U.S. ENVIRONMENTAL PROTECTION AGENCY
           NATIONAL EUTROPHICATION  SURVEY
                    WORKING PAPER SERIES
                                           REPORT
                                             ON
                                          LAKE POWELL
                                    COCONINO COUNTY, ARIZONA
                                      GARFIELD, KAf€, /W)
                                     SAN JUAN COUNTIES. UTAH
                                      EPA REGIONS VIII & IX
                                      WORKING PAPER No. 733
 CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
                              and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA

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                               REPORT
                                ON
                             LAKE POWELL
                      GOCONINO COUNTY, ARIZOW
                        GARFIELD, KANE, Af)
                       SW JUAN COUNTIES, UTAH
                        EPA REGIONS VIII ft IX
                        WORKING PAPER No. 733
    WITH THE COOPERATION OF THE
ARIZONA STATE DEPARTMENT OF HEALTH
              AND THE
      ARIZONA NATIONAL GUARD
           AUGUST, 1977

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            REPORT ON LAKE POWELL

          COCONINO COUNTY, ARIZONA

  GARFIELD, KANE, AND SAN JUAN COUNTIES, UTAH

            EPA REGIONS VIII & IX


                     by

       National Eutrophication Survey

        Water and Land Quality Branch
       Monitoring Operations Division
Environmental Monitoring & Support Laboratory
              Las Vegas, Nevada

                     and

           Special Studies Branch
 Corvallis Environmental Research Laboratory
              Corvallis, Oregon
            Working Paper No. 733
     OFFICE OF RESEARCH AND DEVELOPMENT
    U.S. ENVIRONMENTAL PROTECTION AGENCY

                August 1977

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                                   1

                               CONTENTS
                                                         Page
Foreword                                                  i i
List of Arizona Study Lakes                               1v
Lake and Drainage Area Map                                 v
Sections
  I.  Conclusions                                          1
 II.  Lake and Drainage Basin Characteristics               3
III.  Lake Water Quality Summary                           5
 IV.  Nutrient Loadings                                   30
  V.  Literature Reviewed                                 33
 VI.  Appendices                                          34

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                                  11


                               FOREWORD
     The National Eutrophication Survey was Initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.

OBJECTIVES

     The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concen-
trations, and impact on selected freshwater lakes as a basis for
formulating comprehensive and coordinated national, regional, and
state management practices relating to point source discharge
reduction and nonpoint source pollution abatement 1n lake water-
sheds.

ANALYTIC APPROACH

     The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts
that:

     a.  A generalized representation or model relating
         sources, concentrations, and Impacts can be
         constructed.

     b.  By applying measurements of relevant parameters
         associated with lake degradation, the generalized
         model can be transformed into an operational
         representation of a lake, its drainage basin, and
         related nutrients.

     c.  With such a transformation, an assessment of the
         potential for eutrophication control can be made.

LAKE ANALYSIS

     In this report, the first stage of evaluation of lake and
watershed data collected from the study lake and its drainage
basin is documented.  The report is formatted to provide state
environmental agencies with specific information for basin
planning [§303(e)], water quality criteria/standards review
[§303(c)], clean lakes [§314(a,b)], and water quality monitoring
[§106 and §305(b)] activities mandated by the Federal Water
Pollution Control Act Amendments of 1972.

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     Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condition
are being made to advance the rationale and data base for refine-
ment of nutrient water quality criteria for the Nation's freshwater
lakes.  Likewise, multivariate evaluations for the relationships
between land use, nutrient export, and trophic condition, by lake
class or use, are being developed to assist in the formulation of
planning guidelines and policies by the U.S. Environmental Protection
Agency and to augment plans implementation by the states.

ACKNOWLEDGMENTS

     The staff of the National Eutrophication Survey (Office of
Research and Development, U.S. Environmental Protection Agency)
expresses sincere appreciation to the Arizona State Department
of Health for professional involvement, to the Arizona National
Guard for conducting the tributary sampling phase of the Survey,
and to those Arizona wastewater treatment plant operators who
provided effluent samples and flow data.

     The staffs of the Bureau of Water Quality Control, Environ-
mental Health Services, Arizona State Department of Health, and
the Arizona Game and Fish Department, provided invaluable lake
documentation and counsel during the Survey, reviewed the pre-
liminary reports and provided critiques most useful in the
preparation of this Working Paper Series.

     Major General John G. Smith, the Adjutant General of Arizona,
and Project Officer Colonel Richard A. Col son, who directed the
volunteer efforts of the Arizona National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.

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                                 iv
                    NATIONAL EUTROPHICATION SURVEY
                              STUDY LAKES
                           STATE OF ARIZONA
LAKE NAME
Big Lake
Fools Hollow Lake
Lake Havasu

Luna Lake
Lyman Lake
Lake Mohave
Lake Pleasant
Lake Powell
Rainbow Lake
Theodore Roosevelt Lake
San Carlos Reservoir
    COUNTY
Apache
Navajo
Mohave (San Bernadino
        in CA)
Apache
Apache
Mohave (Clark in NV)
Yavapai, Maricopa
Coconino (Kane, Garfield,
San Juan in UT)
Navajo
Gil a
Graham, Gila, Pinal

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      X    Uke Sampling Site
}           »          «          V"*

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                    REPORT ON LAKE POWELL,  ARIZONA
                            STORET NO.  0408

I.    CONCLUSIONS
     A.    Trophic Condition:
               Survey data indicate that  Lake  Powell  is  borderline
          between oligotrophic and mesotrophic.   Low chlorophyll  a^
          values, low phosphorus  values,  and only slight oxygen  depres-
          sion were observed  at open lake stations.   Standiford,  et  al.,
          (1973) cite data from Hansmann, Kidd,  and  Gilbert,  who  rate
          the lower basin as  naturally  eutrophic based on productivity
          studies.   For a comparison of Lake Powell's water quality  with
          other Arizona and Utah  lakes  see  Appendix  A.
     B.    Rate-Limiting Nutrient:
               Algal assay results indicate that the reservoir is phos-
          phorus limited.  Inorganic nitrogen  to orthophosphorus  ratios
          obtained from the lake  data are high (N/P  > 25/1),  suggesting
          phosphorus limitation.
     C.    Nutrient Controllability:
               Lake Powell receives water from three major sources,  the
          Colorado, Green, and San Juan Rivers,  and  several minor
          streams.   These rivers  were not monitored  as part of the Survey,
          but some data are available from  USGS  monitoring stations.
          Total phosphorus values  in both the  Green  and  Colorado  Rivers

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 II.  LAKE AND DRAINAGE BASIN CHARACTERISTICS^

      A.   Lake Morphometry:*
                                        2
           1.    Surface area:  653.16 km .
           2.    Mean depth:   51.0 meters.
           3.    Maximum depth:   170.0 meters.
           4.    Volume:  33.304 x 10$ m3.
           5.    Mean hydraulic  retention time:   2  years.

      B.   Tributary and Outlet:**

           1.    Tributaries
 Name and Location
 of Gaging Station

 Colorado River
  at Cisco, Utah
 Green River
  at Green River, Utah
  (includes San Rafael
  River Data)
 Dirty Devil River
  at Hanksville, Utah
 Escalante River
  at Escalante, Utah
 San Juan River
  at Bluff, Utah

           Totals
 Drainage
Area (km3)
   62,678

  109,531



    9,039

      816

   59,570

  241,634
Mean Flow
 (m3/sec)
   173.0

   175.0



     3.5

     0.6

    41.7
% of Total


   43.9

   44.4



    0.9

    0.2

   10.6
   393.8
  100.0
  Table of metric conversion—Appendix B.
 *BUREC. 1966.   All  values based on pool  elevation of 1128 meters
  (3770 feet) above sea level.
**USGS, 1973.  Discrepancy between tributary and  outlet total  drainage
  area is due to location of tributary monitoring sites about  100  kilo-
  meters above the confluence of the tributary and the lake, and because
  the outlet site is approximately 15 kilometers  below Glen Canyon Dam.
  The difference of 11% between inflow and outflow is due  to the rising
  pool elevation during the period of record,  evaporation, and ground
  water recharge into the sandstone bedrock of Lake Powell.

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     2.   Outlet -
Name and Location
of Gaging Station
Colorado River
 at Lees Ferry
 Drainage
Area (km3)
 279,459
Mean Flow
 (m3/sec)
  350.0
% of Total
     1.9
     C.   Precipitation:*
          1.   Average annual:  12 cm.
     D.   Pool Elevation above Sea Level
          1.   January, 1965           1064 meters (3492 feet)
          2.   December, 1969          1088 meters (3572 feet)
                    Increase 1965-
                     1969
          3.   Average for 1975
                24 meters
              1116 meters (3660 feet)
*From National  Park Service circular, based on 8 years  of records
 at Wahweap.

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III.  LAKE WATER QUALITY  SUMMARY
     A.    Collection  Methods
               Lake Powell  was sampled  in  April,  August,  and  November-
          December of 1975  by NES  helicopter  teams.   Due  to the  size
          and morphology of the  lake, adverse weather conditions,  and
          logistic considerations  both  the spring and fall samplings
          were accomplished in two temporally separate periods.   In
          April, Stations 01-08  were sampled  on the  15th  and  16th
          while Stations 09-19 were sampled on the 28th and 29th
          (Figures 1-3). Station  08 was  located  well  out of  the
          Colorado River Channel in the lee of protective bluffs.
          Station 19 replaced Station 08  which was not resampled on
          subsequent visits.  Fall samples were collected at  Stations
          06, 13-16,  and 18 on November 24th  and  25th.  On December 1st,
          2nd, and 3rd,  Stations 01-07, 09-12, 15, 17, 18, and  19  were
          sampled repeating three  earlier stations.   Significant changes
          did occur in the  short interval  between the two fall  sampling
          periods.
               Sample collection was limited  to the  upper 220 feet (67
          meters) of the water column because of  cable length.   Conse-
          quently, data  from deeper waters were not  collected.   J_n situ
          determinations of temperature,  turbidity,  and conductivity
          were made utilizing both analog  and digital  outputs.   Samples
          were collected at selected depths for dissolved oxygen,  pH,

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37C

15'
37C
    GLEN

    CANYON

       DAM
             PAGE
 o
 NAVAJO
 GENERATING x
 STATION    "^


	Lr

                                                       111'
      Figure 1.  Lake Powell and Major Tributaries (top).

              Station Locations, Lake Powell.  Glen Canyon Dam

              to Cathedral Canyon (bottom).

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37°
30'
   HI-
15'
   111'
110° 45'
110° 30'
                                              37°
                                              30'
                                   HALLS
                                       CROSSING
                                             37°
                                             15'
110° 45'
110°30'
       Figure 2.   Station Locations, Lake  Powell.  Cathedral  Canyon
                  to  Halls Crossing.

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      110° 45'
110° 30'
37<
15'
37°
30'
      BULLFROG
         BASIN
                HALLS
                    CROSSING
                          I	L
                                       37°
                                       15'
                                       37°
                                       30'
      110°45'
110° 30'
110° 15'
      Figure 3.  Station Locations, Lake Powell.   Halls Crossing to
                Colorado River.

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and nutrient analysis.   Samples for chlorophyll  a_ and phyto-
plankton samples were composited from several  stations prior
to analysis.  Samples for algal assays were collected during
the spring and fall sampling periods.  These samples were
composited from water collected at each sampling depth and
from up to four stations.  (A more complete discussion of
sampling techniques is  presented in NES Working Paper 175.)
Physical and chemical lake data are presented  in Appendix C
and are summarized in the following table.

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STOREY CODE 0408
         A.  PHYSICAL AND CHEMICAL CHARACTERIS1 . Cls
PARAMETER
TEMPERATURE (DEG CENT)
0.-1.5 M DEPTH
MAX DEPTH«»

DISSOLVED OXYGEN (MG/L)
O.-l.S M DEPTH
MAX DEPTH«»

CONDUCTIVITY  (UMHQS)
O.-l.S M DEPTH
MAX DEPTH«»

PH (STANDARD UNITS)
o.-i.s M DEPTH
MAX OFPTH«»
TOTAL ALKALINITY  (MG/L)
o.-i.s M DEPTH
MAX DEPTH»»

TOTAL P (MG/L)
O.-l.S M DEPTH
MAX DEPTH"

DISSOLVED ORTHO P
0.-1.5 M DEPTH
MAX OEPTH»»

N02*N03 (MG/L)
0.-1.5 M DEPTH
MAX DEPTH"

AMMONIA (MG/L)
0.-1.5 M DEPTH
MAX DEPTH"

KJELDAHL N (MG/L)
O.-l.S M DEPTH
MAX DEPTH"

SECCHI DISC
rgo
ENT)
8
4
MG/L)
8
4
S)
8
4
)
8
4
MG/D
R
4
8
4
(MG/L)
8'
4
8
4
8
4
8
4
( 4/15/75
RANGE MEDIAN
9.3- 11.0
6.5- 7.6
9.4- 10.0
5.8- 9.4
576.- 600.
637.- 658.
7.8- 8.4
7.7- 8.0
124.- 131.
135.- 154.
0.010-0.017
0.007-0.014
0.011-0.014
0.011-0.019
0.360-0.400
0.390-0.660
0.020-0.030
0.020-0.020
0.200-0.400
0.200-0.400
9.9
6.9
9.6
6.1
580.
651.
8.3
7.8
130.
149.
0.011
0.010
0.012
0.015
0.375
0.640
0.0?0
0.020
0.300
0.350
MAX
DEPTH
RANGE
(METERS)
0.0-
42.7-
0.0-
42.7-
0.0-
42.7-
0.0-
4?.7-
n.o-
42.7-
0.0-
42.7-
0.0-
42.7-
0.0-
4?.7-
0.0-
42.7-
0.0-
42.7-
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
N»
6
3
5
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
{ 8/14/75
S»«« = 3
HAN6E MEDIAN
23.4- 25.3
4.7- 6.9
7.6- 9.0
5.6- 7.2
879.- 945.
583.- 690.
8.5- 8.8
7.8- 8.0
113.- 133.
125.- 140.
0.007-0.011
0.007-0.016
0.008-0.013
0.003-0.019
0.170-0.220
0.500-0.540
0.020-0.040
0.030-0.040
0.200-0.200
0.200-0.200
24.4
5.9
8.0
6.8
937.
656.
8.6
7.9
126.
136.
0.009
0.009
0.009
0.010
0.175
0.540
0.030
0.040
0.200
0.200
MAX
DEPTH
RANGE
(METERS)
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
N*
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
t 12/ 2/75
S»»« = 3
RANGE MEDIAN
11.7- 13.2
7.0- H.7
6.4- 7.2
2.8- 6.6
526.- 537.
503.- 542.
8.0- 8.1
7.6- 7.9
121.- 126.
120.- 147.
0.006-0.010
0.006-0.012
0.002-0.002
0.002-0.004
0.270-0.310
0.260-0.560
0.020-0.020
0.020-0.020
0.200-0.200
0.200-0.200
12.2
7.4
6.9
6.4
530.
511.
8.0
7.8
125.
138.
0.008
0.006
0.002
0.002
0.275
0.530
0.020
0.020
0.200
0.200
MAX
DEPTH
RANGE
(METERS)
0.0-
41.1-
0.0-
41.1-
0.0-
41.1-
0.0-
41.1-
0.0-
41.1-
0.0-
41.1-
0.0-
• 1.1-
0.0-
0.0-
•1.1-
0.0-
-1.1-
1.5
67.1
1.5
67.1
1.5
67.1
US
67.1
1.5
67.1
1.5
67.1
1.5
67.1
1.5
67.1
1.5
67.1
1.5
67.1
                           5.0-  7.0
5.3
                                                               4.6-  5.2
4.6
                                                            6.4- 15.2
                                                                                                                 7.6
                         » N = NO. OF SAMPLES
                         «« MAXIMUM DEPTH SAMPLED AT EACH SITE
                         «*« S = NO. OF SITES SAMPLED ON THIS DATE

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                                  11
B-    Physical  Properties
     1.    Main Channel
               Profiles and cross sections  of temperature,  dissolved
          oxygen, and conductivity along  the  axis  of the  Colorado
          River Channel are presented in  Figures 4 through  13.   Tem-
          perature and conductivity profiles  are reproduced from
          continuous analog records; those  for dissolved  oxygen  are
          interpolated between sampling depths.   In April  (Figure  4)
          the isotherms at depth tend to  rise as you proceed downstream,
          indicative of upward displacement by inflowing  cold, dense
          winter water.  Reynolds and Johnson (1974) report that annual
          cold, saline, advective under flows from the Colorado  River
          occur each winter which "flush" the bottom waters of the
          lake and replace it with cold,  oxygenated water.
               The August profiles (Figure  5) show a relatively  deep,
          well developed thermocline.  The  high surface values at
          Stations 10 and 11 are difficult  to account for.   On the
          cross section (Figure 6) the 8° C isotherm is not encountered
          in the upper basin, indicative  of displacement  by summer
          runoff waters into the upper reaches of the lake.
               In December (Figure 7) mixing is apparent  to 35 to  40
          meters throughout the lower basin.   Very cold water is observed
          at Station 09 but either sinks  below our sampling levels

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                                     12
    DAM 2   1   19
       STATION NUMBERS
IS   14   12          11
10
                                                   TEMPERATURE PROFILE SCALE
                                                     CENTER 8 °C STATION MARK
        Figure 4.  Temperature Profiles  and Cross Section (Isotherms  °C),
                    Lake  Powell Main Channel, April 1975.
                    o- pumped water sample.
  0

  40


. m
u
M20
c

heo

 200

 240
        DAM 2   1  19
           STATION NUMBERS
    15  14   12         11
   10
                               0

                               10

                               20
                                 i
                               30 j

                               40:
                                 I

                               50'

                               w/

                               70

                                 5  10  ,  20
                                 i u in in mm i
                              TEMPERATURE SCALE
                                   CENTER
                              tcr iS'-e
        Figure  5.   Temperature  Profiles,  Lake Powell Main  Channel,
                    August 1975.
                    Station  location (j) and  15°C isotherm  shown for
                    reference;
                    o —pumped water sample.

