.0    30.0    40.0    50.0    60.0    70.0    60.0    90.0   100.0
Min:  2.59    0,:  9.61     02: 14.81    Q2:  23.62   Q4: 42.69     Max: 924.22
Median:   19.77
Mean:     39.66
Std. Dev.: 87.39
   1.0
   0.8-


   0.6-
G(X)

   0.4-


   0.2-
   0.0-
      0.0   10.0    20.0    30.0    40.0    50.0    60.0    70.0   80.0   00.0   100.0
Min:  2.59    Qj:  10.27    02: 11.27     Qj: 60.22   Q4: 78.16    Max:  924.22


Median.  24.04
   Figure 2-159  Population estimates  for  watershed area/lake  area (WALA),
                 subregioo 4B, Western Lake Survey - Phase I.
                                      185

-------
VARIABLE: WATERSHED/LAKE AREA RATIO FOR LAKES s.2000 HA
Population Size (N): 2379  SE(N):  143.3
Lake Area (A):  36065     SE(A): 11314
Sample Size:  143
    i.o
   0.8
   0.6
   0.4
   0.2
   0.0
       0.0   10.0    20.0    30.0    40.0    SO.O    60.0   70.0   60.0   90.0   100.0
Min:   3.38   0^:  10.76   Q2: 16.30    Q3: 27.97    Q4:48.28    Max: 2219.22
Median:   23.22
Mean:     84.11
Std. Dev.; 290.65
   i.o
   O.B-


   0.6-
G(X)

   0.4


   0.2
   0.0
      0.0   10.0    20.0    30.0    40.0   50.0   60.0   70.0    80.0   90.0    100.0
Min:   3.38   0^  12.89    Q2: 27.97    03: 35.08   Q4: 128.18    Max: 2219.22


Median.  32.72
   Figure 2-160  Population  estimates for watershed  area/lake area (WALA).
                 subregioo 4C, Western Lake Survey - Phase I.
                                      186

-------
VARIABLE: WATERSHED/LAKE AREA RATIO FOR LAKES s.2000 HA

Population Sire (N): 2299  SE(N):  83.0       Sample Size: 129
Lake Area (A):  29786      SE(A): 5756
REGION   4
SUB_RGN D
CLASS
    1.0
   0.8
   0.6-
F(X)
   0.4
   03-
   0.0
       0.0   10.0    20.0    30.0    40.0   50.0   60.0   70.0    60.0    90.0   100.0
Min:  4.78    Qj:  13.06   Q2: 23.60   Q3: 37.39   Q4: 72.33   Max: 398.21
Median:   30.17
Mean:     53.50
Std. Oev.: 66.51
    1.0
   0.6-


   0.6-
G(X)

   0.4-


   0.2-
   0.0
      0.0   10.0    20.0   30.0   40.0   50.0    60.0    70.0   80.0   90.0   100.0
Min:  4.78    0^  9.48     Q2: 19.76    Qy.  24.42    Q4: 57.81    Max:  398.21


Median:  24.17
     Figure 2-161  Population estimates for watershed area/lake area (WALA),
                  subregiofl 4D. Western Lake Survey - Phase I.
                                     187

-------
VARIABLE: WATERSHED/LAKE AREA RATIO FOR LAKES *.2000 HA

Population Stee (N): 1609   SE(N):  106.6       Sample Size: 139
Lake Area (A):  11953      SE(A): 2983
REGION   4
SUB_RGN E
CLASS
    i.o
   0.8
   0.6-
F(X)
   0.4-
   0.2
   0.0
       0.0   10.0    20.0    30.0    40.0   50.0   60.0   70.0    00.0    90.0    100.0
Min:  3.41    Q,:  11.37    Q2: 17.46   Q3: 27.87    04:73.32    Max: 3332.45
Median:   23.52
Mean:     149.83
Std. Dev.: 501.60
    1.0
   o.e-


   0.6-
C(X)

   0.4-


   0.2-
   0.0

      0.0   10.0    20.0    30.0   40.0   50.0   60.0    70.0    80.0    00.0    100.0
Min:   3.41    0,:  10.18    Q2: 18.63   Qy.  20.89   Q4: 96.48    Max: 3332.45


Median: 18.64


      Figure 2-162  Population  estimates for watershed area/lake  area (WALA),
                    subregion 4E, Western Lake Survey - Phase 1.
                                    188

-------
                                    SECTION 3

   USGS MAPS USED TO DEFINE AND CHARACTERIZE THE LAKE POPULATION

     Several types of USGS maps were used in the Survey; for convenience they have been
classified here as small-scale (1:100,000 or smaller) and large-scale (1:62,500 or larger).

3.1  SMALL-SCALE MAPS

     The 1:100,000 scale maps were used to define the map population and select lakes (Volume
I, Section 2.2.1).  They were also used for lake characterization for some parameters (Volume I,
Section 2.4). The 1:250,000 scale maps were used for lake characterization only when 1:100,000
scale maps were  not available in topographic format.
     Table  3-1 is a list of all  small-scale USGS maps used in the WLS-I.  Parts of states
covered by the maps are indicated in the middle column.  Publication dates provide unique map
identification; publication dates separated by slashes include dates of map revisions; "&" indicates
two versions of this map were used (topographic and  planimetric).

3.2 LARGE-SCALE MAPS

     Table 3-2 is a list of all large-scale (1:24,000 and 1:62,500) USGS topographic maps used in
the WLS-I to identify non-target lakes (Volume I, Section 2.2.2) and characterize selected lakes
(Volume I, Section 2.4). Publication dates provide unique map identification; publication dates
separated by slashes indicate dates of map revisions.
                                        189

-------
Table 3-1  USGS Small Scale Maps Used to Define Population and Characterize Selected Lakes,
           Western Lake Survey - Phase I
1:250,000 Scale
Map Name
ALTURAS
ASHTON
AZTEC
BAKER
BEND
BOZEMAN
BUTTE
CANYON CITY
CASPER
CHALLIS
CHEYENNE
CHICO
CHOTEAU
CODY
CONCRETE
CRAIG
CRESENT
CUTBANK
DENVER
DILLON
DRIGGS
DUBOIS
DURANGO
ELK CITY
FRESNO
GRAND JUNCTION
GRANGEVILLE
GREELEY
HAILEY
HAMILTON
(continued)
States
Covered
CA
ID,MT,WY
NM
ID.OR
OR
MT
MT
OR
WY
ID
WY
CA
MT
WY
WA
CO
OR
MT
CO
MT.ID
ID.WY
ID.MT
CO
ID.MT
CA
CO.UT
ID.OR
CO
ID
ID.MT

Publication
Date
1954/1971
1955/1972
1954/1980
1955/1974
1955/1971
1958/1972
1958/1977
1955/1970
1955
1957/1963
1954/1969
1958/1970
1955/1977
1955/1980
1955/1962
1954/1974
1955/1970
1960/1968
1953/1978
1955/1977
1955/1981
1955/1978
1945
1956/1982
1962/1971
1956/1969
1955/1979
1954/1976
1955/1970
1956/1969

                                        190

-------
Table 3-1  (continued)
HOQUIAM
IDAHO FALLS
KALISPELL
LANDER
LEADVILLE
MARIPOSA
MEDFORD
MOAB
MONTROSE
OGDEN
PRESTON
PUEBLO
RATON
RAWLINS
REDDING
RENO
ROSEBURG
SACRAMENTO
SALEM
SALT LAKE CITY
SANDPOINT
SEATTLE
SHERIDAN
SUSANVILLE
THE DALLES
THERMOPOLIS
TRINIDAD
VANCOUVER
VERNAL
VICTORIA
WALKER LAKE
WALLACE
WEED
WENATCHEE
WHITE SULFUR SPRINGS
YAKIMA
(continued)
OR.WA
ID
MT
WY
CO
CA,NV
OR
CO.UT
CO
UT.WY
ID.WY
CO
NM
WY
CA
NV
OR
CA
OR
UT
ID.WA
WA
WY
CA
OR.WA
WY
CO
OR.WA
CO,UT
WA
CA.NV
ID.MT
CA
WA
MT
WA

