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                            WATER QUALITY STUDY

                GRAND LAKE, SHADOW MOUNTAIN LAKE, LAKE GRANBY

                                  COLORADO

                                    1974
                       TECHNICAL INVESTIGATIONS BRANCH
                     SURVEILLANCE AND ANALYSIS DIVISION
                    U. S. "ENVIRONMENTAL PROTECTION AGENCY
                                REGION VIII
                                 JULY 1977
Document Is available to the public from the National  Technical  Information
Service, U.S. Dept. of Commerce, Springfield, VA  22161

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                              DISCLAIMER
     This report has been reviewed by the Surveillance and Analysis Division,
U.S. Environmental Protection Agency, Region VIII, and approved for publica-
tion.  Mention of trade names or commercial  products does not constitute
endorsement or recommendation for use.

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                                ABSTRACT
     To develop additional information on the effect of point  and  non-
point sources of wastes and on the trophic condition of the three  lakes,
the Technical Investigation Branch, Surveillance and Analysis  Division,
Region VIII, EPA conducted an investigation of Grand, Shadow Mountain,
and Granby Lakes.  The study, conducted in June and repeated again in
September, 1974, concentrated on 1) the determination of the existing
nutrient level in each of the lakes; 2) the determination of the existing
organic and nutrient loadings from point and non-point sources;  and 3) the
determination of the probable consequences of increased nutrient levels
in the three lakes as regards nuisance algal growths.  Sampling  was con-
ducted at 71 locations throughout the study area.
                                    ii

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                          TABLE OF CONTENTS

                                                                        Page
LIST OF FIGURES  	  1v
LIST OF TABLES   	   v
INTRODUCTION	   1
SUMMARY AND CONCLUSIONS 	   2
DESCRIPTION OF STUDY AREA	   5
SURVEY METHODS   	   8
RESULTS OF STUDY	12
     I.  Existing Nutrient Levels in the Three Lakes  	  14
    II.  Organic and Nutrient Loading from Tributaries and  	  24
         Wastewater Treatment Facilities
   III.  Microbiology	34
    IV.  Biology	39
              Lake Stratification Measurements  	  39
              Primary Productivity Study  	  49
              Aquatic Plant Survey	  52
              Phytoplankton Survey  	  52
              Algal  Growth Potential  of the Three Lakes	64
              A Laboratory Study
APPENDICES
         APPENDIX A - Survey Data	74
         APPENDIX B - Cross-Sections,^ Grand,  Shadow Mountain	201
                      Granby Lakes
         APPENDIX C - References	214
                                   111

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                              LIST OF  FIGURES

Figure No.                                                            Page
     1.        General  Location  Map -  Grand  Lake,  Shadow  .......  6
               Mountain Lake,  Lake Granby
     2.        Station  Location  flap -  Grand  Lake  ...........  9
     3.        Station  Location  Map -  Shadow Mountain  Lake  ...... 10
     4.        Station  Location  Map -  Lake Granby   .......... 11
     5.        Temperature  Profile, Station  50, Grand  Lake  ...... 41
     6.        Temperature  Profile, Station  41, Station 37,   ..... 42
               Station  28,  Shadow Mountain Lake
     7.        Temperature  Profile, Station  5, Lake Granby  ...... 43
     8.        Temperature  Profile, Station  8, Lake Granby  ...... 44
     9.        Temperature  Profile, Station  9, Lake Granby  ...... 45
     10.        Temperature  Profile, Station  20, Lake Granby ...... 46
     11.        Aquatic  Plant Survey, Shadow  Mountain Lake ....... 53
               June  16, 1974
     12.        Aquatic  Plant Survey, Shadow  Mountain Lake ....... 54
               July  17, 1974
     13.        Aquatic  Plant Survey, Shadow  Mountain Lake,  ...... 55
               September 17, 1974
     14.        The Effect on the  Seven-Day Maximum Standing ...... 71
               Crop  of  Sel enastrum Capri cornutum of Various
               Nutrient Additions to water taken from  Lake
               Granby,  Shadow Mountain Lake  and Grand  Lake,
               Colorado, 1974.