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                                     13
   0AM 2   1   19
         STATION NUMBERS
 IS   14  12          II    10




40

80

.120

160
OAJ1
200


240


•

-

-

-

-




-

X

SOO1

....
---.
~~~:
-'..
•
,
•--_.


i ** ••


24 *
Sa^N


^ " '
- -
^ -.

-,
--..,
|V *
\
S



1
	 25-----'

Rffl?3]HPK?SSOT
- - -"_"."-"- "- "f 1 1
-~~~'.'---~--~"
"" - — — ^ "" "* ^ —
~-~—-w -".'_'.


_^*~***
-.^---'

i


/
/
*

^®
^X^ ^
*o~.
-^__~
— -'








^ 1
*<•*

•»^^ * •
z~— -
	
-~II
**!•;
	




i


i *
3— V25— -

iff-V=J==H
~~~~~- ""."-"-•
~-~~~~.~-~-~-~~~-
»* * * ^ *
*— <• * ^
** '
--*1"* /'
S*



\


^ f *
.--"*

	 ~--*
!*f*^0 "" " *" *** V" "*
:.T)5
--;
r*'












{ .

-
-

-
-


-

0


in
IU
20

30 o
-4
40 =
m
503
GO
60


70

        Figure 6.   Temperature Cross  Section (Isotherms  °C),
                    Lake Powell Main Channel, August  1975.
                    Vertical lines  indicate station location and
                    depth of profile records.
    DAM 2   1   19
       STATION NUMBERS
15   14   12          11
10
  0


 40


• 80
l

^120
I

 160


 200


 240
                  i
                        	10—
                                    5   10  I5°C1
            TEMPERATURE -
            PROFILE SCALE
            CENTER 10°C  -
            UNDER STATION
            MARK
0


10


20.
  r

30J
  *S

40 i
  I

50

60
                                                 33
                                                 t/>
        Figure  7.   Temperature  Profiles and Cross Section (Isotherms  °C),
                    Lake Powell  Main  Channel, November-December 1975.
                    Solid profiles  were obtained  in  December, dotted
                    profiles in  November; o- pumped water sample.

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                                   14
 or is mixed quite rapidly since only a hint of its presence is noted
 at Station 05.   A third hypothesis would be that it represents a cold
 water "slug" that has not yet progressed downstream to Station 05.
      Conductivity profiles and cross sections along the main axis of
 Lake Powell are shown in Figures 8, 9, and 10.   Conductivity values
 indicated are ambient; they have not been adjusted to 25  C*.
      In April (Figure 8) high conductivity isopleths in the upper
 reaches of the lake extrapolate to below the maximum sample depth
 at downstream sites, again suggesting a dense water flow into  the
 bottom layers of the lower basin.   The higher surface conductivity
 values at Station 05 probably reflect the two week interval  between
 sampling of Station 05 and adjacent stations.
      Summer surface conductivities (Figure 9) are very high because
 of warm, saline inflowing surface waters and extensive evaporation.
 If specific conductance values were used, the surface gradient would
 be somewhat less apparent, but high values would still  remain.
      Very low conductance observations at Station 14 during the fall
 sampling (Figure 10) are a result of earlier sampling.   There  was
 little apparent structure remaining in December; however,  relatively
*This adjustment can be approximated  by the  formula  SC25  =  Cj +  .02  (25-T)
 where SC;>5 =  Specific Conductance at 25°  C  and  Cj =  conductance  in
 nmhos/cm at Temperature T in  °C.

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   DAM2  1  19
       STATION NUMBERS
15  14  12         11
10
  40


  80

L120


!160

 200


 240
.'


_

-



.
'


t
1
1






i

''







t 990
-Arr.-.-l. -800—

„ — 600
(






'/


X.
-•






um
uUU
..--
—








•
	 60Q 	




.'''
\
3
'"•/

v


1
.--'
<
> 1 j. iyo'l f

"~-''^f" 9 ) ' ' f
f 600
V. --'.-*'
X' 'I 4 ? 10
7on • iiliiuii
.."" xlOOumhos
CONDUCTIVITY SCALE"
CENTER
6 WITH STATION MARK-
                                                 10

                                                 20

                                                 301

                                                 40 "1
                                                  m

                                                 50 i
                                                 60

                                                 70
        Figure  8.   Ambient Conductivity Profiles  and  Cross Section
                    (Isopleths  in  ymhos). Lake Powell  Main Channel,
                    April 1975.
                    o —  pumped water sample.
     DAM 2   1   19
            STATION NUMBER
    15   14   12          11   10
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        Figure  9.   Ambient Conductivity Profiles  and Cross Section
                    (Isopleths  in  umhos), Lake Powell  Main Channel,
                    August 1975
                    o — pumped water sample.
                                                      o

                                                      10


                                                      20 =
                                                        m
                                                        -o
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                                                      301
                                                        —I
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                                                      50 JS

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                                                      70

-------
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        STATION NUMBERS
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         Figure 10.  Ambient  Conductivity Profiles  and Cross Section
                     (Isopleths in ymhos), Lake  Powell  Main Channel,
                     November-December 1975
                     Solid  profiles were obtained in  December, dotted
                     profiles in November; o —  pumped water sample.
   DAM2   1   19
15
      STATION NUMBERS
    14   12          11
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                                                  60


                                                  70
         Figure 11.  Dissolved Oxygen Profiles  and  Cross Section
                     (Isopleths in mg/liter), Lake  Powell  Main Channel.
                     April  1975.
                     o  —  pumped  water sample.

-------
                                  17
saline water can be seen entering from the north.
     Cross sections and profiles for dissolved oxygen are presented
in Figures 11, 12, and 13.  Profiles are interpolated between sampling
depths.  Spring values were relatively high.   Less dissolved oxygen
was found in the deeper waters of the lower basin, implying the
presence of "older" water at those stations.   The oxygen minimum
observed at Stations 01 and 19 at about 50 meters depth appears to
correspond to an old plateau canyon break prior to inundation.   The
minimum is more pronounced in the wider lake areas (Station 19), where
there is a corresponding increase in the extent of the exposed ledge.
Page and Johnson (1975) attribute the dissolved oxygen minimum to
biological respiration of organic rain.  During the summer sampling
(Figure 12) the dissolved oxygen minimum observed in the upper 30 meters
generally corresponds to the thermocline.  In this instance biological
respiration is, in all probability, the responsible agent.  December
sampling (Figure 12) found virtually no structure in the dissolved
oxygen distribution other than a poorly developed deep oxycline at
several stations at the 35-50 meter level.

-------
                                 18
DAM2   1   19
                                 STATION NUMBERS
                         15   14   12          11    10
                                                                         0


                                                                         10


                                                                         20
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                                                                         40


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                                                                         60


                                                                         70
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80


120


160


200


240

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          mg/l
 0.0. PROFILE SCALE .
    CENTER
7 WITH STATION MARK
     Figure 12.  Dissolved  Oxygen Profiles and  Cross Section
                 (Isopleths in mg/liter), Lake  Powell  Main Channel,
                 August  1975.
                 o —  pumped water sample.
                              STATION NUMBERS
0

40


80
120

160

200


240
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-


•
-
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                                                                         70
     Figure 13.  Dissolved  Oxygen Profiles and Cross  Section
                 (Isopleths  in  mg/liter, Lake Powell  Main Channel,
                 November-December 1975

                 Profiles with  o  indicating the depth of pumped
                 water samples  were obtained in December, those
                 with r,  in  November.

-------
                                  19
2.   Tributary Arms
     San Juan Arm
          In April relatively warm, low salinity water from the San
     Juan River overflowed the colder, more saline waters of San Juan
     Arm.  Warm surface waters (> 13° C) were found to about the 6 meter
     level at Station 16, the most upstream sampling station (Figure
     2).  By Station 13, about halfway down the Arm, the 13° C  isotherm
     had risen to about 1.3 meters and the 12° C isotherm from  7 to  3.5
     meters.  Station 14, located at the mouth of the Arm, had  no
     temperatures greater than 11° C.  Temperatures averaged about
     1° C higher at all depths in the San Juan Arm than at Station 14
     the Colorado River Channel.   These stations were sampled in sequence
     by the same flight team so sampling and/or temporal  differences
     do not account for this discrepancy.
          In August, the temperatures of the inflowing waters were quite
     high (23-25  C).  Interestingly, the surface water at Station 13
     midway along the Arm was warmer and less conductive than at either
     end.
          Stations 13, 14, and 16 were sampled in November during the
     final round.  Very low temperature, low conductivity waters from
     the San Juan River were found at Station 16.  Stations 13  and 14
     had warmer, more conductive water at all levels.

-------
                                  20
EscaJjnte Canyon
     Escalante Canyon is represented by Station 17 upstream and
Station 12 near the canyon mouth in Lake Powell's main channel
(Figure 2).  In April, surface temperatures and conductivities were higher
in the canyon than in Lake Powell proper, while at depth there was a
slight reversal of this trend.  During the summer, higher surface
temperatures were found in the canyon while water temperatures at inter-
mediate levels were similar to those in the open lake.  Summer conduc-
tivity values obtained at Station 17 are suspect due to intermittent
malfunction of the probe.  Low dissolved oxygen levels were found at
the bottom and at about 21 meters, the level of a submerged ledge.
During the winter sampling, however, little difference was noted between
the two stations.  Within the canyon, an oxygen minimum occurred at
about 42 meters depth.
Bullfrog Basin
     Bullfrog Basin is represented by Station 18, located at the upper
end of the Basin, Station 06, near Bullfrog Marina, and Station 11,
situated in the main channel where Lake Powell  necks down from the
relatively wide lake area near Bullfrog (Figure 3).  Because of their
exposure, Stations 06 and 18 were reoccupied at slightly different locations
on each sampling round to take advantage of windbreaks provided by
the surrounding bluffs.   In November, for instance, Station 06 was
located nearly inside the Bullfrog anchorage area while in December it
was near midchannel  and in April  somewhat favored the opposite (western)

-------
                                  21
side of the Basin.  In April Station 06 was sampled 2 weeks earlier than
Stations 11 and 18.  During the fall sampling Station 11  was only
visited in December while 06 and 18 were sampled both in  November and
December.
     During the spring sampling, temperatures for the upper 15 to 18
meters were slightly less inside Bullfrog Basin than at Station 11.
Below that level the water was apparently the same.  There were no
significant differences in conductivity or dissolved oxygen between
the three stations.  Values for pH were somewhat lower within Bullfrog
Basin than in Lake Powell proper.   During the August sampling, data
from the three stations were very similar except for low  dissolved
oxygen values near the bottom at Station 18.   During the  November and
December rounds there was little variation between stations although
both pH and dissolved oxygen values were slightly higher  inside the
Basin.  Between the November 25th and December 3rd samplings temperatures
decreased about 2° C over the entire water column at Station 18, while
conductivity and oxygen values increased slightly.  The % saturation
values of dissolved oxygen remained the same, however.  At Station 06
both conductivity and temperature decreased markedly between the November
and December samplings.  (Temperature accounted for only about one-half
of the conductivity change.)  The observed changes at this site were
probably due in part to the adjustment of station location.

-------
                                  22
Navajo Arm
     Navajo Arm is represented by samples at Station 01, at the con-
fluence with lower Lake Powell, and Station 04, about midway up its
length (Figure 1).  A planned station at the upper end of the Arm was
deleted due to the very narrow canyon walls in that area.  Water
conditions were similar at both stations during the April and August
sampling rounds although slightly higher temperatures and conductivities
were present at Station 04 in August.  A weak dissolved oxygen minimum
was present at Station 04 at 45-48 meters on both rounds.  In
December the water above 36 meters at Station 04 was isothermal and low
oxygen values were found at all levels.  Conductivity values were
higher at all depths inside the Arm than in Lake Powell proper, the
difference increasing with depth.

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                                  23
C.    Biological Characteristics:
          Biological collection methods were described previously.
     The data obtained are presented in the following tables:
     1.   Phytoplankton -
Sampling
Date
04/16/75





08/14/75






12/01/75




Dominant
Genera
1.
2.
3.
4.


1.
2.
3.
4.
5.


1.
2.
3.
4.
5.
Chroomonas?
Fragilaria
Cryptomonas
Glenodinium
Other genera
Total
Fragilaria
Chroomonas?
Centric diatom
Navicula
Skeletonema
Other genera
Total
Chroomonas?
Fragilaria
Cryptomonas
Tetraedron
Scenedesmus
Algal
Units
Per ml
513
423
257
29
-T-
1,227
816
371
185
148
148
279
1,947
486
333
26
26
26
                                             Other genera
                                                  Total
897

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                                 24
     2.    Chlorophyll  a_-


Station                          Chlorophyll £  (ug/1)
Number         Sampling Round:   April        August        Nov/Dec

  01                              ---           2.2          —/0.8
  02                             1.0           2.1          —/0.5
  03                             1.0           2.2          —/0.9
  04                             0.5           2.6          ---/0.8
  05                             2.5           4.7          ---/1.5
  06                             1.5           7.3          1.9/0.8
  07                             —           1.8          —/0.7
  08                             1.5           —          — /-- -
  09                             2.0         23.6          ---/1.4
  10                             1.2           5.8          —/l-l
  11                              1.7           6.7          ---/0.9
  12                             1.2           4.7          —/I.I
  13                             1.3           4.5          1.7/—
  14                             0.9           5.3          1.9/ —
  15                             1.2           4.3          2.2/0.9
  16                             1.5           8.7          9.2/ —
  17                             1.5           3.9          ---/0.9
  18                             1.5           6.3          2.1/1.3
  19                             1.3           2.7          ---/1.5

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                                  25
     D.    Limiting Nutrient Study

          1.    Algal  assay results on composited Lake Powell  water

          that has been autoclaved, filtered, and nutrient spiked.*
Spike (mg/1)

Control
0.050 P
0.050 P + 1.0 N
1.0 N
Spike (mg/1)

Control
0.050 P
0.050 P + 1.0
1.0 N
Control
0.050 P
0.050 P + 1.0 N
1.0 N
                    Stations 06 and 08 -
                    Date Sampled 4/16/75
Ortho P
Cone, (mg/lj

   0.006
   0.056
   0.056
   0.006
Inorganic N
Cone, (mg/1)

   0.440
   0.440
   1.440
   1.440
                    Station 09
                    Date Sampled 4/28/75
Ortho P
Cone  (mg/1)
Inorganic N
Cone,  (mg/1)
  <0.005              0.556
  <0.055              0.556
  <0.055              1.556
  <0.005              1.556

 Station 13 and 16
 Date Sampled 4/28/75
Ortho P
Cone, (mg/1)

   0.015
   0.065
   0.065
   0.015
Inorganic N
Cone, (mg/1)

   0.490
   0.490
   1.490
   1.490
Maximum Yield
(mg/1-dry wt.)

     0.1
     5.1
     7.3
     0.1
Maximum Yield
(mg/1-dry wt.)

     0.1
    14.7
    21.2
     0.4
Maximum Yield
(mg/1-dry wt.)

     4.0
    16.7
    22.1
     6.6
*See EPA, 1975.

-------
                                  26
Control
0.050 P
0.050 P
1.0 N
          1.0 N
Spike (mg/1)
Control
0.050 P
0.050 P +
1.0 N
          1.0 N
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Spike (mg/1)

Control
0.050 P
0.050 P + 1.0 N
1.0 N
                    Stations 12 and 17
                    Date Sampled 4/29/75
Ortho P
    ^ (mg/1)

  <0.005
  <0.055
  <0.055
  <0.005
                                      Inorganic N
                                      Cnc.
   0.375
   0.375
   1.375
   1.375
                    Stations 11  and 18
                    Date Sampled 4/29/75
Ortho P
Cone, (mg/1)

   0.005
   0.055
   0.055
   0.005
Inorganic N
Cone, (mg/1)

   0.450
   0.450
   1.450
   1.450
                    Stations 14, 15, and 19
                    Date Sampled 4/28/75
                   Ortho P
                   Cone, (mg/1)

                     <0.005
                     <0.055
                     <0.055
                     <0.005
                                      Inorganic N
                      0.475
                      0.475
                      1.475
                      1.475
                    Stations 02, 03, 04, and 07
                    Date Sampled 12/1/75
                   Ortho P
                   Cone, jmg/1)

                      0.005
                      0.055
                      0.055
                      0.005
                   Inorganic N
                   Coney jmg/l|

                      0.320
                      0.320
                      1.320
                      1.320
Maximum Yield
(mg/J-dry wt.)

     0.2
     0.4
     0.5
     0.2
Maximum Yield
(mg/1-dry wt.)

     0.3
    12.3
    19.0
     0.2
                   Maximum Yield
                   (mg/1-dry wt.)