1958/1974
1962
1957/1979
1955/1982
1955/1977
1957/1970
1955/1976
1956/1969
1956/1977
1954/1982
1955/1982
1954/1962
1954/1976
1954/1962
1958/1976
1957/1971
1958/1970
1957/1970
1960/1977
1954/1970
1958/1966
1958/1974
1955/1962
1962
1953/1971
1955/1980
1955/1962
1958/1974
1954/1965
1957/1974
1957/1969
1956/1981
1958/1976
1957/1971
1958/1972
1958/1971

                                       191

-------
Table 3-1  (continued)
1:100,000 scale
Map Name
ABIQUIU
AFTON
ANTONITO
ARCO
ASHTON
BATES
BELLINGHAM
BEND
BENTON RANGE
BIGHORN CRAGS
BISHOP
BLANCA PEAK
BONNERS FERRY
BRIDGEPORT
BURGESS JUNCTION
BURNEY
BUTTE SOUTH
CANON CITY
CARBONDALE
CARSON CITY
CASPER
CENTRALIA
CHALLIS
CHAMA
CHELAN
CHEWELAH
CHICO
CODY
COLVILLE
CRATER LAKE
CRESENT
DEADWOOD RIVER
DEARBORN RIVER
DEL NORTE
DENVER WEST
DIAMOND LAKE
DILLON
DURANGO
DUTCH JOHN
ELK CITY
ELLISTON
ENNIS
(continued)
States
Covered
NM
WY
CO
ID
ID.WY
OR
WA
OR
CA.NV
ID.MT
CA
CO
ID,MT
CA.NV
WY.MT
CA
MT
CO
CO
NV
WY
WA
ID
NM.CO
WA
WA.ID
CA
WY.MT
WA.ID
OR
OR
ID
MT
CO
CO
OR
MT
CO
UT.CO.WY
ID
MT
MT.WY

Publication
Date
1978
1982
1984
1979
1976
1978
1975
1980
1976
1982
1978
1982
1983 &
1975
1979
1976
1975
1982
1982
1979
1979
1980
1982
1981
1975
1984 &
1980
1980
1984 &
1978
1979
1982
1975
1982
1983
1978
1983 &
1983
1981
1981
1975
1975













1978












1978


1978







1978






                                         192

-------
Table 3-1  (continued)
ENTERPRISE                     OR                         1978
ESTES PARK                     CO                         1984
FORT COLLINS                   CO                         1980
FRESNO                         CA                         1982
GANNETT PEAK                  WY                         1978
GARDINER                       MT.WY                     1975
GLENWOOD SPRINGS              CO                         1981
GRAND JUNCTION                CO                         1981
GUNNISON                       CO                         1983
HAMILTON                       ID.MT                      1980
HAPPY CAMP                     CA                         1983
HAYFORK                       CA                         1982
HEADQUARTERS                  ID.MT                      1982
HEBGEN LAKE                   MT.ID.WY                   1975
HOOD RIVER                     OR                         1982 & 1978
HOOPA                          CA                         1983
HUNGRY HORSE RESERVOIR       MT                         1981
IDAHO CITY                     ID                         1982
JACKSON                        WY                         1981
JACKSON LAKE                   WY                         1981
KINGS PEAK                     UT.WY                     1982
KOOSKIA                        ID                         1981
LA PINE                         OR                         1976
LAKE ALMANOR                  CA                         1976
LANDER                         WY                         1978
LARAMIE                        WY                         1981
LEADVILLE                      CO                         1983
LIBBY                           MT                         1979
LIMA                           ID.MT                      1979
LOA                             UT                         1980
LOGAN                          UT.ID.WY                   1978
MADRAS                         OR                         1983
MC ARTHUR                     CA                         1978
MC CALL                        ID.OR                      1980 & 1978
MC KENZIE RIVER                OR                         1983 & 1973
MEDFORD                       OR.CA                      1978
MEEKER                         CO                         1979
MISSOULA WEST                  MT,ID                      1981
MOUNT ADAMS                   WA                         1978
MOUNT BAKER                   WA                         1979
MOUNT HOOD                    OR                         1983
MOUNT OLYMPUS                WA                         1979
MOUNT RAINIER                  WA                         1978
MOUNT SHASTA                  CA                         1979
MOUNT ST. HELENS               WA                         1980
(continued)
                                 193

-------
Table 3-1  (continued)
MOUNT WHITNEY                CA                         1978
NEZ PERCE PASS                 ID.MT                       1981
NORTH SANTIAM RIVER          OR                         1983 & 1978
NUCLA                         CO                         1983
OAKRIDGE                     OR                         1983 & 1974
OREGON CITY                   OR                         1982
PALISADES                     WY.ID                       1975
PAONIA                         CO                         1983
PHILIPSBURG                    MT                         1976
PIKES PEAK                     CO                         1983
PINEDALE                      WY                         1981
PISTOL CREEK                   ID                         1982
PLACERVILLE                   CA                         1979
PLAINS                         MT                         1980
POLSON                         MT                         1980
PORT TOWNSEND                WA                         1975
PORTOLA                       CA                         1979
PRESTON                       ID.WY.UT                    1983
RED LODGE                     MT.WY                      1978
REDDING                       CA                         1976
RIGGINS                        ID.OR                       1978
RINGLING                      MT                         1979
ROBINSON MTN                  WA                         1976
SAGUACHE                     CO                         1982
SAINT MARY                    MT                         1981
SALMON                        ID.MT                       1981
SALT LAKE CITY                UT,WY                      1980
SANDPOINT                     ID.MT                       1978
SARATOGA                     WY.CO                      1982
SAUK RIVER                    WA                         1978
SEATTLE                       WA                         1975
SEELEY LAKE                   MT                         1979
SHAVER LAKE                   CA                         1980
SHELTON                       WA                         1979
SILVERTON                     CO                         1982
SKYKOMISH RIVER               WA                         1975
SMITH VALLEY                  NV.CA                      1978
SNOQUALMIE PASS               WA                         1975
STEAMBOAT SPRINGS             CO                         1980
SUN VALLEY                    ID                         1980
SUSANVILLE                    CA                         1976
SWAN PEAK                     MT                         1978
TACOMA                       WA                         1975
THE RAMSHORN                 WY                         1978
THOMPSON FALLS                ID.MT                       1978
(continued)
                                 194

-------
Table 3-1  (continued)
THREE RIVERS
TRUCKEE
TWISP
VAIL
WALDEN
WALLACE
WARREN
WENATCHEE
WHEELER PEAK
WHITE CLOUD PEAKS
WHITEFISH RANGE
WISDOM
WORLAND
YAAK RIVER
YELLOWSTONE N.P. NORTH
YELLOWSTONE N.P. SOUTH
YOSEMITE VALLEY
YREKA
CA
CA.NV
WA
CO
CO.WY
ID.MT
ID
WA
NM.CO
ID
MT
MT.ID
WY
MT
WY.MT
WY
CA
CA
1978
1977
1978
1980
1981
1978
1981
1975
1982
1982
1981
1978
1979
1980
1983
1982
1978
1979
                                        195

-------
Table 3-2  USGS Large-Scale Topographic Maps Used to Identify Non-Target Lakes and
           Characterize Selected Lakes, Western Lake Survey - Phase I
1:62,500 scale
Map Name
ABIATHAR PEAK
ALPINE
AVON
BANDERA
BASS LAKE
BATTLE AX
BEARTOOTH BUTTE
BIG BEND
BIG PINE
BLUE RIVER
BONANZA KING
BREITENBUSH HOT SPRINGS
BROKENTOP
BUMPING LAKE
CAMP NELSON
CANYON VILLAGE
CHERRYVILLE
CHIWAUKUM MTS
CHUCKSNEY MTN
COFFEE CREEK
COLTON
COOKE CITY
CORNUCOPIA
CRATER LAKE NP & VICINITY
CUPRUM
CUTOFF MTN
DEEP LAKE
DETROIT
DEVILS POSTPILE
(continued)
State
WY
MT
MT
WA
CA
OR
WY
CA
CA
OR
CA
OR
OR
WA
CA
WY
OR
WA
OR
CA
OR
MT
OR
OR
ID
MT
WY
OR
CA