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                           LIST OF TABLES


Table No.                                                                 Page

     1.    Colorado Water Quality Standards  Summary 	   13

     2.    Average Total  Nitrogen Concentrations  in Grand  Lake   	   15

     3.    Average Nitrite plus  Nitrate  Concentrations  in  Grand  	   16
          Lake

     4.    Average Total  Phosphorus Concentrations  in Grand  Lake  ....   17

     5.    Average Orthophosphate Concentrations  in Grand  Lake   	   18

     6.    Average Total  Nitrogen Concentrations  in Shadow  	   19
          Mountain Lake

     7.    Average Nitrite and Nitrate Concentrations in Shadow  	   21
          Mountain Lake

     8.    Average Total  Phosphorus Concentrations  in Shadow 	   22
          Mountain Lake

     9,    Average Orthophosphate Concentrations  in Shadow  	   23
          Mountain Lake

    10.    Average Total  Nitrogen Concentrations  in Lake Granby  	   25

    11.    Average Total  Nitrogen Concentrations  in Lake Granby  	   26

    12.    Average Nitrite and Nitrate Concentrations in Lake 	   27
          Granby

    13.    Average Total  Phosphorus Concentrations  in Lake Granby  ....   28

    14.    Average Orthophosphate Concentrations  in Lake Granby  	   29

    15.    Tributary Loadings Measure in Populated  Areas   	   30

    16.    Tributary Loadings Measured in  Non-Populated Areas 	   31

    17.    Summary - Tributary Loadings  in Populated and   	   32
          Non-Populated  Areas

    18.    Organic,  Nutrient, Solids, and Microbiological  Loading  ....   33
          From Grand Lake Wastewater Treatment Plant

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                            List of Tables  -  Continued


Table No.                                                                   Page

  19.      Fecal  Streptococcus Identification-Number of Strains	37
           and Percent of Total, June, 1974

  20.      Fecal  Streptococcus Identification-Number of Strains	38
           and Percent of Total, September, 1974

  21.      pH Values in the Three Lakes and The Colorado River 	  47

  22.      Dissolved Oxygen Concentrations  in the Three Lakes	48
           and the Colorado River

  23.      Primary Productivity Rates  and Illumination  Depths	50
           for the Three Lakes

  24.      Previously Reported Productivity Rates	51

  25.      Phytoplankton Data From Grand Lake -   	  56
           Middle (Station 50)

  26.      Phytoplankton Data From Shadow Mountain Lake -  	  57
           North  End (Station 41)

  27.      Phytoplankton Data From Shadow Mountain Lake -  	58
           Middle (Station 37)

  28.      Phytoplankton Data From Shadow Mountain Lake -  	  59
           (Station 28)

  29.      Phytoplankton Data From Lake Granby -  	  60
           Arapahoe Arm (Station 5)

  30.      Phytoplankton Data From Lake Granby -  	  61
           Middle (Station 14)

  31.      Phytoplankton Data From Lake Granby -  	62
           Colorado River Arm (Station 10)

  32.      Phytoplankton Data From Lake Granby -  	  63
           North  End (Station 20)

  33.      Concentrations of Ammonia Nitrogen in the 	  66
           Three  Lakes and the Colorado River

  34.      Concentrations of Total Kjeldahl Nitrogen in  	  67
           the Three Lakes and the Colorado River


                                    vi

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                           List of Tables - Continued
Table No.                                                                    Page
  35.       Concentrations of Nitrite and Nitrate in the	  68
            Three Lakes and the Colorado River
  36.       Concentrations of Total  Phosphate in the 	  69
            Three Lakes and the Colorado River
  37.       Concentrations of Orthophosphate in the  	  70
            Three Lakes and the Colorado River
                                    vii

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                          INTRODUCTION
     Grand Lake, Shadow Mountain Lake, and Lake Granby, surrounded by the
scenic natural setting of Rocky Mountain National Park and the Arapahoe
National Forest, have received increasing attention over the years as a
valuable recreational resource area.  The great appeal of this type of natural
setting has led to the development of numerous tourist facilities and summer
homes along the shores of each of the lakes.