                        0.2
                       13.2
                       13.6
                        0.2
                   Maximum Yield
                   (mg/1-drj^ wt._]

                        0.1
                        0.1
                        0.1
                        0.1

-------
                                   27
 Spike (mg/1)

 Control
 0.050 P
 0.050 P + 1.0 N
 1.0 N
 Spike (mg/1)

 Control
 0.050 P
 0.050 P + 1.0 N
 1.0 N
 Sjpi ke (
 Control
 0.050 P
 0.050 P + 1.0 N
 1.0 N
 Spike (mg/1)

Control
0.050 P
0.050 P + 1.0 N
1.0 N
                     Stations 05, 09, and 10
                     Date Sampled 12/3/75
Ortho P
Cone, (mg/1)
Inorganic N
Cone! (mg/1)
   0.005              0.455
   0.055              0.455
   0.055              1.455
   0.005              1.455

 Stations 11 and 17
 Date Sampled 12/4/75
Ortho P
Cone, (mg/1)

   0.005
   0.055
   0.055
   0.005
Inorganic N
Cone, (mg/1)

   0.390
   0.390
   1.390
   1.390
                     Stations 13 and 16
                     Date Sampled 11/24/76
Ortho P
Cone, (mg/1)

   0.005
   0.055
   0.055
   0.005
Inorganic N
Cone, (mg/1)

   0.370
   0.370
   1.370
   1.370
                     Stations 06 and 18
                     Date Sampled 12/3/75
Ortho P
Cone, (mg/1)

   0.005
   0.055
   0.055
   0.005
Inorganic N
Cone, (mg/1)

   0.355
   0.355
   1.355
   1.355
Maximum Yield
(mg/1-dry wt,J_

     0.2
    13.7
    18.6
     0.2
Maximum Yield
(mg/1-dry wt.)

     0.2
     0.6
     0.6
     0.3
Maximum Yield
(mg/1-dry wt.)

     0.5
    13.6
    21.0
     0.4
Maximum Yield
(mg/1-dry wt.)

     0.3
    11.4
    15.6
     0.3

-------
                                  28
               1.    Stations  01,  12,  15  and  19
                    Date Sampled  12/2/75

                   Ortho P            Inorganic  N        Maximum Yield
Spike (mg/1)       Cone, (mg/1)        Cone,  (mg/1)        (mg/l-dry  wt.)

Control                0.005              0.395                 0.3
0.050 P               0.055              0.395                 4.4
0.050 P + 1.0 N       0.055              1.395                 1.1
1.0 N                 0.005              1.395                 0.2
     2.    Discussion -

               The control  yields of the assay alga,  Selenastrum

          capricomutum*, indicate that potential  primary productivity

          of Lake Powell  was generally low at the  time the samples

          were taken.   The  April  composite samples from Stations 13

          and 16 in the San Juan  Arm contained elevated phosphorus

          levels due to San Juan  River discharge at Station 16.   The

          assay control yield from this sample was an order of magnitude

          greater than that from  other stations.   The increases  in

          yield with orthophosphorus alone indicates  that Lake Powell

          is limited by phosphorus.   The addition  of  nitrogen alone

          resulted in  yields which were not significantly different

          than those of the controls.

               The reservoir data substantiate phosphorus limitation;

          i.e., the mean  inorganic nitrogen to dissolved orthophosphorus

          ratios were  25/1  or greater at all  stations on all sampling
      "for further information  regarding  the  algal assay  test  procedure
       and selection  of test  organisms, see U.S.  EPA  (1971).

-------
                             29
rounds except for Stations 09 and 16 during  the August  sampling.
Both of these stations are near the inlets of major river systems
and were sampled near the time of maximum flow.   Even these
stations had ratios of 15/1  to 11/1 respectively.   This range
is one of transition from phosphorus to nitrogen limitation
(N/P ratios of greater than 16/1  are indicative of phosphorus
limitation.)
     Several of the algal assays exhibited  little or no response
to addition of nutrients.  Available data are insufficient to
determine the cause of these anomalous results.   However, possible
explanations include the presence of a toxin or limitation by a
nutrient other than nitrogen or phosphorus.

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                                  30
IV    NUTRIENT  LOADING

          Stream sampling  was  not  conducted for Lake Powell tributaries

     as part of the  National Eutrophication Survey.  However,  by using

     USGS data available  in  STORET,  EPA's  water quality computer data

     bank, some estimates  of loading can be obtained.

          Loading estimates  were made from STORET and other data using

     several different computational  schemes  for 1974, 1975, and long-

     term records.   Data was adequate for  computation on only  three

     tributaries, the  Colorado, Green, and San Juan Rivers.  These

     three rivers,  however,  account  for 98% of the entering flow.  The

     three available monitoring sites are  all at least 100 kilometers

     upstream  from the lake.   Because of this, and the nature  of the

     available data, ranges  of the computed loadings are provided in

     the following  table:

     A.   Annual  Nutrient  Loading  Ranges:

          1.   Inputs                   Kg P/Yr.            Kg N/Yr.

          Colorado  River at
           Cisco, Utah                 10-14  x 105        229-329 x 105

          Green River  at
           Green  River, Utah           23-30  x 10$         80-240 x 105

          San  Juan  River at
           Mexican  Hat, Utah           5-14  x 1p5        110-130 x 10b

                   Total                38-58  x 10^        419-699 x 105

-------
                                  31
     2.    Outputs                       Kg P/Yr.             Kg  N/Yr.
     Lake Outlet, Colorado
      River at Lees Ferry,
      Arizona                           1-2 x 105          238-292  x
     3.    Net Annual
                                       36-57 x 105  kg      127-461  x  10$  kg
B.         As can be seen,  the lake is an effective nutrient  trap.
     Most of the nutrients appear to be deposited  very near  to the
     inlets of the tributaries.   Ambient total  phosphorus  and  total
     nitrogen (N02 + N03 + Total  Kjeldahl)  concentrations  (Appendix  B)
     are markedly less at  Station 16 than those observed  in  the San
     Juan River at Mexican Hat,  and those at Station  09 are  similarly
     less, except during the April sampling near the  time  of peak
     runoff.  At Stations  13 and 05 the reductions in nutrient concen-
     trations are even more dramatic.
C.    Yearly Loads:
          The calculated annual  phosphorus  loading from the  rivers
     ranges from 5.8 to 8.9 g/m2/yr with over 97%  of  the  phosphorus
     being retained by the lake.   If these values  are compared to  those
     proposed by Vollenweider (Vollenweider and Dillon, 1974)  they
     are an order of magnitude greater than his "eutrophic"  loading
     level of 0.96 g/m2/yr.  Vollenweider postulates  that  at greater
     than his "eutrophic"  loading level, receiving waters  will become
     eutrophic.  However,  the rapid disappearance  of  the  high  incoming
     phosphorus concentrations suggests that most  of  the  phosphorus

-------
                             32
is being deposited near the stream mouths.   It is probable
that the effective loading, after consideration of this large
sedimentation rate, would still  be above the "eutrophic" level,
but only slightly so.   A progression towards more eutrophic
conditions can be expected; however, the change should be
relatively slow under present conditions.

-------
                                  33
V.    LITERATURE REVIEWED

     Bureau of Reclamation.   1966.   Reclamation Project Data
       (Supplement).   U.S.  Department of Agriculture,  GPO,  Washington,
       D.C.

     Page, F.  W., and N. M.  Johnson.   1975.   Seasonal  distribution of
       dissolved oxygen in  Lake Powell, Utah-Arizona.   Abstracts of
       Papers  Submitted for the Thirty-eighth Annual  Meeting,
       American Society of  Limnology and Oceanography, June 1975.

     Reynolds, R. C., Jr.,  and N.  M.  Johnson.  1974.   Major element
       geochemistry of Lake Powell.   Lake Powell  Research Project
       Bulletin #5.

     Standiford, D. R., L.  D.  Potter, and D.  E. Kidd.   1973.  Mercury
       in the  Lake Powell ecosystem.   Lake Powell  Research  Project
       Bulletin #1.

     U.S. Environmental Protection Agency.  1971.   Algal  assay
       procedure bottle test.   National Eutrophication Research
       Program, Corvallis,  Oregon.

     U.S. Environmental Protection Agency.  1975.   National Eutrophi-
       cation  Survey Methods 1973-1976.  Working  Paper No.  175.
       National Environmental  Research Center, Las Vegas, Nevada,  and
       Pacific Northwest Environmental Research Laboratory, Corvallis,
       Oregon.

     U.S. Geological  Survey.  1973.   Surface  water supply of the
       United  States 1966-1970.  Part 9, Colorado  River Basin, Volume 2.
       Water Supply Paper 2125.  U.S. Department  of Interior, GPO,
       Washington, D.C.

     Vollenweider, R. A., and  P. J.  Dillon.   1974. The application of
       the phosphorus loading  concept to eutrophication research:
       National Research Council of Canada,  Publication No. 13690,
       Canada  Center for Inland Waters, Burlington, Ontario.

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                                 34


VI.  APPENDICES
                            APPENDIX A

                   PARAMETRIC RANKINGS OF LAKES
                      SAMPLED BY NES  IN 1975

                          STATE OF ARIZONA
     Mean or median values for six of the key parameters evaluated
 in  establishing the trophic conditions of Arizona lakes sampled
 are presented to allow direct comparison of the ranking, by parameter,
 of  each  lake relative to the others.  Median total phosphorus, median
 inorganic nitrogen and median dissolved orthophosphorus levels are
 expressed in mg/1. Chlorophyll ^ values are expressed in yg/1.
 To  maintain consistent rank order with the preceding parameters,
 the mean Secchi disc depth, in inches, is subtracted from 500.
 Similarly, minimum dissolved oxygen values are subtracted from 15
 to  create table entries.

-------
                 ARIZONA LAKES
LAKt  OATA  TO 8E  US^D  IN  "ANKtNGS
LAKE
CODE LAKF '.AMP
0401 -fVELT La*E
0411 SAN C&RLO^ wPstK^OIK
N'EOIAN
TOTAL P
1 1 M A j 2
0 • 0 ^ *^
O.nis
0.162
0.099
n.oi7
0.027
U.010
n.04b
0.020
0.056
MEDIAN
INORC- N
0.090
0.090
0.170
0.050
0.060
0.240
0.040
0.410
0.045
0.040
0.060
SOO-
MEAN SEC
JSh.OOO
466.600
420.231
396.250
4H4.667
369.667
449.154
322.140
440.750
429.917
474.500
MEAN
CrILOHA
2.900
10.683
3.948
3.400
2.633
4.404
9.808
2. BOO
16.367
4.073
14.750
1S-
HIN oo
9.000
14. BOO
10.800
12.200
9.000
8.600
14.900
13.800
12.000
14.000
14.600
MEDIAN
OISS ORTHO P
0.007
0.014
0.005
0.131
0.056
0.010
0.004
0.009
0.009
0.008
0.009

-------
OF LAKES *ITH Hl'inEP  VALUES  )
*0 , 2)
90 ( •?)
0 ( 0)
10 ( 1)
80 ( *>
60 ( e>)
100 ( lu)
40 ( *)
70 ( n
30 ( 3)
MEDIAN
INOPG
35 (
35 (
20 (
70 (
60 (
10 (
95 (
0 <
80 (
95 (
50 (
N
3)
3)
*)
7)
6)
1)
9)
0)
6)
9)
5)
500-
MEAN SEC
80 (
20 (
hO (
70 1
0 (
90 (
30 1
100 1
40 1
50 (
10 i
; 8)
2)
: 6)
; 7»
; o>
: 9)
[ 3)
[ 10)
[ 4)
I 5)
I 1)
MEAN
CMLORA
60 1
20 1
60 1
70 1
100 1
40 1
30 1
90 I
0 i
50 i
10
I 8)
! 2)
[ 6)
[ 7)
; 10)
[ 4)
[ 3)
[ 9)
I 0)
( 5)
( 1)
15-
MIN 00
85 1
10 (
70 1
50 <
65 1
100 1
0 1
40 1
60 1
30 I
20 i
: 8>
: i)
; 7)
( 5)
: e)
: 10)
I 0)
I 4)
t 6)
1 3)
( 2)
MEDIAN
OISS ORTHO P
80 I
20 (
90 1
0 1
10 (
30 1
100 1
55 I
40 1
70 (
55 ^
[ 8)
[ 2)
I 0)
[ 0)
; i)
I 3)
I 10)
I 5)
I 4)
( 7)
I 5)

-------
                            UTAH  LAKES
LAKE  OATA TO  *E US^Q  IN  RANKINGS
LAKE
CODE
0401
4901
490?
4903
4904
4905
4906
4907
490"
4909
4910
4911
4913
4913
4914
4915
491*
4917
491«
4919
4920
4931
493?
4933
4934
49«
560^
LAKE NAME
LAKF POWELL
^EA^ LAKE
LOWE^ BOWN'S HESERVOIR
DEEP CREEK RESERVOIR
ECHO RESERVOIR
LYNN RESERVOIR
FISH LAKE
HUNTINGTON NORTH RESEPVO
JOE'S VALLEY fJE^ERVOTR
MINFRSVILLE °FSERVOIR
MOON LAKE
NAVAJO LAKE
NEWCASTLE RESERVOIR
OTTER CREEK RESERVOIR
PANQUITCH LAKE
°ELTCAN LAKE
PINFVIEW PESFPVOIP
PItJTE RESERVOIR
PORCUPINE RESERVOIR
PRUESS RESERVOIR (GARPIS
SEVIER HPIDGF RESERVOIR
STARVATION RESERVOIR
STEINAKER RESFRVOIR
TRONIC RESERVOIR
UTAH LAKC
WILLARD HAY •^E'-F.RVOIR
FLAMING GOR&F RESERVOIR
MEDIAN
TOTAL P
0
0
0
0
n
0
0
0
0
0
0
0
0
0
0
0
0
n
0
0
0
0
0
0
0
0
0
.010
.011
.031
.038
.047
.131
.033
.013
.013
.1^3
.OOfl
.A16
.051
.067
.071
.044
.028
.047
.035
.057
.036
.016
.011
.031
.13?
.044
.011
MEDIAN
INORG N
0.410
0.040
0.040
0.315
0.170
0.200
0.040
0.040
0.045
0.060
0.040
0.040
0.040
0.040
0.040
0.050
0.300
0.150
0.110
0.140
0.355
0.04Q
0.040
0.050
0.^20
0.060
0.690
500-
MEAN SEC
339
353
336
430
450
417
153
393
400
445
381
36R
4?8
453
436
438
435
483
440
491
449
394
316
4?5
4PO
457
2"b
.830
.167
.000
.333
.333
.667
.000
.000
.000
.000
.000
.000
.667
.667
.500
.500
.083
.625
.000
.000
.778
.583
.750
.000
.583
.182
.636
MEAN
CHLORA
3
0
5
9
6
39
13
1
?
33
3
2
12
11
45
6
5
25
7
4
18
5
1
7
72
7
2
.081
.945
.567
.078
.967
.600
.483
.900
.4H3
.583
.700
.000
.467
.767
.950
.350
.692
.329
.860
.533
.223
.675
.844
.300
.013
.567
.500
15-
MIN DO
13.
9.
9.
14.
14.
10.
10.
7.
11.
8.
9.
6.
13.
10.
14.
8.
14.
11.
12.
8.
12.
13.
12.
a.
11.
11.
10.
800
200
400
800
000
400
400
800
200
600
600
000
600
600
200
400
600
600
400
800
4QO
300
600
400
400
000
400
MEDIA*
DISS ORTHO o
0.007
0.003
0.006
0.006
0.01?
0.053
0.004
0.005
0.003
0.107
0.002
0.003
0.000
0.033
0.010
0.004
0.006
0.007
0.011
O.OOP
0.008
0.004
0.005
0.006
0.012
0.009
0.003

-------
LAKf
CODE  LAKE NAME

040"  LA*E POwFLL

4Q01  3EA& LAKE

490?  LOWFR PO«*\-«S

4903  DEEP C»EE<

4904  ECHO

4905  L*NNJ

4006  FISH

4907  HIINTINGTON NORTH PESEPVO

490B  JOE'S VALLEY

490Q  MTNERSVILl.E

4Qlo  MOON LAKE

4911  NAVAJO LAKt

4912  NEWCASTLE PESE«VOIR

4913  OTTER CREE< RESERVOIR

4914  PANOUITCH

4915  PELICAN L

4916  PINEVIEW

4017

491 8  PORCUPINE

4919  PRUESS

4920  SEVIE» BRIDGE

4921  STADVATIOM

40??  STEINA

49?3  TROPIC

A9?4  UTAH

49?S

      EI.AWIMG GORGE
(GARRIS
TOTAL
96 (
OO (
46 (
42 (
31 (
a (
62 (
77 (
81 (
0 (
100 (
69 (
23 (
15 (
12 (
•^7 (
bO (
?7 (
Sp (
10 (
54 (
73 (
85 (
65 (
4 (
37 (
<)0 (
P
25)
23)
1?)
11)
8)
2)
16)
20)
?1>
0)
26)
18)
6)
4)
3)
9)
13)
7)
15)
5)
14)
19)
22)
17)
1)
9)
23)
INOPG
4 (
87 (
87 (
19 (
27 (
23 (
65 (
65 (
58 (
44 (
67 (
37 (
87 (
87 (
65 (
54 (
15 (
31 (
38 (
35 (
8 {
87 (
87 (
50 (
12 (
44 {
0 (
                                        500-
                           INOPG N    MEAN SEC
87 ( 19)    96  (  25)