Publication
Date
1959
1956
1958
1960
1953
1956
1956
1961
1950
1955
1955
1961
1959
1962
1956
1959
1955
1965
1955
1955
1955
1956
1954
1959
1957
1942
1950
1956
1953

                                        196

-------
Table 3-2  (continued)
DUNSMUIR
EAGLE CAP
ECHO MTN
ELMIRA
EMIGRANT
ENTERPRISE
ENUMCLAW
FRANK ISLAND
FRIDLEY PEAK
GARNET MTN
GARWOOD BUTTE
GLACIER PEAK
GOLDSTONE MTN
GORE PASS
GRANITE FALLS
GRASSY LAKE RESERVOIR
GREYHOUND RIDGE
GROVER
HARVEY MTN
HE DEVIL
HEBGEN DAM
HIGH ROCK
HOLDEN
ILLINOIS PEAK
INDEX
JONESVILLE
LAKE ELEANOR
LAKE OF THE WOODS
LAKE SHANNON
LASSEN PEAK
LEESBURG
LIBERTY
LONE BUTTE
(continued)
CA
OR
OR
ID
MT
OR
WA
WY
MT
MT
OR
WA
MT
CO
WA
WY
ID
UT
CA
ID
MT
OR
WA
MT
WA
CA
CA
OR
WA
CA
ID
WA
WA

1954
1954
1955
1951
1955
1957
1956
1959
1955
1955
1956
1950
1956
1956
1956
1956
1961
1952
1956
1957
1950
1956
1944
1957
1957
1958
1956
1955
1952
1956
1950
1961
1965

                                        197

-------
Table 3-2  (continued)
LUCERNE
MACDOEL
MACKAY
MADISON JUNCTION
MAMMOTH
MANZANITA LAKE
MARBLEMOUNT
MARION PEAK
MATTERHORN PEAK
MERCED PEAK
MINERAL KING
MONO CRATERS
MONROE
MONTGOMERY CREEK
MORTON
MOUNT MC LOUGHLIN
MOUNT SI
MT CHALLENGER
MT COWEN
MT DOUGLAS
MT HANCOCK
MT HARKNESS
MT HOLMES
MT JEFFERSON
MT MORRISON
MT PEND OREILLE
MT PINCHOT
MT SHUKSAN
MT STEEL
MT STUART
MT WHITNEY
MT WOOD
NORRIS JUNCTION
(continued)
WA
CA
ID
WY
WY
CA
WA
CA
CA
CA
CA
CA
WA
CA
WA
OR
WA
WA
MT
MT
WY
CA
WY
OR
CA
ID
CA
WA
WA
WA
CA
MT
WY

1944
1954
1960
1958
1958
1956
1953
1953
1956
1953
1956
1953
1956
1956
1957
1955
1960
1953
1940
1941
1959
1956
1958
1961
1953
1951
1953
1953
1947
1961
1956
1939
1958

                                         198

-------
Table 3-2  (continued)
OLANCHA
OSO
PELICAN BUTTE
PINECREST
POLARIS
POTLATCH
PROSPECT PEAK
QUARTZVILLE
RANDLE
RUSTLER PEAK
SHERMAN MTS
SHOEINHORSE MTN
SHUTEYE PEAK
SILVERTON
SNOQUALMIE PASS
SPANISH PEAKS
SPAR CITY
ST REGIS
STRAIGHT PEAK
SUMMIT LAKE
TEPHITE DOME
THE BROTHERS
THREE FINGERED JACK
THREE SISTERS
TOKETEE FALLS
TOWER JUNCTION
TOWER PEAK
TRIPLE DIVIDE PEAK
TUOLUMNE MEADOWS
TYLER PEAK
VIPOND PARK
WALDO LAKE
WALLACE
(continued)
CA
WA
OR
CA
MT
WA
CA
OR
WA
OR
WY
CA
CA
WA
WA
MT
CO
MT
MT
OR
CA
WA
OR
OR
OR
WY
CA
CA
CA
WA
MT
OR
ID

1956
1956
1955
1956
1959
1952
1957
1956
1962
1955
1948
1954
1953
1957
1961
1950
1957
1956
1960
1956
1952
1947
1959
1959
1956
1959
1956
1956
1956
1946
1958
1956
1957

                                       199

-------
Table 3-2  (continued)
WARM RIVER BUTTE               ID                            1957
WHITE PASS                       WA                           1962
YOSEMITE                         CA                           1956
(continued)
                                    200

-------
Table 3-2  (continued)
1:24,000 scale
Map Name
AGNES MTN
AHERN PASS
ALADDIN MTN
ALLENS PARK
ALMANOR
ALPINE LAKE
ANTHONY LAKES
ANTHRACITE RANGE
ANTONE PEAK
APACHE MESA
ARLINGTON EAST
ASHNOLA MTN
ATLANTA EAST
BABB
BACHELOR BUTTE
BANNER SUMMIT
BAYHORSE LAKE
BEAR RIVER RESERVOIR
BEARTRAP MTN
BELLINGHAM SOUTH
BIG HAWK MTN
BIG MARVINE PEAK
BIG NARROWS
BIG SANDY OPENING
BIG SHEEP MTN
BIG SNOW MTN
BLACKMARE
BLANCA PEAK
BLODGETT MTN
BLODGETT MT
(continued)
State
WA
MT
WA
CO
CA
WY
OR
CO
MT
NM
WA
WA
ID
MT
OR
ID
ID
CA
MT
WA
MT
CO
CO
WY
WY
WA
ID
CO
ID
ID

Publication
Date
1963
1968
1967/1982
1957/1978
1979
1952
1972
1961
1968
1983
1956/1968
1969
1972
1968
1963/1981
1972
1963
1979
1963/1983
1954/1972
1964
1977
1962
1969
1968
1965
1973
1967
1966
1966

                                         201

-------
Table 3-2  (continued)
BLUE CANYON
BOB LAKES
BOETTCHER LAKE
BOGACHIEL PEAK
BOGARD BUTTES
BONANZA
BOSTON PEAK
BOTTLE PASS
BOULDER CHAIN LAKE
BOULDER PEAK
BOX LAKE
BRIDGER LAKES
BRIGHTON
BUCKS LAKE
BUFFALO PASS
BULL RUN LAKE
BUNKER  HILL
BURLEY
CANYON  DAM
CAPE HORN LAKES
CAPITOL  PEAK
CAPLES LAKE
CAPTAIN POINT
CARIBOU CREEK
CARLTON LAKE
CARNATION
CARPP RIDGE
CARSON
CARSON PASS
CASCADE PASS
CASTLE PEAK
CEDAR CANYON
(continued)
CA
WY
CO
WA
CA
CO
CO
CO
ID
CA
ID
WY
UT
CA
CO
OR
CA
WA
CA
ID
CO
CA
WA
ID
MT
WA
MT
OR
CA
WA
WA
NM
1955/1979
1952
1956
1950
1983
1980
1962
1957
1964
1981
1969
1968
1955/1975
1979
1955
1962
1955/1973
1953/1981
1979
1972
1960
1979
1965/1982
1969
1967
1953/1968/1973
1971
1979
1979
1963
1969
1983
                                 202