     As development continued over the years and became ever more sprawling,
concern about the effects of this growth on the water quality of the lakes
became an issue of increasing importance.  This concern prompted numerous
investigations of the three lakes area by Federal, State and local agencies
and institutions (Pennak, 1955; EPA, 1970; Nelson, 1971; Kugrens & Paulsen,
1972).

     A recent proposal by the Three Lakes Water and Sanitation District
called for the elimination of point-source discharges from wastewater
treatment facilities as well as individual septic tank treatment systems
in the drainage area of the three lakes.  To develop additional information
on the effect of point and non-point sources of wastes and on the trophic
conditions of the three lakes, an investigation of Grand, Shadow Mountain,
and Granby Lakes was conducted.  This investigation was conducted in two
phases.  Phase I, conducted in June, 1974, was developed to define water
quality prior to the heavy-use summer season.  Phase II, conducted in
September of the same year, was to define water quality after the summer
season.  The study concentrated on the following objectives:

     1.   To determine the existing nutrient level in each of the Three Lakes.

     2.   To determine the existing organic and nutrient loadings from
          point and non-point sources to the Three Lakes where possible,
          specifically, the organic and nutrient loading from the Grand
          Lake wastewater treatment plant, the National Park campground,
          individual septic tank type systems and other contributory inputs.

     3.   To determine the probable consequences of increased nutrient
          levels in the Three Lakes as regards nuisance algal growths.

     The investigation as related to item (3) included a laboratory study
of the algal growth potential of each of the three lakes.  Also included
was an algal assay of the Colorado River outlet from Lake Granby to determine
the algal  growth potential of water leaving the three lakes system.

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                         SUMMARY AND CONCLUSIONS


     The intensive two-phase sampling program conducted in the Three  Lakes
system during the summer and fall of 1974 has produced  a significant  amount
of current water quality and biological  information which should  aid  in making
knowledgeable decisions concerning the future management of natural resources
in the Three Lakes area.  A serious attempt has  been made to respond  as
clearly as possible to the objectives presented  in the  introductory section
of this report.  The following discussion summarizes the major findings
of this study.

     1.   In accordance with the first objective, organic, nutrient,  and
          microbiological point source and tributary loadings to  the  Three
          Lakes have been measured and tabulated.  The  major point-source discharge
          to the Three Lakes (Grand Lake Wastewater Treatment Plant), although
          contributing no more than 2% of the total measured pollution load
          (organic and nutrient) entering the Three Lakes during  the  early
          low-tourist impact period, produced approximately 9% of the BOD
          load and 20% of the total phosphorus load entering the  Three
          Lakes during the late summer heavy-use season.

     2.   Non-point source pollution contribution was reflected in the fact
          that, during the late summer sampling  period, four tributary
          streams draining areas of significant  population densities  contributed
          approximately one-half of the flow entering the Three Lakes from
          all tributaries but almost three-fourths of the suspended  solids and
          total phosphorus loads.  Coliform densities were also approximately
          20 times higher in these four streams  than in the other six streams
          draining non-populated areas.   It was  not possible to determine
          site-specific, non-point source loadings other than to  determine
          upstream loadings above possible man-caused pollution and  downstream
          loadings at the stream mouth.   Such measurements on Stillwater  Creek
          and the North Fork of the Colorado River showed that increases  in
          downstream organic, solids, and nutrient loadings ranged from
          150 to 500% and from 50.to 120%, respectively for the various
          parameters in the two streams in September 1974.  Soda  Creek
          did not exhibit similar increases in pollution loads because the
          downstream flow was greatly reduced by upstream diversions.

     3.   Intensive near-shore lake sampling in  areas containing  significant
          numbers of septic tank systems (particularly  the Grand  Lake
          shoreline) did not identify any problem with  microbiological
          pollution of the Three Lakes from septic tank systems.   However,
          fecal coliform concentrations in Little Columbine Creek, which
          drains the Columbine Lake recreation home development area, ranged
          as high as 3000 per 100 ml in September.