87 ( 19)    «5  (  22)

19 (5)    42  (  11)

27 (7)    19  (   5)

23 (6)    58  (  15)

65 ( 16)    100  (  26)

65 ( 16)    69  (  18)

58 ( 15)    6?  (  16)

44 ( 11)    27  (   7)

67 ( 19)    73  (  19)

37 ( 19)    77  (  20)

87 ( 19)    46  (  12)

87 ( 19)    15  (   4)

65 ( 16)    50  (  13)

54 ( 14)    35  (   9)

15 (4)    38  (  10)

31 (  8)     8(2)

38 ( 10)    31  (   8)

35 (  9)     0(0)

 8(2)    23  (   6)

87 ( 19)    65  (  17)

87 ( 19)    88  (  23)

50 ( 13)    54  (  14)

12 (  3)     4(1)

44 { 11)    12  (   3)

 0(0)    92  (  24)
SEC
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
21)
25)
22)
11)
5)
15)
26)
18)
16)
7)
19)
20)
12)
4)
13)
9)
10)
2)
8)
0)
6)
17)
23)
14)
1)
3)
24)
MEAN
CHLOHA
73
100
65
35
50
8
23
92
85
12
77
88
27
31
4
54
58
15
38
69
19
62
96
46
0
42
81
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
19)
26)
17)
9)
13)
2)
6)
24)
22)
3)
20)
23)
7)
8)
1)
14)
15)
4)
10)
18)
5)
16)
25)
12)
0)
11)
21)
15-
MIN 00
15
77
73
0
12
6?
62
96
46
85
69
100
19
54
9
90
4
38
33
81
33
23
27
90
42
50
62
( 4)
( 20)
( 19)
( 0)
( 3)
( 15)
( 1*)
( 25)
( 12)
( 22)
( 18)
( 26)
( 5)
( 14)
( 2)
( 23)
( 1)
( 10)
( 8)
( 21)
( 8)
( 6)
( 7)
( 23)
( 11)
( 13)
( 15)
M
DISS
42
90
50
58
13
4
79
69
96
0
100
85
27
8
23
73
58
46
19
37
37
79
65
58
13
31
90
ESpT->
( 11 >
( 2-»
( 1**
( 14*
( •*»
( T /
( 2" J
( 1»
( 2=:
( 0,
( 2*1
( 2»
( 7)
( ?•
( M
( 1°)
( 14)
( 12)
( =;>
( 9)
( 9)
( 20)
( 17)
( 14)
( 3)
( 8)
( 23)

-------
    APPENDIX B



CONVERSION FACTORS

-------
                CONVERSION FACTORS

Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
Cubic meters x 8.107 x 10"  = acre/feet
Square kilometers x 0.3861 = square miles
Cubic meters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
       *
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711  - Ibs/square mile

-------
        APPENDIX C



PHYSICAL AND CHEMICAL DATA

-------
STO^tT KE.TrtIt.VAL  uATt
UAIL LUTrtOPnlCATION
trA-LAS VEGAS
 CU08U1
36 5o 4b.O 111 33  05.0  3
                                                                   04005
                                                                           AHllUNA
DATE
(• HO"
TO
75/04/15










75/OH/14








75/12/02







TIME UtHTrt *aTE.K
OF rtMi-
DAY FEET
14
14
14
14
14
14
14
14
14
14
1*
13
13
13
13
13
13
13
13
13
11
11
11
11
11
11
11
11
30
30
30
30
30
30
30
30
30
30
30
15
15
15
15
15
15
15
15
15
05
05
05
05
05
03
05
05
0000
0005
0015
0025
0050
00b5
0073
0120
0130
016d
0200
0000
0003
001^
0030
0050
00/5
0115
0133
0200
0000
0005
0030
0060
014C
017U
0200
0220
CENT
lu
10
9
9
*
4
b
7
7
b
b
24
25
25
21
17
15
11
b
5
13
I'c
12
11
11
9
b
7

. ?
.1
.3
.8
.6
.5
.5
.9
.4
.9
.7
.1
.3
.1
.5
.1
.4
.0
.5
.9
.2
.3
.1
.9
.4
.b
.3
.0
00
Ml>/L
10
y
9
9
9
V
a
7
6
6
b
9
7
8
a
5
5
6
b
7
7
7
o
7
7
b
6
6


.0
.0
.6
.7
.2
.4
.6
.4
.0
.0
.2
.0
.6
.2
.4
.4
.6
.b
.6
.2
.2
.u
.4
.0
.2
.0
.2
.4
                       00010     00300     00077      00094     00400
                                          TMA,«,iP    CNOUCTVV     HH
                                          StCCHl    HELO
                                          INCHES    MicwOMHO     su

                                               19e        5b9      b.40
                                                         5bl      8.30
                                                         b7b      b.JO
                                                         577      b.30
                                                         57b      b.30
                                                         571      b.2o
                                                         5b5      H.10
                                                         599      7.BO
                                                         635      7.70
                                                         645      7.70
                                                         b57      7.90
                                               204        890      b.HO
                                                         940      8,bO
                                                         940      b.70
                                                         611      b.75
                                                         6b3      6.20
                                                         67b      b.10
                                                         677      b.10
                                                         63b      b.lo
                                                         5b3      8.00
                                               600        533      6.00
                                                         526      8.00
                                                         520      8.00
                                                         500      b.OO
                                                         510      b.OO
                                                         507      7.80
                                                         507      7.60
                                                         511      7.80
ES 2111202
FEET DEr-
00410
T ALK
CAC03
Mb/L
131
130
126
129
132
131
132
1*5
14b
14*
134
130
131
134
134
133
137
1*2
147
125
125
123
126
125
125
133
135
136
Tn CLAbS
00610
NH3-N
TOTAL
MG/L
0.020
0.020K
0.020K
0.020K
0.020
0.020K
0.020
0.020*
0.020K
0.020K
0.0?0
0.040
0.040
0.030
0.030
0.030
0.020
0.020
0.030
0.040
0.020K.
0.020K
0.020K
0.020K
0.020
0.020K
0.020K
0.020K
00
00625
TOf KJtL
N
MG/L
0.400
0.300
0.300
0.300
0.300
0.200
0.200
0.200
0.200
0.300
0.200K
0.200
U.200K
0.200K
0.200
0.200
0.200
0.20 OK
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200*

00630
NU2SN03
N-TOTAL
MG/L
0.370
0. JbO
0.380
0.3»0
0.380
0.3*0
0.410
0.^20
0.640
0.660
0.6&0
0.170
0.170
0.180
0.180
0.410
0.430
0.400
0.430
0.500
0.2HO
0.270
0.270
0,?-50
0.^0
0.510
0.520
0.^60

00671
PhOS-OlS
OHOO
MG/L H
0.014J
0.011J
0.013*
0.012K
0.012K
0.013K
0.012K
0.012K
0.011*
Q.OlbK
0.019K
0.013
0.009
0.010
0.011
0.009
0.011
o.oii
0.012
0.010
0.002
O.Q02K
0.002K
0.002K
0.002*
0.002K
0.002K
0.002K
          K VALUE KNOWN TO BE LESS
              THAN INDICATED
          J VALUE KNOWN TO BE  IN ERROR

-------
        HtTriltVAL DATE  76/11/26
NATL EUr^OPi-ICAT ION SUHv/tY
tPA-LAS
 040801
J6 58  4b.O 111 23  05.0 3
                                                                      04005
                                                                      11EPALES
                                                                       0999 FEtF
                     CLASS 00



UATt TIME OEPT*
(•HUM OI-
IO uAy
fb/04/15 14
14
14
14
14
14
14
14
14
14
14
75/08/14 13
13
13
13
13
13
13
13
13
75/12/02 11
11
11
11
11
11
11
11


FEET
JO
30
JO
30
30
JO
30
30
JO
30
30
15
15
15
15
15
15
15
15
15
Ob
05
Ob
05
05
05
05
05
0000
000"3
0015
OOib
0050
0065
00/5
0120
QUO
OloO
020n
0000
0005
001S
OOJO
0050
0075
0115
0155
0200
0000
0005
OOJO
OOSO
0140
01 ft)
020u
0220
00665 32217 00031
HMOi-rOT CMLHH'ttrL INLOT LT
A KFMNliNiG
MG/L C Uli/L PEKCElMT
0.017
0.011
0.012
0.010
0.011
0.011
0.009
0.007
O.OOb
0.013
0.014
0.011 2.2
0.010
0.012
U . 0 1 0
0.011
0.009
0.009
0.009
0.009
0.006 U.«
0.000
0.006
0.006
0.006
O.U05
0.005
0.006

-------
STUKtT HtTRiEVAL i.»AT£ 7b/ll/*b
NATL EUTHOPrtlCATION boHVtY
ePA-LAS VEOAS
                          040H02
                         36 56 50.0  111  29  15.0 3
                         L.AK.E
                         0<»005
                                                                                               1105*1
DftTt
ro
75/04/15







75/08/14







75/12/01





nooio
Tint DEPTH rtftTEw
OF TErtP
L»Ar FEET
13
13
13
13
13
13
13
13
10
10
10
10
10
10
10
10
15
15
15
15
15
15
30
30
30
30
30
30
30
30
00
00
00
00
00
00
00
00
30
30
30
30
30
30
0000
0005
0015
00*5
0050
0100
0150
0200
0000
0005
0025
0050
0090
0140
018U
0220
0000
0005
0015
0060
0110
0135
CtiMT
9.3
9.<»
9.3
9.2
8.5
8.1
7.0
6.5
23.4
23.6
23.2
16. a
13.8
8.8
6.7
4.7
11.7
11.7
11.6
11.7
11.7
11.7
                                  0030U
                                   uO
                                     9.7
                                     9.6
                                    10. 0
                                     9.8
                                     9.6
                                     9.2
                                     6.U
                                     3.8
                                     8.0

                                     8.2
                                     6.*

                                     7.2
                                     7 .c.
                                     6.O
                                     7.0
                                     6.9
                                     7.0
                                     7.0
                                     6.8
                                     6.6
 000^7     000*4
TfcANaP   CNOOCTVT
StCCnl   FIELD
INCHtS   MICHUMHO
                                               *0<»
    180
    300
576
577
576
571
564
364
637
645
879
937
933
790
747
641
64*
656
528
528
507
               503
               503
lltPALES
09*9
00400
PH

su
8.30
7.80
8.20
8.20
8.20
7.80
7.80
7.80
8.60
8.60
8.60
8.30
8.20
8.05
8.00
7.90
8.10
8.00
8.00
8.00
7.90
7.90
2111
FEET UEi-TH CLASS
00410
T ALK
CAC03
MG/L
128
130
131
129
130
144
146
149
121
122
122
131
130
132
13u
136
122
121
121
119
120
120
U0610
NH3-N
TOTAL
MG/L
0.030
0.020*
0.020K
0.020K
0.020
0.020K
0.020*
0.020K
0.020
0.020
0.030
0.030
0.060
0.040
0.030
0.040
0.020
0.020
0.020
0.020
0.020
0.020
L2U2
00
00625
TOT KJtL
N
MG/L
0.200
0.300
0.300
0.300
0.200
0.200
0.300
O.»00
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.2001V
0.200*
0.200*
0.2GOK
0.*OOK
0.200K
0.2UO*


00630
N02&N03
N-TOTAL
MG/L
0.390
0.370
0.370
0.370
0.380
0.630
0,h40
0.660
0.180
0.170
0.170
0.310
0.390
0.420
0.460
0.540
0.270
O.?70
0.270
0.260
0.260
0.260
  00671
'HOS-OI!
 OHTnO
 MG/L H

   O.OU
   O.Olo
   O.OK
   O.OU
   O.OU
   0.01;
   O.OH
   O.OK
   0.00"
   0.00'
   O.Olt
   O.Oli
   0.00.
   0.00.
   O.OOi
   0.00.
   0.00.
   0.00.
   0.00<
   0.00>
   0.00.
   0.00<
         K VALUE KNOWN TO BE LESS
             THAN INDICATED
        J VALUE  KNOWN TO BE IN ERROR

-------
STOHtT Rtr^IdVAt, UATL 76/11/26
NATL EUTHOPiiICATlON SlMvtY
tPA-LAS
 0*0802
36 56 50.0  ill <;9  15.0  3
LAKt PJwtLL
04G05    AKlZ'jNA
                                                                     llfcKALES
                                                                            FEET
                     CLASS 00
00665 32217 u003l
DfaTE
fHO«
TO
75/04/15







75/08/14







75/12/01





TIrtd DEPTH
Oh
DAY
13
13
13
13
13
13
13
13
10
10
lu
10
10
10
10
10
15
15
15
Is
15
15


FEET
30
30
30
30
30
30
30
30
00
00
00
00
00
00
00
00
30
30
30
30
30
30
0000
0005
0015
0025
OOaO
0100
0150
0200
0000
ooo->
0025
0050
00*0
01*0
oieio
0^£0
0000
0005
0015
0060
0110
0135
PriOS-TOT CHLrJPnYL INCOT LT


MG/L
0
0
0
0
0
U
U
0
0
0
0
0
0
u
0
0
0
0
0
u
u
u
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
A PENNING
P UG/L fEKCEitT
01 r i.o
Oil
Oil
Oil
OOH
010
010
oil
007 2.1
007
007
003
007
006
00&
007
009 0.5
007
006
007
007
006

-------
STO-iciT KfcTRInML
NAIL tUTKOPnICATIu'v
                       76/11/26
                                   040803
                                  37 01 35.0  111  25  15.0 3
                                                                    49025
                                                                            AHI/ONA
                       OOUlO
  UftTE
   TO
          Tliit  OEHTn
         OAY   KELT
                       CtfvT
00300
 00
75/04/15










75/08/14






75/12/02




15
15
15
15
15
15
15
15
15
15
15
10
10
10
10
10
10
10
09
09
09
09
09
30
30
30
30
30
30
30
30
30
3U
30
45
45
45
45
45
45
45
00
00
00
00
00
0000
0005
0015
0025
0045
0055
00/S
00*3
0100
0130
0140
OOOU
0005
0025
005D
0090
0130
Olol
OOOU
0005-
0030
OObO
01*5
9.
9.
9.
9.
9.
9.
8.

8.
8.
7.
24.

24.
17.
14.
10.
8.
11.
11.
11.
11.
11.
9
9
8
8
8
7
8

3
1
5
9

1
3
3
8
3
1
1
7
8
6
V
•«
9
9
4
lu
9

.
.
.
.
.
.
.

o.
7
7
8
a
8
6
5
5
5
7
/
7
/
t>
.
.
.
.
.
.
.
.
.
.
.
.
.
.
6
t>
6
b
6
0
0

4
8
0
0
2
4
b
8
O
4
2
0
2
0
«
 00077     00094
TKANSP   C.MDUCTVY
StCCHl   FIELD
INCMtS   MICkOMHU
                                               156
                                               216
                        577
                        576
                        577
                        577
                        577
                        574
                        567

                        572
                        577
                        606
                        954
                        952
                        916
                        756
                        747
                        b94
                        685
                        497

                        607
                        504
                        505
                                                                00400
SU

 8.30
 8.30
 8.30
 8.30
 8.JO
 8.30
 8.20

 8.10
 7.90
 7.90
 8.55
 8.60
 8.6u
 8.30
 8.10
 7.95
 7.90
 7.90
 7.90
 8.00
 8.00
 b.OO
tS 2111202
FEET Jtl-Th CLA5>S
00410
T «LK
CAC03
MG/L
13
-------
STO^tT *icTriIEVAL u&Tt
NATL EUTkOf-riICATIj.\ SUnwtY
t^A-LAS  VEGAS
 040«OJ
3? 01  35.0 111 <:5  15.0 3
                                                                               ARIZONA
                                                                             KtET  UEl-lh   CLASS  00
UttTE TIME OEi-r-' r
TO DAY FEtT
75/Of/lb Its
Ib
15
15
15
15
15
Ib
15
Ib
75/OS/14 10
10
10
10
10
10
10
7b/12/02 0*
09
OS
09
0*
30
JO
30
30
30
30
30
30
30
30
4b
45
45
45
45
45
*5
00
00
00
00
00
00 00
O'JOb
001s
OOiS
ou<*s
Oubf.
OU /t>
00ii.s
OluO
01*')
0 0 IJ 0
0005
0025
OObO
00*0
0130
Olol
0000
OOOb
OOJO
OGeO
0 1 *b
Odb6b 32217 OOOJl
-lOs-roT CMLKPNYL INCUT LI
Mb/L * Ufa/L PEKCtNT
0.1)0^ 1.0
0.008
0.008
0.007
0 . U 0 n
U.UOrt
0 . 0 0 tj
U.OUB
0.007
0.011
0 . 0 0 b 2.2
0.008
0.008
U.010
0.007
0.010
U.Ull
0.007 0.9
0.007
0.012
U .034
0.0 J9