-------
Table 3-2  (continued)
CEDAR RIDGE
CHEPETA LAKE
CHESTER
CHESTER
CHICAGO PARK
CHIKAMIN CREEK
CHRISTINA LAKE
CILLY CREEK
CISCO GROVE
CLOUD PEAK
COLTER BAY
COLTON
COLUMBINE PASS
COMANCHE PEAK
COMO PEAKS
CONY MTN
CORA
COUGAR
COVINGTON MILL
CRANE PRAIRIE RES
CRATER MTN
CRAZY PEAK
CRESENT LAKE
CRESTONE PEAK
CROOKED CREEK PASS
CRYSTAL PEAK
CUMBERLAND PASS
CURLEY CREEK
CYGNET LAKE
DAVIS PEAK
DEADMAN MTN
DEER CREEK
DENNIS MTN
(continued)
ID
UT
CA
CO
CA
WA
WY
MT
CA
WY
WY
OR
CO
CO
MT
WY
WY
WA
CA
OR
WA
MT
OR
CO
CO
WY
CO
ID
MT
CO
UT
WY
ID
1966
1965
1979
1967
1949/1979
1968/1981
1953
1965
1955/1979
1967
1968
1955/1970
1973
1962
1964
1953
1964
1983
1982
1963/1981
1963
1972
1967/1981
1967
1970
1967
1982
1965/1983
1965
1955
1972
1965
1978
                                 203

-------
Table 3-2  (continued)
DEVILS CAUSEWAY
DEVILS PUNCHBOWL
DIABLO DAM
DICK CREEK
DOGTOOTH PEAK
DOGWOOD PEAK
DOME LAKE
DOME PEAK
DONNELL LAKE
DOUBLETOP PEAK
DOWNS MTN
DROMEDARY PEAK
DRY CREEK
DUNDEE MEADOWS
EAST CANYON RIDGE
EAST GLACIER PARK
EAST PORTAL
EBBETTS PASS
ECHO LAKE
EDAHO MTN
EDDY MTN
EL CAPITAN
ELDORADO PEAK
ELECTRIC PEAK
ELIZABETH MTN
ELK LAKE
ELKHORN PEAK
EMERALD BAY
EMERALD LAKE
EMERALD LAKE
EMPIRE
ENGINEER MTN
ENGLISH MTN
(continued)
CO
CA
WA
MT
CA
CA
WY
WA
CA
WY
WY
UT
CO
WY
WA
MT
CO
CA
CA
ID
MT
MT
WA
CO
UT
OR
OR
CA
CO
MT
CO
CO
CA
1977
1981
1963
1964
1982
1979
1964
1963
1979
1967
1968
1955/1975
1965
1956
1970
1968
1958
1979
1955/1969
1972
1964
1964
1963
1980
1967
1963/1981
1972
1955/1969
1973
1956
1958/1974
1960
1983
                                 204

-------
Table 3-2  (continued)
ENDS LAKE
ERICKSON BASIN
ERMONT
ESTES PARK
EXPLORER PEAK
FALCONBERRY PEAK
FALL CITY
FALL RIVER PASS
FARWELL MTN
FAYETTE LAKE
FENN MTN
FERRY LAKE
FINGER MESA
FISH LAKE
FITSUM SUMMIT
FLORENCE LAKE
FLOYD PEAK
FOX CREEK
FOX LAKE
FRED BURR LAKE
FREEL PEAK
FREMONT LAKE NORTH
FREMONT LAKE SOUTH
FREMONT PEAK NORTH
FREMONT PEAK SOUTH
FRENCH BASIN
FROSTY CREEK
GABLE MTN
GALENA
GANNETT PEAK
GARFIELD BASIN
GASH POINT
GILBERT
(continued)
ID
UT
MT
CO
UT
ID
WA
CO
CO
WY
ID
WY
CO
ID
ID
CA
CO
MT
UT
MT
CA
WY
WY
WY
WY
MT
WA
MT
ID
WY
UT
MT
WA
1969
1972
1952
1961/1977
1967
1963
1953/1968/1973
1958/1977
1962
1968
1966
1970
1964
1966
1973
1983
1962
1968
1965
1971
1955/1969
1968
1964
1968
1968
1978
1969
1968
1970
1968
1967
1966
1969
                                205

-------
Table 3-2  (continued)
GLACIATE BUTTE
GLENBROOK
GLOBE
GOAT MTN
GOLD LAKE
GOLDEN LAKES
GOODYEARS BAR
GOVERNMENT CAMP
GRAND LAKE
GRAND MESA
GRANDADDY LAKE
GRANITE LAKE
GRANITEVILLE
GRASS MTN
GRAVE PEAK
GRAVEYARD PEAK
GRAY RESERVOIR
GRAY WOLF LAKE
GREEN MTN
GREEN RIVER LAKES
GREENVILLE
GROTTO
HALLS MTN
HAMILTON BUTTES
HARRIS PARK
HAYDEN PEAK
HAYSTACK GULCH
HAZARD LAKE
HEMLOCK LAKE
HICKMAN BUTTE
HOBART MILLS
HOLLAND LAKE
HOLLY
(continued)
WA
NV
CA
WA
CA
WA
CA
OR
CO
CO
UT
ID
CA
ID
ID
CA
CO
MT
WA
WY
CA
WA
WY
WA
CO
UT
CO
ID
MT
OR
CA
MT
WA
1970
1955/1982
1956
1983
1981
1971
1951/1975
1962/1980
1958/1978
1955
1972
1963
1982
1969
1966
1982
1965/1978
1965
1970
1968
1979
1965/1982
1981
1970
1957/1974
1972
1960
1963
1965
1962/1980
1981
1965
1953/1981
                                206

-------
Table 3-2  (continued)
HOMER YOUNGS PEAK
HOMESTAKE RESERVOIR
HOMEWOOD
HOODOO MEADOWS
HORN PEAK
HORSESHOE LAKE
HORTON PEAK
HOWARDSVILLE
HUBBART RESERVOIR
HUCKLEBERRY MTN
HUNGRY ROCK
HUNTER PEAK
HUNTINGTON LAKE
INDEPENDENCE LAKE
INDEPENDENCE PASS
INDIAN POST OFFICE
IRISH MTN
IRON MINE MTN
ISOLATION PEAK
JACK MTN
JAROSA
JEANETTE MTN
JENNIES BUTTE
JENNINGS CAMP CREEK
JENNY LAKE
KAISER PEAK
KINGS PEAK
KISINGER LAKES
KNOWLES
KOOTENAI FALLS
LAKE AGNES
LAKE ANGELINE
LAKE FORK
MT
CO
CA
ID
CO
WY
ID
CO
MT
WA
ID
ID
CA
CA
CO
ID
OR
UT
CO
WA
NM
ID
WA
MT
WY
CA
UT
WY
MT
MT
CO
WY
ID
1966
1970
1955/1969
1962
1959
1968
1970
1955
1964
1966/1982
1966
1966
1982
1981
1960
1966/1984
1963/1981
1972
1958
1969
1953/1977
1966
1970
1977
1968
1982
1965
1956/1979
1984
1963/1983
1956
1967
1973
                                207

-------
(continued)
Table 3-2  (continued)
LAKE GILLETTE
LAKE HELEN
LAKE INEZ
LAKE JOY
LAKE MARSHALL
LAKE MC DONALD EAST
LAKE WHATCOM
LAKE WOOTEN
LANGER PEAK
LAYBRINTH MTN
LEADVILLE SOUTH
LEIDY PEAK
LEON PEAK
LEWISTON
LITTLE SQUAW CREEK
LIZARD HEAD PEAK
LOA 4 NE
LONE BUTTE
LONG TOM MTN
LONGS PEAK
LOON LAKE
LUDWIG MTN
LYMAN LAKE
MAHONEY BUTTE
MALLARD PEAK
MAPLE FALLS
MAPLETON
MARBLE MTN
MARKLEEVILLE
MARLETTE LAKE
MAROON BELLS
MARSH PEAK
MARTIN PEAK
WA
WY
MT
WA
MT
MT
WA
WA
ID
WA
CO
UT
CO
CA
CO
WY
UT
WA
ID
CO
CA
CO
UT
ID
ID
WA
ID
CA
CA
NV
CO
UT
WA
1966/1982
1967
1965
1953/1968
1965
1968
1952/1972
1953/1968
1972
1965/1981
1969
1963
1960
1982
1964
1981
1953
1965
1962
1961/1978
1952/1973
1964
1967
1967
1963
1972
1969
1980
1979
1955/1982
1960
1965
1969
                                208

-------
Table 3-2  (continued)
MARTIN PEAK
MASON LAKE
MASSACRE MTN
MAURICE MTN
MC HENRYS PEAK
MEDICINE BOW PEAK
MEDICINE MTN
MERNA
METALINE
MIRAMONTE
MIRROR LAKE
MISSION PEAK
MONARCH LAKE
MONROE
MONTEZUMA
MORTON
MOSQUITO LAKE
MOSQUITO PEAK
MOUNT OF THE HOLY CROSS
MOWICH LAKE
MT ANTERO
MT ARRIVA
MT ARTER
MT BAIRD
MT BARNEY
MT BONNEVILLE
MT BRADLEY
MT CARRIE
MT CHAMPION
MT CLEVELAND
MT CRAMER
MT DANIEL
MT DARWIN
MT EMMONS
WA
WA
ID
MT
CO
WY
CA
WY
WA
CA
UT
WA
CO
WA
CO
ID
WY
ID
CO
WA
CO
WA
WY
ID
WA
WY
MT
WA
CO
MT
ID
WA
CA
UT
1969
1953
1967
1978
1957
1961
1978
1980
1967
1966
1972
1966
1958/1978
1953/1968/1973
1958
1968
1967
1978
1970
1971
1983
1963
1953
1966
1969
1981
1958/1980
1950
1960
1968
1963
1965
1983
1965
                                 209

-------
(continued)
Table 3-2  (continued)
MT ETHEL
MT EVANS
MT EVANS
MT EVERLY
MT GEDUHN
MT GIVENS
MT GODDARD
MT HENRY
MT HILGARD
MT HILTON
MT JACKSON
MT JACKSON
MT LAGO
MT LOGAN
MT LYALL
MT MC GUIRE
MT MORAN
MT OURAY
MT PALOMA
MT POWELL
MT RICHTHOFEN
MT ROCKWELL
MT ROOTHAAN
MT ROSE
MT SPICKARD
MT THOMPSON
MTTOM
MT WOW
MT ZIRKEL
MUSSIGBROD LAKE
NAOMI PEAK
NAPLES
NEDERLAND
CO
CO
MT
ID
MT
CA
CA
CA
CA
CA
CO
MT
WA
WA
WA
ID
WY
CO
ID
UT
CO
MT
ID
NV
WA
CA
CA
WA
CO
MT
UT
ID
CO
1955
1957/1974
1971
1972
1968
1982
1983
1983
1982
1982
1970
1968
1969
1963
1963
1962
1968
1980
1966
1967
1957/1977
1968
1967
1968/1982
1969
1983
1982
1971
1955
1977
1969
1965
1972
                                 210

-------
(continued)
Table 3-2  (continued)
NELSON MTN
NEW FORK LAKES
NIMROD
NORTH FORK
NORTH PALISADES
NORTH POLE
NYACK
ODELL LAKE
ODELL LAKE
ONION VALLEY
OPHIR
ORNO PEAK
OWEEP CREEK
OYSTER LAKE
PACIFIC VALLEY
PACKSADDLE MTN
PADDY FLAT
PALISADES DAM
PALISADES PEAK
PALOMINO MTN
PAONIA
PARADISE BASIN
PARADISE PARK
PARK RESERVOIR
PASAYTEN PEAK
PICKEL MEADOW
PIKE LAKE
PINGREE  PARK
PIPER-CROW PASS
PITCHPINE MTN
PLACERVILLE
PLATORO
PORCUPINE RIDGE
CA
WY
MT
CA
CA
ID
MT
MT
OR
CA
CO
CO
UT
CO
CA
OR
ID
ID
ID
CO
CO
WY
UT
WY
WA
CA
MT
CO
MT
CO
CO
CO
MT
1983
1967
1958/1980
1965/1981
1982
1979
1964
1978
1963/1981
1950
1955
1977
1967
1977
1979
1963/1981
1973
1966
1966
1973
1965/1979
1952
1965
1965
1969
1954/1978
1968
1962/1977
1965
1955
1953
1967
1968
                                211

-------
(continued)
Table 3-2  (continued)
POWDER RIVER PASS
POZEGA LAKES
PRINTZ RIDGE
PROSPECT PEAK
PYRAMID PEAK
RAID LAKE
RAMEY HILL
RAMMEL MTN
RANGER PEAK
RASMUSSEN LAKES
RED CINDER
RED FEATHER LAKES
RED MEADOW LAKE
RED TOP MTN
RENO HILL
RHODES PEAK
RIO GRANDE PYRAMID
RIPPLE CREEK
RITO ALTO PEAK
ROBERTS MTN
ROCK LAKE PEAK
ROCKBOUND VALLEY
ROCKPORT
ROCKY PEAK
ROMAN NOSE
ROSS DAM
ROYAL GORGE
RUNNING LAKE
SADDLE MTN
SAND LAKE
SAND POINT
SCENIC
SEELEY LAKE EAST
WY
MT
MT
WY
CA
WY
ID
WY
ID
UT
CA
CO
MT
WY
WY
ID
CO
CO
CO
WY
WY
CA
WA
CO
ID
WA
CA
ID
ID
WY
CO
WA
MT
1967
1971
1966
1980
1955/1969
1981
1962
1968
1964
1965
1979
1967
1966
1980
1960
1966
1964
1977
1980
1981
1980
1955/1969
1966/1982
1962
1967
1963
1953/1979
1966
1966
1961
1966
1965/1982
1965
                                 212

-------
(continued)
Table 3-2 (continued)
SEVEN TREE FLAT
SHEEP HILL
SHEEPEATER MTN
SHELL LAKE
SHELL RESERVOIR
SIERRA CITY
SILVER BUTTE PASS
SILVER KING MTN
SIMPSON LAKE
SKAGIT PEAK
SKOOKUM CREEK
SKYWAY
SLIGO PEAK
SLOAN PEAK
SMITH PEAK
SNOQUALMIE
SNOQUALMIE LAKE
SNOW LAKE
SNOWKING MTN
SNOWMASS MTN
SNOWYSIDE PEAK
SODA SPRINGS
SONNY BOY LAKES
SOUTH BALD MTN
SOUTH LAKE TAHOE
SPICER MEADOW RESERVOIR
SQUARETOP MTN
SQUAXIN ISLAND
ST ELMO
ST. JOSEPH PEAK
STANLEY LAKE
(continued)
UT
ID
ID
WY
WY
CA
MT
MT
WY
WA
WA
CO
CA
WA
ID
WA
WA
WY
WA
CO
ID
CA
WA
CO
CA
CA
WY
WA
CO
MT
ID
1972
1978
1979
1960
1964
1981
1966/1983
1968
1968
1969
1968/1981
1955
1982
1966/1982
1969
1953/1968
1965/1982
1956
1966/1982
1960/1982
1964
1955/1979
1963/1982
1967
1955/1982
1979
1968
1959/1968
1982
1964
1972
                                 213