-------
N.ATL e
                  -IATE  /b/li/26
         VEGAS
                                                                       040e04
                                                                      J6 bb  13.0 111 lt> bO.O  3
                                                                      040Ub
  DATE    ri*E
           or
   to     UAT   FtET
75/04/1-3
/b/08/14
/5/12/02
                        00010
                        CENT
                                  00300
                                   00
17
1 /
17
I/
17
17
17
17
17
14
14
14
14
14
14
14
14
14
09
09
09
09
09
09
09
09
on
00
00
00
00
00
00
00
0')
10
10
10
10
10
10
10
10
10
45
45
45
45
45
45
45
45
0000
OOOT
001"'
0030
OOoO
007b
Olon
OloO
01 / 1
OOGi'
0005
001S
0035
0050
00*0
012:1
Olb'J
0200
0000
OOOb
OOJO
OOoO
012"
0 1 / il
0200
02iU
11
11
10
10
9
b
b
7
7
25
24
24
20
17
14
11
8
6
12
It
12
12
12
<*
a
1
.0
.0
.9
.3
.6
.5
.2
.5
.2
.2
.8
.6
.7
.s»
.1
.0
.6
.9
.3
.2
.3
.2
.2
• o
.4
.4
-*.b
9.4
9.6
9.4
9.0
8.0
7.6
4.2
6.0
8.0
d.2
6.2
9.4
8.0
6.6
7.2
4.2
5.6
6.4
6.4
6.4
6.6
6.2
3.2
2.8
2.0
00077
                                            StCCHl    HtLO
                                            INCHtS    M]


                                                27b
                                                 180
                                                 252
                                                                      litMALES
                                                                       U176  FEET
                                                                                           CLAbb 00
•*A.
TVT

'MhU
600
600
o99
&90
bb3
573
5>7b
654
6b6
936
945
941
8b5
B02
733
6bS
6bO
bVO
b37
b31
b25
b32
b^8
b£4
b23
542
00400
HM

Su
a. 30
e.4C
8.30
B.30
6.10
b.10
7.90
7.7u
7.7o
U.bO
rt.bu
H.60
8.55
fl.2b
b.^0
d.10
7.90
7.60
b.oo
B.OO
a. 00
8.00
7.<»u
?.«0
7.60
7.bO
00410
T ALK
CAC03
MO./L
131
12^
129
12?
12?
UO
1J2
146
149
133
113
lib
122
12?
\0
0.380
0.400
0.380
n.460
0.540
0.310
0.310
0.300
0.^00
0.300
O.»70
0.4hO
O.b30
00671
"HOS-DIS
OHTMU
MG/L t»
0.014
0.011
O.OlJ
0.012
0.0l£
O.OO1*
o.oic
0.011
0.01«
o.ou
o.oio
0.00<1
O.OH
0.01<
O.OOc
o.oov
0.012
0.01<4
0.002
0.002
0.002
0.002
O.OGf
0.002
0.004
n.oo'
             K VALUE KNOWN TO BE LESS
                 THAN INDICATED

-------
STOHET rttTRIEVAL UATE 76/11/26
NATL tUTROPHlCATION SUKVtY
EPA-LAS tfEGAS
                                    040804
                                   36 55  13.0  111  18  50.0 3
                                   LAKE POWELL
                                   04005    AKIZONA
                                                                                           110591
                                                                  HEPALES
                                                                   0176 FEET
                                                UEKTrt
                                               2111202
                                             CLASS 00
                      00665
  DATE   TIME DEPTH PHOS-TOT
  FROM    OF
   TO    DAY  FEtT   hG/L P

75/04/15 17 00 0000    0.012
         17 00 OOO1?    0.010
         17 00 0015    0.011
         17 00 0030    0.008
         17 00 OObO    0.009
         17 00 0075    0.007
         17 00 0100    0.006
         17 00 0150    0.006
         17 00 0173    0.007
75/08/14 14 10 0000    0.010
         14 10 00OS    0.009
         14 10 0015    0.009
         14 10 0035    0.010
         14 10 0050    0.010
         14 10 0090    0.009
         14 10 0120    0.009
         14 10 0160    0.011
         14 10 0200    0.016
75/12/02 09 45 0000    0.010
         09 45 0005    0.009
         09 45 0030    0.007
         09 45 OOttO    0.007
         09 45 0120    0.007
         09 45 0170    0.016
         09 45 0200    0.009
         09 45 0220    0.012
  32217
CHLHPHYL
   A
  UG/L

     0.5
  00031
INCDT LT
RFMNING
PEHCENT
     2.0
     0.8

-------
STORET RETRIEVAL DATE  76/11/26
NATL EUTROPHICATION SUfcvEY
EPA-LAS VEGAS
 040805
37 44 40.0 110 27  00.0
LAKE POWELL
49037   ARIZONA
                                                                                            110291
                                                                               DEPTH
                     2111202
                    CLASS  00
00010
OATE TIME DEPTH WATER
FROM OF TEMP
TO DAY FEET
75/04/16 09
09
09
09
09
09
09
'09
09
09
75/08/15 08
08
08
08
08
08
08
75/12/03 10
10
10
10
10
10
10
10
25
25
25
25
25
2b
25
25
25
25
30
30
30
30
30
30
30
05
05
05
Ob
05
05
05
05
0000
0005
0015
0025
0050
0100
0125
0150
01 ttS
0200
0000
0005
0020
0035
0065
0100
0145
0000
0005
0025
0070
0120
01 tQ
0190
0220
CENT
9.4
9.5
9.4
9.4
9.3
9.3
9.0
9.1
9.1
8.7
24.3
24.5
24.5
23.5
17.6
13.3
8.8
11.8
11.8
11.9
11.8
11.8
11.0
9.2
7.8
00300 00077 00094
DO ThANSP CNDUCTVY
SECCMI FIELD
MG/L INCHES MICROMHO
9.4
9.4
9.6
9.2
9.6
7.8
8.4
9.8
8.0
8.0
8.0
8.0
5.4
5.2
5.8
7.0
7.6
8.2
8.0
8.2
8.4
8.0
a.a
8.8
9.2
144 613
614
614
613
615
620
666
736
310
806
7B 723
716
725
972
490
541
744
156 609
595
641
632
629
631
637
633
00400 00410
PH T ALN
CAC03
SU
8.35
8.35
8.45
8.40
8.40
8.40
6.40
8.40
8.35
8.35
8.60
8.65
8.20
8.10
S.OO
8.00
8.10
8.00
8.00
8.10
8.10
8.10
8.10
8.10
8.10
MG/L
132
130
131
132
133
140
141
158
157
158
117
113
143
143
115
137
134
129
132
131
131
129
137
142
145
00610 00625 00630 00671
NH3-N TOT KJEL N02&N03 PMOS-DIS
TOTAL N N-TOTAL ORTrtO
MG/L
0.030
0.020
0.020
0.020
0.020
0.030
0.030
0.040
0.050
0.050
0.020
0.040
0.020K
0.050
0.040
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020
0.020
0.020
MG/L
0.200K
0.200K
0.200K
0.200K
0.300
0.200K
0.200
0.200K
0.200K
0.200
0.400
0.400
0.300
0.400
0.300
0.500
0.300
0.200K
0.200K
0.200K
0.200
0.200*.
0.200
0.20 OK,
0.200K
MG/L
0.470
0.470
0.470
0.470
0.460
0.500
O.SOO
0.580
0.580
0.580
0.150
0.140
0.440
0.440
0.350
0.480
0.540
0.^30
0.420
0.6.30
0.430
0.420
0.470
0.490
0.510
MG/L P
0.014K
0.013K
0.012K
0.011K
0.013K
0.013K
0.014K
0.016J
0.018K
0.019J
0.003
0.003
0.002
0.003
0.008
0.027
0.015
0.003
0.003
0.002
0.002
0.002
0.004
0.003
0.003
            * VALUE KNOWN TO BE LESS
                THAN INDICATED

            J VALUE KNOWN TO BE IN ERROR

-------
STORET RETRIEVAL DATE 7fo/ll/26
NATL EUTROPHICATION SURVEY
tPA-LAS VESAS
                                                      0*0805
                                                     37 44 40.0 110 27 00.0 3
                                                     LAKE POUELL
                                                     49037
                                                                                          1102*1
                                                                 11EPALES             2111202
                                                                  0999 FEET  DEPTH  CLASS 00
                      00665
  UATE   TIME DEPTH PHOS-TOT
  FROM    OF
   TO    DAY  FEET   MQ/L P
75/04/16 09
         09
         09
         09
         09
         0V
         09
         09
         09
         09
75/08/15 0«
         06
         08
         08
         08
         08
         08
75/13/03 10
         10
         10
         10
         10
         10
         10
         10
25 0000
25 0005
25 0015
25 0025
25 0050
2b 0100
25 0125
25 0150
25 0185
25 0200
30 0000
30 0005
30 0020
30 0035
30 0065
30 0100
30 0145
05 0000
05 0005
05 0025
05 0070
05 0120
05 0170
05 0190
05 0220
0.012
0.010
0.010
0.009
0.010
0.012
0.011
0.017
0.017
0.020
0.012
0.012
0.011
0.010
0.015
0.050
0.025
0.010
0.010
0.012
0.010
0.010
0.015
0.014
0.024
                    32217
                  ChLRPHYL
                     A
                    UG/L

                       2.6
                   00031
                 INCDT LT
                 REMNING
                 PERCENT
4.7
1.5

-------
STORET RETRIEVAL DATE 76/11/36
NATL EUTROPHICAT10N SUKVEY
tPA-LAS VEGAS
                      00010     003UO
  DATE   TIME DEPTH  «ATER       DO
  FHOM    OF          TEMP
   TO    DAY  FEET    CENT      MG/L

75/04/16 10 35 0000     10.1       8.4
         10 35 0005     10.1       9.6
         10 35 0015     10.1       9.6
         10 35 0025      9.9       9.2
         10 35 0060      9.6       9.4
         10 35 0070      9.1       9.4
         10 35 0100      6.7       9.2
         10 35 0120      8.1       9.0
7b/08/15 16 10 0000     27.1       8.0
         16 10 0005     27.5       8.4
         16 10 0022     26.5       3.8
         16 10 0045     22.5       7.2
         16 10 0085     17.0       5.4
         16 10 0125     11.5       6.4
         16 1U 0168      9.8       7.0
75/11/25 09 00 0000     14.1
         09 00 0005     14.1       6.4
         09 00 0015     14.1       7.4
         09 00 0025     14.1       7.0
         09 00 0038     14.1       7.4
75/12/03 15 15 0000     11.4       8.0
         15 15 0005     11.5       7.2
         15 15 002b     11.5       7.6
         15 15 0060     11.6       7.8
         15 15 0110     11.5       8.0
         15 15 0145     10.2       7.»
 00077
TKANS*
SECCrtI
INCHES

    216
     84
    180
    156
  00094
CNOUCTVY
FIELO
MICROMHO

     581
     579
     560
     578
     574
     573
     569
     579
     602
     600
     591
     517
     558
     700
     730
     540
     540
     542
     544
     543
     452
     460
     460
     450
     438
     495
                         040806
                        37 30 00.0 110 44 00.0 3
                        LAIVE POWELL
                        49025   ARIZONA
                                                                                           110291
11EPALES
0126
00400
Prt

SO
8.45
8.45
8.45
8.40
8.40
8.40
8.3S
8.45
8.95
8.95
8.80
7.90
7.90
8.00
8.00





(5.00
8.00
8.00
8.00
8.00
8.00
FEET 0
00410
T ALK
CAC03
MG/L
127
127
127
130
129
127
128
127
106
107
108
113
119
140
143
121
119
118
117
118
119
118
117
117
120
122
                                                                              DEPTH
211120*
H CLASS
00610
NH3-N
TOTAL
MG/L
0.040
0.020
0.020K
0.030
0.030
0.030
0.030
0.040
0.020K
0.020K
0.030
0.020
0.030
0.020
U.020K
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00
00625
TOT KJtL
N
MG/L
0.600
0.300
0.300
0.200K
0.200K
0.300
0.300
0.200
0.300
0.200
0.300
0.200
0.200
0.200
o.<:oo
0.300
0.200K
0.200K
0.200K
0.200*.
0.200K
0.200K
0.200K
0.200
0.200K
0.200K

00630
N02&N03
N-10TAL
MG/L
0.420
0.410
0.410
0.420
0.420
0.430
0.450
0.460
0.040
0.0*0
0.070
0.360
0.430
0.510
0.590
0.310
0.300
0.300
0.300
0.300
0.360
0.360
0.360
0.360
0.350
0.380

00671
PMOS-DIS
ORThlO
MG/L P
0.016K
0.012K
0.011J
0.016K
0.013K
0.011K
0.011
0.013K
0.012
0.012
0.005
0.011
0.014
0.007
0.007
0.005
0.002K
0.002K
0.003
0.002K
0.002K
0.002
0.002K
0.005
0.002
0.002
          K VALUE KNOWN TO BE LESS
              THAN INDICATED
           J  VALUE KNOWN TO BE IN ERROR

-------
STOutT WtTRIEVAL UATE 76/11/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
 040806
37 30 00.0 110 44 00.0 3
LAKE HOWELL
49025   ARIZONA
                                                                                          110291
                                                                 11EPALES
                                                                  0186 FEET
            DEPTH
  2111202
CLASS 00

DflTE
F*OM
TO
75/04/16







75/08/15






75/11/25




75/12/U3







TIME DEPTH
Of

DAY FEET
10 35
10 35
10 35
10 35
10 35
10 35
10 35
10 35
16 10
16 10
16 10
16 10
16 10
16 10
16 10
09 00
09 00
09 00
09 00
09 00
15 15
15 15
15 15
15 15
15 15
15 15
0000
0005
0015
0025
006Q
0070
0100
0120
0000
0005
0022
0045
0035
0125
0168
0000
0005
0015
0025
0036
0000
0005
0025
0060
0110
0145
00665 32217
PHOS-TOT CHLRPHYL
A
MG/L P UG/L
0.011 1.5
0.011
0.011
0.011
0.010
0.008
o.ooe
0.008
0.011 7.3
0.010
0.009
0.009
0.012
0.013
0.013
0.013 1.9
0.009
0.008
0.008
0.009
o.oo9 o.e
0.009
0.008
0.009
0.012
0.012
00031
IMCDT LT
RFMNING
PERCENT



























-------
STOKET RETRIEVAL  DATE  76/11/26
NATL EUTROPhlCATION  SURVtY
EPA-LAS VEGAS
  KATE   TIME DEPTH
  FrtOM    OF
   TO    DAY  FEtT
                       00010
TEMP
CENT
00300
 00

MG/L
75/04/16





7b/0d/l4








75/12/02






13
13
13
13
13
13
08
08
08
08
08
08
08
08
06
08
08
08
08
08
08
08
30
30
30
30
30
30
25
25
25
25
25
25
25
25
25
15
15
15
15
15
15
15
0000
0025
0050
0075
0100
0130
0000
0005
0015
0025
0050
0100
0140
0185
0220
0000
0005
0030
0080
0110
0170
0215
10
10
8
a
8
7
23
23
23
23
17
13
9
7
5
11
11
12
12
12
12
9
.
.
.
.
.
•
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
4
0
6
2
0
3
7
9
6
8
3
0
5
5
7
5
4
6
6
6
5
7
7
9
9
9
8
8
7
7
7
7
6
6
4
5
5
7
7
7
7
7
6
2
.6
.8
.6
.2
.4
.2
.4
.a
«t>
.6
.8
.4
.2
.8
.0
.0
.2
.4
.6
.2
.4
.4
00077
TKANSP
StCCHl
INCHES
204





180








156






00094
CNOUCTVY
FIELD
MICHOMHO
589
582
564
565
570
583
937
930
936
934
802
720
679
674
708
609
609
604
604
603
625
648
                                             0*0807
                                            37 00 30.0 111 29 15.0 3
                                            L*KE POKELL,
                                            09025   ARIZONA
                                                                                            110291
HtPALES
0136
00400
PH

su
8. bO
8.45
8.40
B. 30
8.30
8.15
8.60
8.65
8.65
8.65
8.40
8.20
8.10
7.95
7.85
7.70
7.80
7.90
7. 90
7.90
7.90
7.80
FEET t)l
00410
T ALK
CAC03
MG/L
131
135
135
136
136
138
126
126
126
126
136
137
137
142
14?
119

119
121
121
124
13d
                                                                               DEPTH
211
H CLASS
00610
NH3-N
TOTAL
MG/L
0.030
0.02 OK
0.020K
0.020K
0.030
0.020
0.020
0.020K
0.020
0.020
0.060
0.030
0.020
0.020K
0.020K
0.020

0.030
0.030
0.020
0.020K
0.020K
1202
00
00625
TOT KJEL
N
MG/L
0.500
O.JOO
0.200
0.200
0.200
0.200
0.300
0.300
0.300
0.400
0.400
0.300
0.400
0.200*
0.200*
0.200K
0.200K
0.200*
0.200K
0.400
0.200
0.200K


00630
N02&.N03
N-TOTAL
MG/L
0.360
0.360
0.380
0.390
0.410
0.470
0.160
0.170
0.160
0.170
0.290
0.370
0.410
0.480
0.540
0.260

0.260
0.260
0.260
0.310
0.510


00671
PHOS-DIS
OHTHO
MG/L P
0.016K
0.010J
0.013K
0.011K
0.022K
0.014
0.009
0.002K
0.010
0.010
0.010
0.010
0.010
0.006
0.010
0.002K

0.004
0.002K
0.002K
0.002K
0.002K
            K VALUE KNOWN TO BE LESS
                 THAN INDICATED
            J VALUE KNOWN TO BE  IN ERROR