-------
Table 3-2(continued)
STEVENS PASS
STORM KING PEAK
STORRIE
STRAWBERRY VALLEY
STRIPE MTN
STRYKER
STUART PEAK
SULTAN
SUN MTN
SWAMP CREEK
SWAN PEAK
SWEDE GULCH
SWEETWATER GAP
SWEETWATER LAKE
SWEETWATER NEEDLES
TATOOSH BUTTES
TAYLOR MTN
TELLURIDE
TEMPLE PEAK
TENMILE LAKE
THE CRADLE
THE WIGWAMS
THOMPSON PEAK
THOMPSON PEAK
TIN CUP LAKE
TIN CUP LAKE
TINCUP
TORREY MTN
TOSI PEAK
TRAIL RIDGE
TRAPPER PEAK
TRAPPERS LAKE
TREASURE MTN
(continued)
WA
CO
CA
CA
ID
MT
MT
WA
WA
MT
MT
MT
WY
CO
WY
WA
ID
CO
WY
MT
WA
ID
CA
ID
MT
MT
CO
MT
WY
CO
MT
CO
MT
1965
1964
1979
1948/1975
1979
1963/1983
1965
1953/1968/1973
1969
1968
1965
1968
1953
1977
1969
1969
1963
1955
1969
1964
1965
1967
1979
1966
1984
1964
1982
1952
1967
1957/1977
1964
1977
1963
                                 214

-------
Table 3-2  (continued)
TRINITY DAM
TRUCKEE
TURPIN RESERVOIR
TURQUOISE LAKE
TWIN PEAKS
UKONOM LAKE
UNION PEAK
VAIL EAST
VAIL PASS
VAUGHN
VICTORIA LAKE
WAHOO PEAK
WALKER MTN
WALUPT LAKE
WARBONNET PEAK
WARD
WARD MTN
WARREN PEAK
WASHAKIE PARK
WASHINGTON PEAK
WATCHTOWER PEAK
WENTWORTH SPRINGS
WEST FORK LAKE
WESTWOOD WEST
WHEELER PEAK
WHITE  RIVER PARK
WHITE  SAND LAKE
WHITEROCKS LAKE
WIDOW MTN
WILKESON
WILLOW LAKES
WILLOW PARK RESERVOIR
WOOD HUMP
(continued)
CA
CA
WY
WY
CO
CA
WY
CO
CO
WA
CO
ID
WY
WA
ID
CO
MT
MT
WY
ID
MT
CA
CO
CA
NM
WA
ID
UT
ID
WA
CO
WY
ID
1982
1955/1969
1961
1965
1965
1980
1968
1970/1982
1970
1953/1968
1984
1966
1964
1970
1972
1957/1978
1964
1962
1981
1964
1966
1953/1973
1962
1980
1963
1971
1966
1963
1969
1956/1968
1970
1967
1962
                                 215

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Table 3-2 (continued)
WOODFORDS                       CA                           1979
WOODLAND PARK                  CO                           1954/1976
                                   216

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                                    SECTION 4

                  MAPS SHOWING LAKE LOCATIONS BY STATE

    During the WLS-I, lakes were sampled in ten states. Figures 4-1 to 4-10 show locations of
the sampled lakes within each  state.  Subregion boundaries,  as appropriate, are included.
Lakes selected as part of the probability sample are designated as open squares; special interest
lakes are shown as plus symbols.
                                        217

-------
           D Regular Lakes
           + Special Lakes
Figure 4-1   Sampled lakes in California, Western Lake Survey - Phase I.
                                  218

-------
                                                                     CO
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                                             219

-------
D Regular Lakes
-+- Special Lakes
4-3    S,p,,d
                     220

-------
                                                cu
                                                 I
                                                WJ
                                                1
                                                i
                                               3
                                               J2
                                                00
                                               '
221

-------
                          D Regular Lakes
                          + Special Lakes
Figure 4-5   Sampled lakes in Nevada, Western Lake Survey - Phase I.
                              222

-------
                                          D Regular Lakes
                                          + Special Lakes
Figure 4-6   Sampled lakes in New Mexico, Western Lake Survey - Phase I.

                                   223

-------
CD 
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en
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224

-------
    D Regular Lakes
    + Special Lakes
Figure 4-8   Sampled lakes in Utah, Western Lake Survey - Phase I.
                               225

-------
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226

-------
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                                              227

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                                     SECTION 5

                  LAKES SAMPLED AND INDIVIDUAL LAKE DATA

     The primary goal of the WLS-I was to develop a geographically extensive data base that
could be used as an initial framework to quantify the extent and chemical status of lakes in the
western United States potentially at risk due to the effects of acidic deposition. The design of
the Survey emphasized that characteristics of populations of lakes, not individual lakes, were to
be described, in accordance with the Survey's primary goal. In order to maximize the number of
lakes that were sampled and the geographical coverage, a single sample was collected from each
lake.  The sample was collected during fall turnover when one sample could best represent the
whole lake and the entire fall season; (Volume I, Section 2.5), however, the data should not be
construed  to completely characterize the chemistry of any particular lake. The data presented
in this section must be viewed only as an index to the chemistry of any individual lake.
     This  section  presents the names, locations, and sample  data for each probability sample
lake  and each special-interest lake sampled during the WLS-I.  To use these data in inferring
characteristics of lake populations requires that the Survey design be appropriately applied.
Furthermore, the  data for special interest lakes  cannot be used to draw conclusions about lake
populations because these lakes were not selected as part of the probability sample (Volume I,
Section 2.2.1).
     Table 5-1  contains an alphabetical listing  of the variables reported in this section. The
units space,the  variable names as they appear in the data base, and brief definitions and/or
descriptions of the methods used are also included. More extensive descriptions are given in
Volume I, Section 2.5 and in Kerfoot  and Faber (1986).
5.2  PROBABILITY SAMPLE LAKES
5.2.1  List of Probability Sample Lakes Sorted bv State and Lake Name.
     Table 5-2 lists all lakes that were part of the probability sample sorted by state and lake
name. Table 5-2 includes:  the name of the state in which the lake is located, the lake name as
it appears on the appropriate map, the lake ID  as described in Section 5.2.2, the latitude and
longitude (in degrees-minutes-seconds), and the map on which the lake is found.
5.2.2 List of Probability Sample Lakes Sorted bv Lake ID
     Table  5-3 lists all lakes that  were part of the  probability  sample sorted by lake
identification code (Lake ID).  Each lake ID  is  a unique seven-character code.  The first
character identifies  the region in  which  the lake is located (4); the second character,  the
subregion (A through E); the third character, the alkalinity map class (1, 2, or 3); the  fourth
character, a dash; and the last three, the assigned lake number.  A lake with the ID of 4A1-010
                                          228

-------
is located in subregion A (California) of region 4 (the west) was selected from alkalinity map
class 1 (<100 ueq L"1), and is the tenth lake numbered in this group. Some lakes were dropped
in the selection process or were not sampled (Volume I, Section 2.2); therefore, the assigned
lake numbers are not consecutive.  For a description of the lake selection process, see Volume
I, Section 2.2.
    The additional information provided in Table 5-3 includes lake name as it appears on the
USGS map; the  name  of  the state in which the lake is located (given as the  two-character
postal code); latitude and longitude (in degrees-minutes-seconds); and the size and name of the
large  scale  USGS topographic map on which  the lake is found.  The  maps listed are those
actually used to locate and characterize the selected lakes.
5.2.3  Data for Individual Probability Sample Lakes
    The data for individual lakes selected as part of the probability sample in the WLS-I are
presented in Table 5-4, sorted  by the Lake ID shown for each entry in the upper left hand
corner.
    The values shown in  Table 5-4 represent the data as they appear in the final WLS-I data
set (Data Set 4; Volume I, Section 3.4).  These values  were used  to compute the population
estimates given in Volume I (Sections 5 through 9) with the algorithms specified in the Survey
design (Volume I, Section 2.3).
    The raw data for the variables presented here and  in section 5.3.3 have been modified as
follows:
    o negative values measured for variables other  than ANC have been set to zero;
    o 2 missing values have been substituted with synthetic values;

    o 54 suspected analytical  errors have been replaced with synthetic values; and
    o measurements for 215 duplicate lake samples have been averaged (Volume I, Section 3.4
       and Eilers et al. 1986).
    Individual wishing to use unmodified data should request the validated data set (Data Set 3,
described in Volume I, Section  3.3). Information on availability of all data is provided in  the
Notice (page  ii).
5.3 SPECIAL INTEREST LAKES

5.3.1  List of Special  Interest Lakes Sorted bv State and Lake Name
    Table  5-5 lists all special interest lakes (those  not part of the probability sample), sorted
by state  and  lake name.  Table  5-5 includes:  the  name  of the state in which the  lake is
located, the lake name as it appears on the appropriate USGS map, the lake ID as described in
                                         229

-------
Section 5.2.2, the latitude and longitude (in degrees-minutes-seconds), and the map the lake is
found  on.
5.3.2  List of Special Interest Lakes Sorted bv Lake ID
     Table 5-6 lists all special interest lakes sorted by Lake ID.
     The information provided in Table 5-6 includes lake name as it appears on the USGS map;
the name  of the state in which the lake is located (given as the two-character postal code);
latitude and longitude (in degrees-minutes-seconds); and the size and name of the large scale
USGS topographic map on which the lake is found.  The maps listed are those actually used to
locate and characterize the selected lakes.

5.3.3  Data for Individual Special Interest  Lakes
     The data for individual special interest lakes, sorted by the Lake ID shown in the upper
left hand corner, are presented in Table 5-7. The values shown in Table 5-7 are presented as
they appear in the final data set (Data Set 4).  Individuals wishing  to use unmodified data
should request the validated  data  set (Data   Set  3, described in  Volume I, Section 3.3).
Information on availability of all data is provided in the Notice (page ii).
                                         230

-------
Table 5-1  Description and Definition of Parameters Presented as Sample Values, Western Lake
           Survey - Phase I
Parameter (unit)
Data Base Name
        Description/Definition
ANCCueqL'1)
   ALK.A11
Ca (ueq L'1)
   CA16
Cal. Cond. (uS cm'1)    CONCAL
Acid neutralizing capacity is a measure of the amount
of  acid  necessary  to  neutralize  the  bicarbonate,
carbonate, hydroxyl, and other bases in a sample.  Acid
neutralizing  capacity was measured in the analytical
laboratory in an  unfiltered, unacidified aliquot, using
acidimetric titration and modified Gran analysis (Hillman
et al. 1986; Kramer  1984).

Calcium was measured in the analytical laboratory in a
filtered, acidified (HNC^) aliquot (EPA  215.1, AAS,
flame). Values were converted from mg L~* to ueq L"1
for data analysis.

Calculated   conductance  is  the  product  of  ion
concentration and equivalent conductance summed over
all  ions  measured.    It  is  calculated  here  as:
(59.47[Ca+2] + 53.0 [Mg+2] + 73.48 [K+] + 50.08 [Na+] +
73.5 [NH4+] + 349.65 [H+] + 80.0 [SO4-2] + 44.5 [HCO3']
+ 76.31 [Cr] + 71.42 [NOs'l + 55.4 [F'] + 69.3 [COf2] +
198 [OH"])/1000. This calculation converts units from
ueq L"1 to uS cm"1. [H+] is computed from PHAC (the
open system pH measurement at the  initiation of the
acidity titration).
Cations/Anions
CHueqL'1)
   ANCAT      Cations/anions is the sum of measured cations divided
                by the sum of measured anions.

   CL16        Chloride ion was measured in the analytical laboratory
                in an aliquot from a filtered, unacidified sample (ASTM
                1984; O'Dell et al. 1984, ion chromatographic methods).
                Values were converted from mg L"1  to ueq  L"1  for
                data analysis.
                                        231

-------
  Parameter names shown here are consistent with those shown in Tables 5-4 and 5-7. Names
shown in  Table 2-1  and Figures 2-1 to 2-162 differ slightly for some  variables.  When
cross-referencing between this table and Table 2-1, the data base name should be used.
(continued)
                                        232

-------
TABLE 5-1.  (Continued)
Parameter (unit)      Data Base Name
                    Description/Definition
Closed DIC (mg L-1)   DICVAL
             Dissolved inorganic carbon was measured in the field
             laboratory.  The sample was  drawn directly into a
             syringe from the Van Dorn water sampler at the lake
             site, filtered, and  analyzed,  without exposure to the
             atmosphere, using  a Dohrmann model DC-80 carbon
             analyzer with an infrared spectrophotometric detector
             (EPA 415.2, modified).
Closed pH
PHSTVL     Closed system pH was measured in the field laboratory
             using an Orion model 611  meter and an Orion Ross
             combination pH electrode in a syringe sample unexposed
             to the atmosphere (EPA 150.1).
Color (PCU)
Date
DOC (mg L"1)
COLVAL    True color is a measure of the dissolved and colloidal
             substances in water that reduce light  transmission.
             True color was measured in the field laboratory in a
             centrifuged aliquot (to remove particles), using a Hach
             model CO-1 Comparator (EPA 110.2, modified).

DATSMP    Date sampled is the date on which the lake sample was
             collected.

DOCl 1       Dissolved organic carbon was measured in the analytical
             laboratory in a filtered, acidified (I^SO^ aliquot (EPA
             415.2, infrared spectrophotometric detector).
Elevation (m)
ELEV       Elevation of the lake surface was determined from USGS
             topographic maps or was estimated from topographic
             contour lines.
(continued)
                                        233

-------
TABLE 5-1.  (Continued)
Parameter (unit)
                    Data Base Name
Description/Definition
Equil. DIG (mg L-1)    DICE 11
                                    Air-equilibrated dissolved inorganic carbon was measured
                                    in the analytical laboratory in an unfiltered, unacidified
                                    aliquot bubbled  with 300  ppm  CC>2, drawn into a
                                    syringe, filtered, and analyzed without exposure to the
                                    atmosphere   (EPA   415.2   modified,    infrared
                                    spectrophotometric detector).
Ext. Al (ug L'1)
Equil. pH              PHEQ11      Air-equilibrated pH was measured in  the  analytical
                                    laboratory in an unfiltered, unacidified aliquot bubbled
                                    with 300 ppm C(>2 (EPA 150.1, electrode).

                       ALEX 11     Extractable aluminum is an estimate of labile, monomeric
                                    aluminum. Aluminum in an unacidified, filtered sample
                                    was complexed with 8-hydroxyquinoline and extracted
                                    with methyl-isobutyl ketone  (MIBK) in  the  field
                                    laboratory.  The extract was analyzed in the analytical
                                    laboratory using the method described in Hillman et al.
                                    (1986). Values were converted from mg L"1  to ug L"1
                                    for data analysis.

F (ueq L'1)            FTL16       Total dissolved fluoride was measured in the analytical
                                    laboratory in a filtered, unacidified aliquot, using an
                                    ion-selective electrode (ISE,  EPA 340.2, modified).
                                    Values were converted from mg L"1 to ueq L"1 for data
                                    analysis.
(continued)
                                         234

-------
TABLE 5-1.  (Continued)
Parameter (unit)     Data Base Name
                                          Description/Definition
Fe (ug L'1)
                      FEU
HCO3 (ueq L"1)       HCC>3l6
                                  Dissolved  iron  was  measured  in  the  analytical
                                  laboratory, in a filtered, acidified (HNO3) aliquot (EPA
                                  236. 1 , AAS, flame). Values were converted from mg L" ^
                                  to ug L"* for data analysis.

                                  Bicarbonate is estimated as follows:  HCO316 - 83.26
                                  (DICI1 1) Ki/dH4]2 + [H+]K! + Kj K2); where [H+] -
                                  10-pHACll;K1-4.3E-07,K2-5.61E-ll,DICIllis
                                  the unequilibrated DIG, and PHAC1 1 is the initial acidity
                                  titration pH.
Hydro. Type
                      HYDROTYP Hydro,  type is the lake hydrologic type, determined
                                   from USGS topographic maps:
                                   SEEPAGE has no inlet(s) or outlet(s)
                                   DRAINAGE has outlet(s)
                                   CLOSED has inlet(s) but no outlet(s)
                                   RESERVOIR manmade impoundment
ID
K (ueq L'1)
(continued)
                      LAKEID
                      K16
                                   Lake ID is a seven-character, unique identification code
                                   assigned to each lake.  The first character is a digit
                                   representing the region (1, 2, or 3); the second is a
                                   letter indicating the subregion;  the third is a  digit,
                                   giving the alkalinity map class; and the fourth, a dash.
                                   The last three digits are the assigned lake number.