-------
STOHET RETRIEVAL DATE 76/11/26
foATL EUVROPHICATIOM SURVEY
EFA-LAS VEGAS
 0*0807
37 00 30.0 ill 29 15.0 3
LAKE PdtaELL
*902b   ARIZONA
                                                                                          110291
                                                                 11EPALES             E111202
                                                                  0136 FEET  OEHTh  CLASS OC
DATE
F«OM
TO
75/04/16





75/08/14








75/12/02






0066t> 32217 00031
TIME OEPT" PHOS-TOT CHLKPriYL INCDT LT
Oh A RF.MNING
DAY FEET
13
13
13
13
13
13
08
08
08
08
08
08
08
08
08
08
08
08
08
00
08
08
30
30
30
30
30
30
25
25
25
25
25
25
25
25
25
15
15
15
15
15
15
15
0000
002b
0050
0075
0100
0130
0000
0005
0015
0025
0050
0100
0140
0165
0220
0000
0005
,0030
0080
0110
0170
0215
MG/L H Uti/L PEKCENT
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.009
.010
.010
.008
.007
.004
.008 1.8
.007
.007
.009
.003
.008
.007
.009
.013
.007 0.7
.008
.008
.007
.006
.008
.006

-------
STOHET RETRIEVAL DATE  76/11/36
-IATL EUTKOPNICATION SURVEY
tPA-LAS VEGAS
  UATE   TIME DEPTH  WATEK
  FROM    OF
   TO    DAY  FEET    CENT

75/04/16 1* 50 0000
         1* 50 OOOb
         14 50 0015
         14 S>0 0025
         14 50 0045
         14 50 0065
         14 5U OlUO
         14 50 0140
                                                                 040800
                                                                31 00 3b.O 111 18 20.0 3
                                                                LAKE POWELL
                                                                                            1102*1
                                                                  11EPALES
                                                                   0148 FEET
                                                                                     2111202
                                                                                   CLASS 00
10
K
P
T
9.8
9.8
9.8
9.8
9.7
8.5
8.3
7.6
00300
00

MG/L
10.0
9.»
9.2
9.0
7.6
8.0
6.2
9.<*
00077
TRANSP
StCCHI
INCHES
216







00094
CNDUCTVY
FIELD
MICROMHO
578
b7e
578
577
576
568
576
637
00400
PH.

SU
8.45
8.45
8.45
8.45
8.30
8.25
8.00
8.00
00410
T ALK
CAC03
MG/L
125
124
125
126
127
129
146
135
00610
NH3-N
TOTAL
MG/L
0.030
0.020K
0.020
0.020K
0.020
0.020
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.400
0.200K
0.200K
0.200K
0.200K
0.200*
0.400
0.400
00630
N02&N03
N-TOTAL
MG/L
0.400
0.400
0.&00
0.340
0.430
0.460
O.hOO
U.390
00671
PMOS-DIS
ORTrtO
MG/L P
0.013K
0.011K
0.015K
O.OHK
0.012K
0.015K
0.012K
0.011K
FROM
 TO
                       00665
         TIME DEPTH PhOS-TOT
          OF
         DAY  FEET   MG/L P
75/04/16 14 50 0000     0.011
         14 50 0005     0.010
         14 50 0015     0.009
         14 50 0025     0.009
         14 50 0045     0.009
         14 50 00b5     0.008
         14 50 0100     0.010
         14 50 01<+0     0.010
  32217
CHLh^HYL
   A
  UG/L

     1.5
  OOOJ1
INCDT LT
REMNING
PEKCENT
     K VALUE KNOWN TO BE LESS
         THAN INDICATED

-------
STORET RETRIEVAL DATE 76/11/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
                                              040809
                                             37  53 45.0 110 12 40.0 3
                                             LAKE POWELL
                                             49037   ARIZONA
                                                                  11EPALES  760109      2111202
                                                                   0056 FEET  DEPTH   CLASS 00
  U«Tfc   TIME DEPTH
  FKO*    Of-
   TO    DAY  FEET
 00010
WATbK
 TEMP
 CENT
00300
 GO

MG/L
75/04/28




75/08/1S




75/12/03




14
14
14
14
14
07
07
07
O/
07
09
09
09
09
09
55
55
55
55
55
40
40
40
40
40
30
30
30
30
30
0000
0005
0015
0030
0052
0000
0005
0015
0040
0066
0000
0005
0015
0060
0065
12
12
12
12
12
23
23
23
23
22
10
10
10
2
2
.6
.6
.3
.1
.0
.1
.3
.2
.2
.1
.0
.0
.0
.5
.2
8.
8.
8.
7.
8.
7.
7.
6.
7.
6.
8.
8.
9.
11.
11.
6
6
8
6
a
2
0
6
0
2
2
6
0
8
4
00077
TKANSP
SECCril
INCHES
8




23




84




00094
CNDUCTVT
FIELD
MICKOMHO
564
583
576
566
567
1186
1169
1169
1194
1086
665
665
629
577
579
094
CTVT
D
OMHO
564
583
576
566
567
1186
1169
1169
1194
1086
665
665
629
577
579
00400
PH

SU
8.00
8.00
8.00
7.80
7.90
8.50
8.55
8.55
8.50
8.40
7.60
7.90
7.90
8.00
8.00
00410
T ALK
CAC03
MG/L
137
140
134
134
136
157
157
157
158
155
136
138
138
157
158
00610
NH3-N
TOTAL
MG/L
0.060
0.040
0.050
0.050
0.050
0.040
0.040
0.040
0.050
0.060
0.020K
0.020K
0.020
0.040
0.040
00625
TOT KJEL
N
MG/L
0.800
0.400
0.300
0.300
0.400
0.500
0.500
0.500
0.400
0.500
0.200K
0.200K
0.200K
0.200
0.200
00630
N02kN03
N-TOTAL
MG/L
0.730
0.670
0.670
0.670
0.680
0.280
0.270
0.260
0.260
0.300
0.450
0.450
0.460
0.640
0.650
OOc/l
PMOi ois
ORT027
r'«24
" VJO
0002
0.003
Qfl03
0004
0<)04
  DATE   TIME DEPT
  FROM    OF
   [0    DAY  FEET
75/04/28




75/08/15




Y5/12/03




14
14
14
14
14
07
07
07
07
07
09
09
09
09
09
55
55
55
55
55
40
40
40
40
40
30
30
30
30
30
0000
0005
0015
0030
0052
0000
0005
0015
0040
0066
0000
0005
0015
0060
0085
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.144
.096
.048
.140
.175
.032
.032
• 0£d
.032
.036
.013
.013
.013
.016
.033
0
s

/
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
665
-TOT

L P
.144
.096
.048
.140
.175
.032
.032
• 028
.032
.036
.013
.013
.013
.016
.033
32217
CHLKPHYL
A
UG/L
2.0




23.6




1.4




00031
INCDT LT
REMNING
PEKCENT















                                           K VALUE KNOWN TO BE LESS
                                               THAN INDICATED

                                          J VALUE KNOWN TO BE  IN  ERROR

-------
STORET RETRIEVAL OATE  76/11/36
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
                         040610
                        37 32  05.0  110  39  07.0  3
                        LAKE POrtELL
                        49037    ARIZONA
                                                                   11EPALES   76010V      2111202
                                                                   0999 FEET   DEPTH   CLASS  00

OATE
FrtOM
TO
75/04/28








75/08/15








75/12/03








TIME
OF
DAY
15
15
15
15
15
15
15
15
15
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14


30
30
30
30
30
30
30
30
30
45
45
45
45
45
45
45
45
45
05
05
05
05
05
05
05

DEPTH

FEET
0000
0005
0015
0030
0050
0100
0140
0180
0220
0000
0005
0025
0050
0065
0125
0165
0195
0225
0000
0005
0035
0060
0140
0160
0220
00010
MATER
TEMP
CENT
11.6
11.5
11.2
10.0
9.6
9.2
8.5
7.9
7.3
27.1
27.4
25.8
22.5
17.1
11.9
9.4
8.9
6.6
11.7
11.7
11.7
11.6
11.6
10.5
9.7
                                 00300
                                  00

                                 MG/L

                                    9.8
                                    9.6
                                   10.0
                                   10.0
                                    9.6
                                    9.6
                                    9.2
                                    9.2
                                    9.2
                                    8.4
                                    3.0
                                    5.8
                                    5.4
                                    5.6
                                    6.8
                                    8.2
                                    7.6
                                    7.2
                                    7.8
                                    8.0
                                    7.6
                                    7.8
                                    7.8
                                    6.6
                                    8.0
 00077
TKANSP   Cr
StCCHl   FIELU
INCHES   M]

    162
     96
    216
94
TVY

MHO
580
56*
560
565
571
579
634
666
703
626
621
714
564
485
672
661
733
776
483
47V
465
477
465
775
738
00400
PH

su
8.30
8.40
8.30
8.30
8.30
8.30
8.20
8.20
8.20
8.95
6.90
6.10
7.90
7.90
8. 10
b.10
6.10
8.00
8.10
8.00
8.00
8.00
6.00
8.00
8.00
00410
T ALK
CAC03
MG/L
135
134
141
136
138
140
151
156
164
98
101
111
104
106
132
136
152
150
116
116
116
117
116
148
150
00610
NH3-N
TOTAL
MG/L
0.030
0.020K
0.020K
0.020
0.020
0.030
0.040
0.040
0.040
0.060
0.030
0.040
0.020
0.030
0.030
0.020
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00625
TOT KJtL
N
MG/L
U.400
O.JUO
0.300
0.200
0.^00
0.200
0.300
0.200
U.200
0.200
0.200
0.200
0.200K
0.300
O.dOQ
0.200K
O.JOO
0.200
0.200K
O.efOOK
0.200K
0.200K
0.200K
0.200
0.200K
00630
N02fcN03
N-TOTAL
MG/L
0.410
0.400
0.400
0.410
0.430
0.460
0.520
0.580
0.640
0.060
0.060
0.280
0.360
0.390
0.
-------
STOrtET RETRIEVAL DATE. 76/11/36
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
 040810
37 32 05.0 110 39 07.0 3
LAKE HOWELL
49037   ARIZONA
                                                                 11EMALES  760109     2111202
                                                                  0999 FEET  OEHTH  CLASS  00

DATE
FfcOM
TO
75/04/28








75/08/15








75/12/03









00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF
DAY
15
15
15
15
15
15
15
15
15
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14


FEET
30
30
30
30
30
JO
30
30
30
45
45
45
45
45
45
45
45
45
05
05
05
05
05
05
05
0000
0005
0015
0030
0050
0100
0140
0180
0220
0000
0005
0025
0050
0085
0125
0165
0195
0225
0000
0005
0035
0080
0140
0160
0220
A REMNING
MG/L P UG/L PERCENT
0.016 1.2
0.013
0.013
0.010
0.009
0.009
0.011
0.011
0.016
0.012 5.8
0.012
0.010
0.009
0.016
0.010
0.009
0.010
0.013
0.009 1.1
0.007
0.009
0.009
0.009
0.013
0.014

-------
STORET RETRIEVAL UATE  76/11/36
NATL EUTROPnICATION SURVEY
EPA-LAS VEGAS
                                   040811
                                  37  27  12.0 110 44 55.0 3
                                  LAKE POWELL
                                  49037    ARIZONA
                                                                  11EPALES   760109      2111202
                                                                   0999 FEET  DEPTH   CLASS 00
                       00010
00300
OATE
FROM
TO
75/04/29








75/08/15








75/12/03







TIME DEPTH 1
OF
DAY FEET
10
10
10
10
10
10
10
10
10
16
16
16
16
16
16
16
16
16
09
09
09
09
09
09
09
09
10
10
10
10
10
10
10
10
10
40
40
40
40
40
40
40
40
40
00
00
00
00
00
00
00
00
0000
0005
0015
0030
OObS
0080
0120
0170
0220
0000
0005
0025
0045
0075
0115
0155
0190
0225
0000
0005
0030
0080
0120
0160
0170
0230
iATtR
TtMP
CENT
11
11
11
10
10
8
8
7
7
27
27
25
23
15
12
9
8
8
11
11
11
11
10
lu
11
9


.5
.2
.0
.8
.3
.7
.2
.8
.1
.5
.8
.3
.9
.3
.7
.8
.9
.6
.8
.8
.8
.4
.8
.7
.2
.4
DO
MG/L
9
9
9
11
9
9
9
9
8
8
8
5
4
4
7
8
6
a
7
7
7
7
7
7
6
6


.8
.8
.8
.0
.8
.4
.4
.4
.8
.6
.8
.0
.2
.2
.2
.0
.2
.0
.6
.4
.4
.6
.6
.8
.2
.4
00077
TKANSP
StCCHI
INCHES
162








96








240







00094
CNDUCTVY
FIELD
MICROMHO
583
574
575
573
562
552
591
639
669
603
598
625
540
556
662
661
705
735
425
426
430
424
425
450
761
738
94
TVY
I
'MHO
583
574
575
573
562
552
591
639
669
603
598
625
540
556
662
661
705
735
425
426
430
424
425
450
761
738
00400
PH

SU
8.60
8.55
8.60
8.50
8.50
8.40
8.35
8.35
8.30
9.00
9.00
8.30
7.90
7.80
B.10
8.05
8.05
8.10
7.50
7.50
7.60
7.70
7.60
7.70
7.60
7.80
00410
T ALK
CAC03
MG/L
138
13B
139
137
138
137
144
13b
143
101
102
107
105
127
128
133
140
144
116
116
118
117
118
119
152
154
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020
0.030
0.040
0.030
0.030
0.020
0.030
0.030
0.020
0.020
0.020
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00625
TOT KJtL
N
MG/L
0.200
0.200
0.300
0.300
0.200K
0.200K
0.200
0.200K
0.200K
0.300
0.300
0.300
0.300
0.200
0.200
0.300
O.JOO
0.400
0.20 OK
0.200K
0.200K
0.200K
0.200
0.200K
0.200
0.200
00630
N02&N03
N-TOTAL
MG/L
0.380
0.390
0.390
0.390
0.400
0.440
0.500
0.560
0.620
0.040
0.020K
0.220
0.320
0.460
0.470
0.500
0.550
0.580
0.390
0.380
0.380
0.330
O.?70
0.290
0.600
0.600
00671
PHOS-OIS
ORTrlO
MG/L P
0.013J
0.003J
0.014K
0.014K
0.012K
0.006J
0.013K
0.015K
O.OOVJ
0.003
0.011
0.009
0.010
0.012
0.008
0.007
0.004
0.005
0.003
0.004
0.002
0.002K
0.002K
0.002
0.007
0.009
            K VALUE KNOWN TO BE LESS
                THAN INDICATED
            J VALUE KNOWN TO BE IN ERROR

-------
STORET RETRIEVAL DATE 76/11/26
NATL EUTROPMlCATION SURVEY
EPA-LAS VEGAS
                                                      040811
                                                     37 27 12.0 110 44 55,
                                                     LAivE POWELL
                                                     49037   ARIZONA
                                                               0 3
                                                                 HEPALtS  760109     2111202
                                                                  0999 FEET  DEPTH  CLASS 00
                      00665
  DATE   TIME DEPTH PHOS-TOT
  FROM    OF
   TO    DAY  FEET   MG/L P
75/04/29 10
         10
         10
         10
         10
         10
         10
         10
         10
75/08/15 16
         16
         16
         16
         16
         16
         16
         16
         16
75/12/03 09
         09
         09
         09
         09
         09
         09
         09
10 0000
10 0005
10 0015
10 0030
10 0055
10 OObO
10 0120
10 0170
10 0220
40 0000
40 0005
40 0025
40 0045
40 0075
40 0115
40 0155
40 0190
40 0225
00 0000
00 0005
00 0030
00 0080
00 0120
00 0160
00 0170
00 0230
0.015
0.011
0.013
0.012
0.010
0.006
0.008
0.009
0.012
0.011
0.011
0.010
0.009
0.009
0.009
0.008
0.008
0.009
0.013
0.009
0.009
0.008
O.OOH
O.U10
0.018
0.021
  32217
CHLHPHYL
   A
  UG/L

     1.7
                              00031
                            INCDT LT
                            RPMNING
                            PERCENT
     6.7
     0.9

-------
STORET RETRIEVAL DATE  76/11/26
NATL EUTROPHICATXON SURVEY
EPA-LAS VEGAS
                                              040812
                                             37  17  43.0 110 52 30.0 3
                                             LARE POKELL
                                             49037    ARIZONA
                                                                   11EPALES   760109      2111202
                                                                   0152 FEET  UEFTH   CLASS 00
  UATE   TIME DEPTH
  FROM    OF
   TO    DAY  FEET
 00010
WATtft
 TEMP
 CtNT
00300
 DO

MG/L
75/04/29






75/08/14








75/12/03






10
10
10
10
10
10
10
18
18
18
18
18
18
18
IB
18
15
15
15
15
15
15
15
00
00
00
00
00
00
00
15
15
15
15
15
15
15
15
IS
30
30
30
30
30
30
30
0000
0005
0025
0040
0060
0120
0146
0000
0005
0025
0045
0075
0105
0145
0185
0225
0000
0005
0040
0060
0110
0150
0175
11
11
10
10
9
8
7
25
25
23
20
15
12
8
6
5
12
12
11
11
11
10
9
.1
.0
.3
.0
.2
.1
.1
.7
.6
.8
.1
.6
.6
.4
.5
.6
.2
.1
.8
.8
.8
.7
.6
9
10
10
9
9
9
9
7
8
7
5
6
6
7
6
6
7
7
7
6
7
6
6
.6
.0
.0
.6
.6
.2
.0
.2
.2
.4
.6
.6
.8
.4
.8
.2
.0
.0
.2
.6
.0
.0
.0
00077
TxANSP
StCCHI
INCHES
240