                                   Dissolved potassium was measured in the analytical
                                   laboratory in a filtered, acidified (HNC>3) aliquot (EPA
                                   Method 258.1 , AAS, flame). Values were converted from
                                   mg L'1 to ueq L"1 for data analysis.
                                       235

-------
TABLE 5-1.  (Continued)
Parameter (unit)     Data Base Name
                    Description/Definition
Lake Area (ha)
LAKE_SIZ  Lake surface area was measured on large scale USGS
            topographic maps using an electronic planimeter.
Latitude
LAT
Latitude was read from the USGS topographic maps in
DD-MM-SS (degrees-minutes-seconds) format.
Longitude
LONG      Longitude was read from the USGS topographic maps in
            DDD-MM-SS format.
Meas. Cond. (uS cm'1)  COND11
Mg (ueq L'1)
Mn(ugL-*)
 Na (ueq L'1)
            Conductance is a measure of the resistance of a water
            sample to an electrical  current.   Conductance  was
            measured  in  the  analytical  laboratory  using  a
            conductivity cell (EPA 120.1).
MG16       Dissolved magnesium was measured in the analytical
             laboratory in a filtered, acidified (HNOj) aliquot (EPA
             242.1, A AS, flame or furnace). Values were converted
             from mg L~* to ueq L"* for data analysis.

MN11       Dissolved manganese was measured in the analytical
             laboratory in a filtered, acidified (HNC^) aliquot (EPA
             243.1, A AS, flame). Values were converted from mg L" *
             to ug L"1 for data analysis.

NA16       Dissolved  sodium was  measured in  the  analytical
             laboratory in a filtered, acidified (HNC^) aliquot (EPA
             273.1, AAS, flame). Values were converted from mg L"J
             to ueq L"1 for data analysis.
 Name
 LAKENAMELake name was taken from the USGS topographic maps
             or,  in  some  cases, substituted with  more  recent
             information from state sources.  When a number of
                                        236

-------
TABLE 5-1.  (Continued)
NH4 (ueq L'1)
NH416
NO3 (ueq L'1)
NO316
Residence Time (yr)    RT
small water bodies were identified by only one name on
the map, a qualifier was added to the name, such as
"southern," to identify the lake sampled. When no name
was  listed, "(NO NAME)"  was entered into the data
base as the lake name.

Ammonium ion was measured in the analytical laboratory
in an unfiltered, acidified (f^SC^) aliquot (EPA 350.1,
colorimetric, automated). Values were converted from
mg L"1  to ueq L'1 for data analysis.

Nitrate ion was measured in the analytical laboratory in
a filtered, unacidified aliquot, using ion chromatography
(ASTM 1984; O'Dell et al. 1984). Samples taken before
November 2,1984, were analyzed in a slightly different
manner  (see Volume I, Section 3.5.2).  Values were
converted  from mg L"1 to ueq L"1  for data analysis.

Residence time is the estimated hydraulic residence
time, defined as years required to replace the volume
of the lake. RT - (LAKE_SIZ) 0.464 (SITDPM)/2.54 E-2
(RUNIN)(WSHED - LAKEJSIZ) + LAKE_SIZ (PRECIP);
where RUNIN - runoff (inches/yr) interpolated from
national runoff maps and PRECIP - precipitation (m/yr)
interpolated from  National  Weather  Service  Data.
Residence time was not computed for seepage or closed
lakes.
(continued)
                                        237

-------
TABLE 5-1.  (Continued)
Parameter (unit)     Data Base Name
                     Description/Definition
Sample Type
RG_SPC   Sample type indicates whether the lake sampled was a
             probability sample (REGULAR) or special interest lake
             (SPC). SPC/LTM designates lakes that were part of the
             EPA Long-Term monitoring project.
Secchi Depth (m)
SiO2 (mg L'1)
SECMEAN   Secchi disk transparency was determined by averaging
             the   depths   of  Secchi   disk   disappearance  and
             reappearance. When the Secchi disk was visible on the
             lake bottom, that value was entered.

SIO211       Silica was measured in the analytical laboratory in an
             unfiltered  aliquot  (USGS 1-2700-78,  colorimetric,
             molybdate blue, automated method).
Site Depth (m)
SO4 (ueq L'1)
State
SITDPM
S0416
ST
Site depth is the depth in meters of the sampling site,
measured using a weighted line, and is not necessarily
the maximum lake depth.

Sulfate ion was measured in the analytical laboratory in
the filtered aliquot, using ion chromatography (ASTM
1984; O'Dell et al. 1984).  Values were converted from
mg L"1 to ueq L"1 for data analysis.

State is the state in which the lake is located, indicated
as the standard two-character postal state abbreviation.
(continued)
                                         238

-------
TABLE 5-1.  (Continued)
Parameter (unit)      Data Base Name
                    Description/Definition
Stratified
STRAT
                             ,**
Sum Anions (ueq IT1)  ANSUM
Sum Cations (ueq L"1)  CATSUM
Surface Temp.
TMPTOP
Tot. Al (ug L-1)
ALTL11
Stratified indicates whether the sampled lake was mixed
(MIXED), strongly (STRONG)  stratified  or weakly
(WEAK) stratified.    The  stratification status  was
determined as follows: MIXED indicates lakes where
the difference between top temperature and bottom
temperature was < 4C. STRONG indicates lakes with a
temperature difference  >  4C  between  the  top
temperature and the temperature at 60 percent depth.
WEAK indicates lakes where the temperature difference
between top and bottom was > 4C but < 4C between
top and the 60 percent-depth temperature.

The sum of anions was calculated for measured anions
as: HCO3- + CO3~2 + CP + NO3~ + SO4~2 + F'1 + OH

The sum of cations was calculated for measured cations
as: Ca+2 + Mg+2 + K+ + Na+ + NH4+, + H+ [where H+
is calculated from the open system pH measured at the
beginning of the acidity titration (PHAC)].

Surface  temperature is the lake water temperature at
1.5 m, measured using the  Hydrolab model 4041 probe
from the helicopter.

Total  aluminum  was  measured  in  the  analytical
laboratory in an unfiltered, acidified (HNO3) aliquot
(EPA  202.2,  AAS,  atomic  absorption  spectroscopy,
graphite furnace).  Values were converted from mg L~J
to ug L'1 for data analysis.
**Not to be confused with the term strata in the ELS-I design.
(continued)
                                        239

-------
TABLE 5-1.  (Continued)
Parameter (unit)     Data Base Name
                    Description/Definition
Tot. P (ug L'1)
PTL11
Turbidity (NTU)
WA/LA
TURVAL
WALA
Watershed Area (ha)     WSHED
Total  phosphorous was measured  in  the analytical
laboratory in an unfiltered, acidified (H2SO4) aliquot,
using   either   of  two   automated,   colorimetric,
phosphomolybdate methods:  for normal  phosphorus
levels, using a 15-mm absorption cell, or for low levels,
a preliminary method using a 50-mm absorption cell
(USGS1-4600-78). Values were converted from mg L"1
to ug IT* for data analysis.

Turbidity was measured in the field laboratory, using a
Monitek   model   21  nephelometer,   reported   in
nephelometric turbidity units (EPA 180.1).

WA/LA is the ratio of watershed area to lake area.

Watershed area, which includes lake area, was measured
on large  scale  USGS topographic maps using  an
electronic planimeter.
                                         240

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