120







264






00094
CNDUCTVY
FIELD
MICKOMHO
755
761
744
766
773
837
827
597
559
507
578
646
650
651
672
425
416
406
404
402
520
530
94
TVY

MHO
755
761
744
766
773
837
827
597

559
507
578
646
650
651
672
425
416
406
404
402
520
530
00400
PH

su
8.50
6.50
8.55
6.40
8.40
8.25
6.25
9.00
9.00
8.45
8.10
a.io
8.10
8.10
8.10
8.20
8.00
7.90
8.00
7.90
7.90
7.80
7.90
00410
T ALK
CAC03
M6/L
120
120
122
124
124
136
140
101
101
99
115
126
126
132
1J3
13d
lib
115
112
112
112

132
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020
0.030
0.020
0.020
0.030
0.020K
0.020
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K

0.020K
00625
TOT HJtL
N
MG/L
0.500
0.300
0.400
0.400
0.400
0.200K
0.200
0.200
0.400
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.400
0.200K
0.200K
0.200K
0.200K
U.200K
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.360
0.370
0.370
0.390
0.410
0.450
0.520
0.020
0.020K
0.080
0.400
0.480
0.460
0.460
0.500
0.540
0.350
0.380
0.360
0.350
0.350

0.520
00671
PHOS-OIS
ORTHO
MG/L P
0.005J
0.011J
0.012K
0.014K
0.012K
0.009K
0.009J
0.005
0.010
0.005
0.005
0.006
0.002
0.003
0.004
0.004
0.002K
0.002K
0.002
0.002K
0.002K

0.004
        K VALUE KNOWN TO BE LESS
            THAN INDICATED
        J VALUE KNOWN  TO 8E IN ERROR

-------
STORET RETRIEVAL DATE 76/11/36
NATL EUTROPH1CATION SURVEY
EPA-LAS VEGAS
 040812
37 17 43.0 110 52 30.0 3
LAKE HOXELL
49037   ARIZONA
                                                                 11EHALES  7601U9     2111202
                                                                  0152 FEET  DEPTH  CLASS 00

DATE
FROM
TO
75/04/29






75/08/14








75/12/03








TIME
OF
DAY
10
10
10
10
10
10
10
18
Id
18
18
18
18
18
18
18
15
15
15
15
IS
15
15


00
00
00
00
00
00
00
15
15
15
15
15
15
15
15
15
30
30
30
30
30
30
30

DEPTH

FEET
0000
0005
0025
0040
OObO
0120
0148
0000
0005
0025
0045
0075
0105
0145
0185
0225
0000
0005
0040
0060
0110
0150
0175
00665 32217 00031
PHOS-TOT CHLHPnYL INCDT LT
A PENNING
MG/L P UG/L PERCENT
0.010 1.2
0.011
0.010
0.010
0.009
0.007
0.009
0.012 4.7
0.013
0.011
0.008
0.008
0.008
0.009
0.009
0.009
0.018 1.1
0.008
0.007
0.006
0.007
0.009
0.012

-------
STORtT RETRIEVAL UATE 76/11/26
NATL EUTROPHICATIGN SUHVEY
EPA-LAS VEGAS
 040813
37 12 16.0 110 39 42.0 3
LAKE POWELL
4903T   ARIZONA
                                                                  11EPALES  760109     2111202
                                                                   0160 FEET  DEPTH  CLASS 00

GATE
FHOM
TO
75/04/28








75/08/15





75/11/24








TIHE
OF
DAY
14
14
14
14
14
14
14
14
14
12
12
12
12
12
12
13
13
13
13
13
13
13


35
35
35
35
35
35
35
35
35
10
10
10
10
10
10
50
50
50
50
50
50
50

DEPTH

FEET
0000
0005
0010
0015
0025
0050
0090
0110
0155
0000
0005
0025
0050
0100
0135
0000
0005
0020
0039
0070
0100
0141
00010
MATER
TtMP
CENT
13.0
12.8
12.2
11*8
11.7
10.8
10.6
9.7
9.1
27.4
27.0
26.3
20.3
15.2
11.7
13.4
13.3
13.2
13.2
13.2
13.0
11.5
                                 00300
                                  DO

                                 MG/L

                                   9.8
                                   9.2
                                   9.4
                                   9.4
                                   9.6
                                   9.4
                                   8.8
                                   8.0
                                   8.0
                                   8.4
                                   B.U
                                   8.0
                                   6.8
                                   5.6
                                   6.0
                                   7.4
                                   7.2
                                   7.0
                                   7.2
                                   7.2
                                   7.2
                                   4.2
00077
TRANSP
SECCHI
INCHES
204








96





7b






00094
CNDUCTYY
FIELD
MICROMHO
599
595
586
561
578
572
653
649
642
449
442
462
403
625
717
386
411
409
379
381
416
558
194
ITYY
1
IMHO
599
595
586
561
578
572
653
649
642
449
442
462
403
625
717
386
411
409
379
381
416
558
00400
PH

SU
B.50
8.50
8.40
8.40
8.40
8.20
8.40
8.20
8.30
9.00
8.95
8.90
8.00
8.00
8.00
7.20
7.10
7.00
7.10
7.20
7.00
7.10
00410
T ALK
CAC03
MG/L
120
120
121
120
117
116
127
126
128
75
76
78
94
119
132
112
112
109
105
105
110
131
00610
NH3-N
TOTAL
MG/L
0.030
0.020
0.020
0.020K
0.020K
0.020
0.040
0.090
0.060
0.020K
0.050
0.050
0.050
0.050
0.020K
0.020K
0.020K
0.020K
U.020K
0.020K
0.020K
0.020K
00625
TOT KJtL
N
MG/L
0.700
0.200K
0.200K
0.200K
0.200K
0.20 OK
0.200K
0.300
0.200
0.200
0.300
0.300
0.200
0.200
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.410
0.400
0.400
0.410
0.410
0.420
0.600
0.650
0.660
0.020K
0.030
0.020
0.290
0.440
0.590
0.290
0.290
O.?90
0.290
0.280
0.320
0.560
00671
PHOS-DIS
OHTHO
MG/L P
O.OOOR
0.015J
0.015J
0.017J
OoOlSJ
0.014K
0.019K
0.027J
0.020J
0.002
0.002
0.002
0.002
0.002
0.003
0.003
0.003
0.002
0.002
0.002
0.003
0.004
       K VALUE KNOW) TO BE LESS
           THAN INDICATED
      J VALUE KNOWN TO  BE  IN ERROR

-------
STORtT RETRIEVAL DATE 76/11/26
NATL EUTROPnICATION SURVEY
EPA-LAS VEGAS
 040813
37 12 16.0 110 39 42.0 3
LANE. POHELL
49037   ARIZONA
                                                                 UEPALES  760109     2111202
                                                                  0160 FEET  UEFTri  CLASS 00
  DATE
   TO
          OF
              FEET
75/04/26








75/08/15





75/11/24






14 35
14 35
14 35
14 35
14 35
14 35
14 35
14 35
14 35
12 10
12 10
12 10
12 10
12 10
12 10
13 50
13 50
13 50
13 50
13 50
13 50
13 50
0000
0005
0010
0015
0025
0050
0090
0110
0155
0000
0005
0025
0050
0100
0135
0000
0005
0020
0039
0070
0100
0141
0.019
0.023
0.024
0.042
0.017
0.012
0.017
1.220
0.054
0.011
0.008
0.007
0.007
0.007
0.009
0.011
0.009
0.009
0.009
0.009
0.013
0.013
0665
S-TOT

/L P
0.019
0.023
0.024
0.042
0.017
0.012
0.017
1.220
0.054
0.011
0.008
0.007
0.007
0.007
0.009
0.011
0.009
0.009
0.009
0.009
0.013
0.013
32217 OOOJ1
CHLRPMYL INCUT LT
A REHNING
uo/L PERCENT
1.3








4.b





1.7







-------
STORET RETRIEVAL DATE  76/11/26
NATL EUTROPHICATION SURVEY
tPA-LAS VEGAS
 040814
37 10 23.0 110 54 17.0  3
LAKE HOUELL
49037   ARIZONA
                                                                   11 El-ALES  760109     2111202
                                                                    0999  FEET  OEHTh  CLASS 00

DATE
FROM
TO
75/04/28








/5/08/14







75/11/24










TIME
OF
OAY
15
15
15
IS
15
15
15
15
15
17
17
17
17
17
17
17
17
14
14
14
14
14
14
14
14
14


45
45
45
45
45
45
45
45
45
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30

DEPTH

FEET
0000
0005
0025
0050
0060
0100
OlbO
0160
0200
0000
0005
0025
OObO
0090
0130
0165
0200
0000
0005
0025
0047
0060
0115
0155
0190
0230
00010
WATER
TEMP
CENT
10.8
10.6
10.2
10.0
9.9
8.6
7.4
6.7
6.2
24.1
23.8
23.5
18.7
14.0
9.1
7.2
5.9
13.1
13.2
13.2
13.2
13.1
13.0
10.4
8.9
7.5
                                 00300
                                  00

                                 MG/L

                                    9.6
                                    9.8
                                    9.8
                                    9.6
                                    9.6
                                    9.2
                                    8.8
                                    8.4
                                    8.6
                                    7.6
                                    7.4
                                    5.0
                                    6.6
                                    7.0
                                    7.4
                                    7.6
                                    5.6
                                    7.8
                                    7.2
                                    8.2
                                    7.2
                                    7.0
                                    6.6
                                    6.6
                                    7.0
                                    6.8
00077
TKANSP
SECCfil
INCHES
240








138







240








00094
CNDUCTVY
FIELD
MICHOMHO
563
562
555
552
551
532
547
563
573
602
591
581
500
573
662
645
661
386
390
388
417
416
436
549
515
596
94
TVY

MHO
563
562
555
552
551
532
547
563
573
602
591
581
500
573
662
645
661
366
390
388
417
416
438
549
515
596
00400
i-H

su
8.30
H.40
8.40
8.40
8.30
8.10
8.10
8.20
8.20
8.70
8.85
7.95
7.90
6.00
B.Ob
8.00
8.85
7.20
7.20
7.10
7.10
7.20
7.10
7.10
7.20
7.00
00410
T ALK
CAC03
MG/L
119
120
121
122
126
132
137
141
144
102
102
102
118
126
131
133
104
106
112
111
111
100
113
125
129
13b
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.030
0.020K
0.020
0.020K
0.020
0.020

0.020
0.020
0.030
0.030
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00626
TOT KJtL
N
MG/L
0.200
0.200K
0.200K
0.200K
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.300
0.200
0.200*
0.200K
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200K
0.200K
0.200K
00630
N028.N03
N-TOTAL
MG/L
0.390
0.380
0.390
0.390
0.390
0.440
0.500
0.540
0.580
0.060
0.050
0.240
0.440
0.460
0.450
0.540

0.300
0.320
0.320
0.320
0.310
0.380
0.500
0.530
0.580
00e>71
PHOS-OIS
ORTnO
MG/L P
O.OlbJ
0.013J
0.013J
0.015K
0.012J
0.011J
0.012K
0.0 16*
0.016K
0.009
0.002
0.011
0.012
0.011
0.011
0.012
0.009
0.003
0.002
0.003
0.002
0.002
0.002
0.004
0.005
0.007
        K VALUE KNOWN TO BE LESS
            THAN INDICATED
        J VALUE KNOKN TO BE  IN ERROR

-------
STOKET RETRIEVAL DATE 76/11/26
NATL EUTROPHICATION SURVEY
tPA-LAS VEGAS
 040614
37 10 23.0 110 54 17.0 3
LAKE POWELL
49037   ARIZONA
                                                                 UEPALtS  76010*
                                                                  0999 FEET  DEPTH
                     2111202
                   CLASS 00
  DATE   TIME DEPTh
  FROM    OF
   TO    DAY  FEET
75/04/28








75/08/14







75/11/24








15 45
15 45
15 45
15 45
15 45
15 45
15 45
15 45
15 45
17 30
17 30
17 30
17 30
17 30
17 30
17 30
17 30
14 30
14 30
14 30
14 30
14 30
14 30
14 30
14 30
14 30
0000
0005
0025
0050
0080
0100
0150
0160
0200
0000
0005
0025
0050
0090
0130
0165
0200
0000
0005
0025
0047
0080
0115
0155
0190
0230
0.015
0.013
0.013
0.014
0.012
0.011
0.010
0.012
0.013
0.011
0.009
0.009
0.011
0.009
0.008
0.009
0.012
0.008
0.008
0.008
0.008
0.008
0.007
U.OOH
0.012
0.013
0665 32217
S-TOT CHLRPHYL
A
/L P UG/L
0.015 0.9
0.013
0.013
0.014
0.012
0.011
0.010
0.012
0.013
0.011 5.3
0.009
0.009
0.011
0.009
o.ooa
0.009
0.012
0.008 1.9
o.ooa
0.008
0.008
0.008
0.007
U.OOH
0.012
0.013
00031
INCDT LT
REMN1NG
PERCENT



























-------
STORET RETRIEVAL OATE 76/11/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
                         040815
                        37 06 44.0  110  59  40.0  3
                        LAKE POWELL
                        49037   AK1ZONA
                                                                  11EPALES  760109     2111202
                                                                   0999 FEET  OEHTH  CLASS  00

DATE
FROM
TO
75/04/28







75/08/14







75/11/24








75/12/02










TIME DEPTH
OF
DAY
16
16
16
16
16
16
16
16
17
17
17
17
17
17
17
17
15
15
15
15
15
15
15
15
15
14
14
14
14
14
14
14
14


FEET
20
20
20
20
20
20
20
20
00
00
00
00
00
00
00
00
15
15
15
15
15
15
15
15
15
36
35
35
35
35
35
35
35
0000
0005
0025
0050
0080
0090
0150
0200
0000
0005
0015
0035
0060
0095
01J5
0170
0000
0005
0025
0042
0085
0130
0160
0190
0230
0000
0005
0035
0070
0130
0170
0210
0220
00010
MATtK
TEMP
CENT
11.2
11.1
11.1
10.7
10.5
8.9
6.9
6.3
24.4
24.8
24.8
21.5
15.7
12.3
9.1
7.0
13.0
13.0
13.0
13.0
13.0
11.7
10.2
8.7
7.4
11.7
11.8
11.7
11.7
11.5
9.4
8.3
7.6
                                 00300
                                  DO
                                 MG/L
                                    9.6
                                    9.6
                                    9.8
                                    9.8
                                    9.6
                                    9.2
                                    8.8
                                    9.0
                                    8.0
                                    8.0
                                    7.0
                                    5.2
                                    6.2
                                    6.2
                                    7.0
                                    7.0

                                    7.0
                                    7.6
                                    7.4
                                    7.4
                                    5.6
                                    6.6
                                    7.0
                                    7.2
                                    7.2
                                    7.2
                                    7.2
                                    7.4
                                    7.0
                                    6.2
                                    6.6
                                    6.4
 00077
TRANSP   O
SECCHI   FIELO
INCHES   MI

    252
    144
    240
    372
94
TVY

MHO
567





561
591
682
700
700
570
509
619
665
637
391
401
400
396
395
501
502
556
577
409
416
421
414
493
553
545
514
004QO
PH

su
8.UO
8.50
8.50
8.40
8.30
8.10
8.20
8.40
8.90
8.90
8.95
a. 10
7.95
8.00
8.10
8.10
7.10
7.20
7.10
7.00
7.20
7.00
7.00
7.10
7.10
8.00
b.OO
8.00
a. oo
8.00
7.90
7.80
7.80
00410
T ALK
CAC03
MG/L
129
136
135
135
134
134
141
146
10?
106
108
104
106
119
129
130
106
109
110
lOtt
120
137
138
144
145
113
lib
115
115
117
134
136
138
00610
NH3-N
TOTAL
MG/L
0.020K
0.02UK
0.020K
0.020K
0.020K
0.020
0.020K
0.020K
0.020
0.020
0.020K
0.020
0.030
0.020
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020
0.020K
0.020K
00625
TOT KJtL
H
MG/L
0.200K
O.^OOK
0.200
0.200K
0.200
0.200
0.200K
0.200
0.300
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*.
0.200K
0.200*.
0.200*
0.200K
0.200K
0.200K
0.200K
0.200
0.200K
0.200
00630
N02&N03
N-TOT4L
NG/L
0.380
0.370
0.370
0.370
0.380
0.420
0.550
0.600
0.120
0.100
0.100
0.240
0.380
0.160
0.460
0.470
0.320
0.310
0.300
0.300
0.300
0.450
0.480
0.530
0.590
0.330
0.320
0.320
0.320
0.360
0.530
0.580
0.590
00671
PHOS-OIS
0«TnO
MG/L P
O.Ol^K
0.013K
0.012K
0.003
0.002
0.003
0.003
0.012K
O.Oli
0.011
0.012
0.011
0.010
0.01U
0.006
0.012
0.007
0.003
0.002
0.002
0.002K
0.002K
0.002*
0.004
0.006
0.002K
0.002K
0.002*
0.002*
0.002K
0.005
0.005
0.005
          K VALUE KNOWN TO BE LESS
              THAN INDICATED

-------
STORE! RETfclEVA'w U6TE 76/H/26
MAIL EUTROPHICAT10W SURVEY
EPA-LAS VEGAS
 040815
37 06 44.0 110 59 *C.O 3
LAKE PO*£LL
49037   ARIZONA
                                                                  0999 FEET  Dfe>TH  CLASS  00
  DATE
  FHOM
   TO

75/04/28
75/08/14
75/11/24
75/12/02

TIME DEPTH
OF
DAY FEET
16 20 0000
16 20 0005
16 20 0025
16 20 0050
16 20 0080
16 20 0090
16 20 OlbO
16 20 0200
17 00 0000
17 00 OOOb
17 00 0015
17 00 0035
17 00 0060
17 00 0095
17 00 0135
17 00 0170
15 15 0000
15 15 0005
15 15 0025
15 15 0042
15 15 0085
15 15 0130
15 15 0160
15 15 0190
15 15 0230
14 35 0000
14 35 0005
14 35 0035
14 35 0070
14 35 0130
14 35 0170
14 35 0210
14 35 0220
00665
PHOS-TOT

MG/L P
0.012
0.012
0.011
0.011
0.011
0.010
0.008
0.008
0.010
0.016
0.009
0.009
0.008
0.009
0.008
0.014
0.015
0.008
0.008
O.OOB
0.008
0.006
0.007
0.011
0.011
0.006
0.006
0.006
0.007
0.008
0.010
0.011
0.011
32217 00031
CHLwPHYL INCDT LT
A REMNING
UG/L PEKCENT
1.2







4.3







2.2








0.9








-------
STORE! RETRIEVAL DATt 7e>/l 1/26
MAIL EUTROPHICATION
EPA-LAS VEGAS
                         040810
                        37 15 53.0 110 25 57.0  3
                        LAKE POrfELL
                        49037   ARIZONA
                                                                  11EPALES  760109     2111202
                                                                   0030 FEET  DEPTH  CLASS 00

OATE
FrfOM
TO
75/04/28




75/08/15



75/11/24




TIME
OF
DAY
13 55
13 55
13 55
13 55
13 55
11 30
11 30
11 30
11 30
13 20
13 20
13 20
13 20

DEPTH

FEET
0000
0005
0010
0015
0026
0000
0005
0015
0028
0000
000?
0022
0032
00010
«AT£R
TEMP
CENT
13.5
13.7
13.3
13.0
11.7
25.6
25.9
25.2
23.5
9.9
9.7
9.1
*.o
                                00300
                                 DO

                                MG/L

                                   8.6
                                   8.6
                                   7.8
                                   8.8
                                   8.4
                                   9.2
                                   9.0
                                   8.2
                                   5.8
                                   9.6
                                   9.4
                                   9.8
                                   10.4
 00077
TkANSP   CN
SECCHI   FIELD
INCHtS   MI

     12
     60
     54
94
TVY

MHO
471
475
468
596
57«
578
576
575
624
372
358
385
375
00400
PH

su
8.30
8.30
8.30
8.30
8.20
8.00
8.85
8.80
8.40
7.10
7.30
7.40
7.20
00410
T ALK
CACU3
HG/L
113
113
112
110
111
95
96
95
110
112
113
114
126
00610
NH3-N
TOTAL
MG/L
0.030
0.030
0.030
0.020
0.030
0.020K
0.060
0.020K
0.050
0.020K
0.020K
0.020K
0.020K
00625
TOT KJtL
N
MG/L
0.800
0.600
0.600
0.500
0.600
0.400
0.300
0.300
0.200
0.200K
0.200K
0.200K
0.200K
00630
N02kN03
N-TOTAL
MG/L
0.450
0.450
0.450
0.450
0.420
0.040
0.050
0.040
0.340
0.170
0.160
0.150
0.460
00b71
PHOS-DU
OUTHO
MG/L f
O.OSi>
O.OZ'O
0.02f>
0.02t_,
O.Oix.,
0.00'
0.02>
0.00*-
0.02,
0.00
O.OOr
O.OOr
O.OU
  DATE   TIME DEPTH
  FROM    OF
   TO    DAY  FEET

75/04/28 13 55 0000
         13 55 0005
         13 55 0010
         13 55 0015
         13 55 0026
75/08/15 11 30 0000
         11 30 0005
         11 30 0015
         11 30 0028
75/11/24 13 20 0000
         13 20 0005
         13 20 0022
         13 20 0032
0665
S-TOT

/L P
0.077
O.ObO
0.049
0.054
0.075
0.029
0.025
0.022
0.026
0.022
0.020
0.017
C.067
32217
CHLRPHYL
A
UG/L
1.5




8.7



9.2



00031
INCDT LT
REMNING
PEKCENT













                    K VALUE KNOWN TO BE LESS
                        THAN INDICATED

                   J VALUE KNOWN TO BE  IN ERROR

-------
STOHET RETRIEVAL JATE 76/11/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
 040817
37 20 54.0 110 56  10.0
LAKE HOWELL
49025   ARIZONA
                                                                  11EPALES  760109     2111202
                                                                   0160  FEET  DEPTH  CLASS 00

UATE
FHOM
TO
75/04/29






75/08/15







75/12/04








TIME
OF
DAY
09
09
09
09
09
09
09
18
18
18
18
18
18
18
18
09
09
09
09
09
09
09


10
10
10
10
10
10
10
20
20
20
20
20
20
20
20
45
45
45
45
45
45
45

DEPTH

FEET
0000
0005
0020
0030
0050
0100
0155
0000
0005
0020
0050
0070
0110
0150
0191
0000
0005
0020
0080
0120
0140
0180
00010
MATEH
TfcMP
CENT
12.1
12.0
10.6
9.6
8.8
7.7
8.6
27.9
27.4
27.0
21.0
18.7
12.8
9.1
8.7
11.8
11.8
11.8
11.8
11.4
10.6
8.7
                                00300
                                 00

                                MG/L

                                   9.6
                                   9.6
                                  10.0
                                   9.8
                                   9.0
                                   7.2
                                   2.7
                                   8.4
                                   8.6
                                   8.4
                                   4.8
                                   3.2
                                   5.6
                                   4.0
                                   1.2
                                   6.8
                                   7.2
                                   6.8
                                   6.8
                                   6.6
                                   5.6
                                   8.2
00077
THAixSP
SECCHI
INCHES
204






120







180






00094
CNDUCTVY
FIELD
MICROMHO
579
599
591
747
741
736
997
163
760
755
555
706
607
578
655
415
416
425
419
409
477
482
94
TVY

MHO
579
599
591
747
741
736
997
163
760
755
555
706
607
578
655
415
416
425
419
409
477
462
00400
PH

SU
8.20
8.35
8.40
8.20
8.25
8.00
7.80
8.60
8.75
7.90
7.80
7.80
7.80
7.70
7.50
7.80
7.80
7.80
7.80
7.80
7.60
7.50
00410
T ALK
CAC03
MG/L
123
121
119
119
119
120
143
110
109
111
117
133
136
141
151
120
120
118
119
119
127
134
00610
NH3-N
TOTAL
MG/L
0.030
0.020K
0.020K
0.020K
0.020
0.020
0.020
0.020
0.030
0.030
0.030
0.030
0.020
0.030
0.050
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0062b
TOT KJtL
N
MG/L
0.300
0.200K
0.300
0.400
0.400
O.«00
0.300
0.600
0.200
0.200
0.300
0.200
0.200
0.200
0.200
0.200K
0.200K
0.200K
0.200K
0.200
0.200K
0.200
00630
N02&N03
N-TOTAL
MG/L
0.160
0.140
0.200
0.290
0.350
0.350
0.540
0.100
0.110
0.100
0.350
0.370
0.360
0.400
0.400
0.300
0.290
0.290
0.300
0.230
0.440
0.420
00o71
PHOS-OIS
U»TrlO
MG/L "
0.014K
0.011J
0.013J
0.012J
0.011J
0.003J
0.014J
0.012
0.007
0.002K
0.002K
0.002K
0.006
0.019
0.029
0.002K
0.003
0.002K
0.002K
0.002K
0.002K
0.005
     K VALUE KNOWN TO BE LESS
         THAN INDICATED
     J VALUE KNOWN TO BE IN ERROR

-------
STORE! KtTHIEVAL UATt 76/11/26
NATL EUTROPH1CATION SUHVEY
EPA-LAS VEGAS
 040617
37 20 54.0 110 56 10.0 3
LAKE POKELL
49025   ARIZONA
                                                                  UEHAL.es  760109      2111202
                                                                  0160 FEET  OE^Trt  CLASS  00
DATE
TO
75/04/29






75/08/15







75/12/04






TIME DEPTH
OF
DAY FEET
09
09
09
09
09
09
09
18
18
18
18
18
18
18
18
09
09
09
09
09
09
09
10
10
10
10
10
10
10
20
20
20
20
20
20
20
20
45
45
45
45
45
45
45
0000
0005
0020
0030
0050
0100
0155
0000
0005
0020
OObO
0070
0110
0150
0191
0000
0005
0020
0080
0120
0140
0180
066S 32217
S-TOT CHLHPHYL
A
/L P OG/L
0.011 1.5
0.013
0.018
0.013
0.018
0.009
0.019
0.009 3.9
0.011
0.009
0.008
0.007
0.008
0.024
0.046
0.009 0.9
0.006
0.008
0.009
0.009
0.009
0.069
00031
INCDT LT
REMNING
PERCENT























-------
STORET RETRIEVAL GATE 76/11/26
NATL EUTROPhlCATION SURVEY
EPA-LAS VEGAS
 040818
37 33 13.0 110 46 29.0 3
LAKE POWELL
49017   ARIZONA
                                                                  11EPALES  760109     2111202
                                                                   0056 FEET  DEPTH  CLASS 00

DATE
FROM
TO
75/04/29




75/06/15




75/11/25




75/12/02






TI*E DEPTH
Of
DAY
09
09
09
09
09
15
Ib
15
15
15
10
10
10
10
10
14
14
14
14


FEET
30
30
30
30
30
30
30
30
30
30
50
50
50
50
50
35
35
35
35
0000
0005
0015
0030
0052
0000
0005
0025
0045
0070
0000
0005
0015
0025
0036
0000
0005
0030
0065
00010
4ATER
TEMP
CENT
10.5
10.5
9.7
9.1
9.1
27.4
27.4
25.9
22.9
19.1
13.6
12.4
12.4
12.4
12.4
11.2
11.2
11.0
10.6
                                 00300
                                 00
                                MG/L
                                   9.6
                                   9.6
                                   9.6
                                   9.6
                                   9.4
                                   8.0
                                   7.8
                                   5.8
                                   2.4
                                   1.8

                                   5.6
                                   7.8
                                   7.8
                                   7.8
                                   8.2
                                   8.2
                                   8.4
                                   8.2
00077
TKANSP
stccm
INCHES
162




72




120




174



00094
CNOUCTVY
FIELD
MICHOMHO
575
570
558
550
550
600
599
580
533
590
428
425
412
415
413
440
430
417
412
94
TVY

MHO
575
570
558
550
550
600
599
580
533
590
428
425
412
415
413
440
430
417
412
00400
PH

SU
8.50
8.50
8.45
8.40
8.40
8.95
8.95
8.60
7.80
7.65





8.10
8.10
8.10
8.10
00410
T ALK
CAC03
MG/L
140
137
138
137
139
108
107
107
110
123
116
lit)
115
120
121
115
116
117
113
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020
0.020
0.030
0.020
0.030
0.040
0.040
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.400
0.200
0.200
0.200
0.200K
0.300
0.400
0.400
0.300
0.300
0.400
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.410
0.410
0.420
0.430
0.430
0.300J
0.020K
0.080
0.280
0.400
0.280
0.280
0.280
0.280
0.270
0.320
0.310
0.310
0.300
00671
PHOS-DIS
O^THO
M6/L P
0.012*
0.012*
0.012*
0.011*
O.Ollu
0.005
O.OOS
0.004
0.012
0.013
0.004
0.002*
0.00£<
0.002*
0.002*
0.002r
O.OOfct
0.002r
0.002r
1)0665 32217 00031
DATE
FROM
TO
75/04/29




75/08/15




75/11/25




75/12»«02

TIME DEPTH
OF
DAY
09
09
09
09
09
15
15
15
15
15
10
10
10
10
10
14
14


FEET
30
30
30
30
30
30
30
30
30
30
50
50
50
50
50
£5
35
0000
0005
0015
0030
0052
0000
0005
0025
0045
0070
0000
0005
0015
0025
0036
0000
0005
PHOS-TOT CHLRPHYL INCDT LT

MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
A REMNING
P UG/L PEHCENT
Oil 1.5
Oil
010
009
Oil
Oil 6.3
012
013
010
030
013 2.1
009
009
010
Oil
009 1.3
0.010
« n F /"•
                                                               K VALUE KNOWN TO BE LESS
                                                                   THAN INDICATED

                                                               J VALUE KNOWN TO BE IN ERROR

-------
STOWET RETRIEVAL DATE  76/11/36
NATL EUTHOPHICATION SURVEY
EPA-LAS VEGAS
 040819
37 01 03.0 111  19 40.0 3
LAKE KO«£LL
49037   ARI^UNA
                                                                  11EPALES  760109      2111302
                                                                   0999 FEET  DEPTH   CLASS  00

DATE
FROM
TO
75/04/29






75/08/14








75/12/02









TIME
OF
DAY
11
11
11
11
11
11
11
IS
15
15
15
15
15
15
15
15
13
13
13
13
13
13
13
13


00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
35
35
35
35
35
35
3b
35

DEPTH

FEET
0000
0005
0030
0060
0100
0150
0250
0000
0005
0020
0040
0070
0110
0150
0190
0225
0000
0005
0035
0080
0130
0170
0200
0220
00010
MATER
TEMP
CENT
10.9
10.8
10.4
9.8
8.4
7.3
6.8
25.7
25.4
25.0
19.2
16.1
12.2
9.3
7.1
5.8
12.4
12.2
12.2
12.1
12.0
9.7
8.3
7.2
                                 00300
                                  00

                                 MG/L

                                   9.8
                                   9.4
                                   9.4
                                   9.0
                                   8.0
                                   4.4
                                   6.6
                                   8.0
                                   8.8
                                   9.2
                                   6.8
                                   6.1
                                   6.0
                                   7.4
                                   5.4
                                   6.8
                                   7.4
                                   6.2
                                   7.0
                                   7.0
                                   7.0
                                   6.0
                                   6.2
                                   6.4
00077
TrtANSP
SECCHI
INCHES
204






204








324







00094
CNDUCTVY
FIELD
MICROMHO
791
801
784
826
897
931
994
929
931
921
672
645
595
644
632
670
488
493
520
480
520
519
508
508
94
TVY

MHO
791
801
784
826
897
931
994
929
931
921
672
645
595
644
632
670
488
493
520
480
520
519
508
508
00400
PM

su
B.50
8.50
8.40
8.20
8.00
8.00
8.00
8.65
8.70
8.70
8.70
8.35
8.15
8.10
8.05
8.00
8.00
8.00
8.00
8.00
8.00
7.90
7.80
7.80
00410
T ALK
CAC03
MG/L
13V
139
137
140
141
152
155
118
125
11V
119
116
119
128
130
135
135
138
122
122
121
130
131
134
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.040
0.040
0.020
0.020K
0.050
0.020
0.020
0.020
0.020K
0.020K
0.020K
0.020K
U.020K
0.020K
0.020K
0.020K
0062b
TOT KJEL
N
MG/L
0.300
0.300
0.200
0.200
0.200
0.200K
0.200K
0.200K
0.200*
0.200K
0.200K
0.200
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.380
0.380
0.400
0.400
0.480
0.630
0.660
0.190
0.400J
0.200
0.190
0.350
0.430
0.430
0.490
0.560
0.520
0.560
0.310
0.280
0.300
0.480
0.520
0.560
00671
PHOS-DIS
ORThO
MG/L P
0.010K
0.011K
0.013K
0.004
0.003
0.012K
0.016K
0.002
0.010
0.010
0.011
0.002
0.009
0.008
0.010
0.012
0.002K
0.002K
0.002K
0.002*
0.002K
0.002K
0.002K
0.002K
            K VALUE KNOWN TO BE LESS
                THAN INDICATED

-------
STOKfcT KETRIEVAL DATE 76/11/36
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
 040819
37 01 03.0 111 19 40.0 3
LAKE POWELL
49037   ARIZONA
                                                                 11EPALES  760109     2111202
                                                                  0999 FEET  DEPTH  CLASS 00
  DATE
  FKOM
   TO

75/04/25
75/08/14
75/12/02



TIME DEPTH
OF
DAY
11
11
11
11
11
11
11
15
15
15
15
15
15
15
15
15
13
13
13
13
13
13
13
13


FEET
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
35
35
35
35
35
35
35
35
0000
0005
0030
0060
0100
0150
0250
0000
0005
0020
0040
0070
0110
0150
0190
0225
0000
0005
0035
0080
0130
0170
0200
0220
00665 32217 00031
PHOS-TOT CHLRPHYL INCDT LT
A REMNING
MS/L P UG/L PEHCENT
0.009 1.3
0.009
0.010
0.010
0.008
0.007
0.013
0.008 2.7
0.008
0.007
0.008
0.011
0.008
0.006
0.008
0.009
0.005 1.5
0.006
0.006
0.006
0.007
0.005
0.006
0.006

-------