     4.   Fecal streptococcus typing was conducted on samples from several
          selected areas, and the results suggest the possibility that, at
          certain times, human fecal contamination exists near the Shadow

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     Mountain Lake boat docks, in the Grand Lake Mastewater Treatment
     Plant effluent, and near the mouths of Stillwater,  Soda,  and  Little
     Columbine Creeks.  Continued microbiological monitoring in  these
     areas appears warranted.

5.   Measurements to determine the existing nutrient levels in each of
     the Three Lakes showed significant seasonal variation in  total
     nitrogen and total phosphorus concentrations in Grand Lake, with
     less variation noted in Shadow Mountain Lake and Lake Granby.
     Except for nitrite plus nitrate, there does not appear to be  a
     significant increase in nutrient concentration with depth in  any
     of the lakes.  When bottom sediments were slightly  disturbed
     during bottom water sampling, the total nitrogen and total
     phosphorus concentrations increased approximately 3 and 7.5 times,
     respectively.

6.   Dissolved oxygen concentrations in the lakes at mid- and  maximum
     depths were generally not greatly depleted, except  for Grand  Lake
     at the maximum depth (1.7 mg/1).  Other than this one "low" value,
     dissolved oxygen concentrations were slightly higher than pre-
     viously reported values.  However, there is insufficent data  to
     conclude that dissolved oxygen concentrations in the Three  Lakes
     have either improved or deteriorated since the earlier studies.

7.   Primary productivity values were determined for each lake and,
     in general, were low.  No increases in values reported during
     studies conducted six and nine years earlier were noted.

8.   On the basis of the nutrient concentrations and productivity  values
     obtained during this study, each of the Three Lakes could presently
     be classified as mesotrophic to eutrophic.  However, this trophic
     status should not be considered a completely stable condition in
     view of the present and past history of nuisance aquatic plant
     growths in Shadow Mountain Lake and the past history of large
     numbers of blue green algae along with lower dissolved oxygen
     concentrations in the Three Lakes.

9.   Aquatic plant growths of El odea sp. increased very significantly
     in areal coverage in Shadow Mountain Lake during the summer of 1974.

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10.    Algal  assays conducted in the laboratory revealed  that increases
      in nutrient concentrations in the Three Lakes  could  result in
      increased algal  productivity.  In general,  algal growth in each
      of the Three Lakes of the time of sampling  was limited by nitrogen
      concentrations.   Additions of nitrogen  and  phosphorus  in combination
      usually resulted in the highest standing crops observed.  Grand
      Lake exhibited,  at the time of sampling, a  possible  secondary
      limitation of a  nutrient other than  nitrogen or phosphorus.  Dry
      weight yields in the controls indicated a moderate to  moderately
      high primary productivity potential.  Due to incongruities
      in the algal  assay and associated chemical  data, additional
      algal  assays are felt necessary.

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                     DESCRIPTION OF STUDY AREA


     Grand Lake, Shadow Mountain Lake and Lake Granby (The Three  Lakes)
are located in Grand County, Colorado, north of the Town of Granby and
within a three hour drive from the Denver metropolitan area (Figure 1).
The Three Lakes, surrounded almost entirely by Rocky Mountain  National Park
and the Arapahoe National Forest, are a major attraction of the area.

     The Three Lakes encompass a drainage basin of approximately  1,023
square kilometers (395 sq. mi.) which includes the Colorado River and
nine other tributary streams (Figure 1).  The basin contains large areas
of National Forest lands and much smaller areas of livestock grazing lands,
mountain subdivisions, and tourist facilities.  The various land-use types
have been identified in previous studies of the area.

     The basin also includes the largest natural body of water in the
State of Colorado - Grand Lake.  This lake has a maximum depth greater
than 61 meters (200 ft), a surface area of 204 hectares (504 acres) and
a normal surface elevation of 2, 551 meters (8,367 ft).  It also  serves  as
the home of the world's highest registered yacht anchorage and the tradi-
tional Lipton Cup Race in August of each year.  Natural tributary inflow
to Grand Lake is via the North Inlet and East Inlet streams.  Additional
inflow is received at times from man-made Shadow Mountain Lake.  Water
leaves Grand Lake either via the Alva B. Adams tunnel under the Continental
Divide to the east or by natural gravity flow westward into Shadow Mountain
Lake.  Both exit routes are part of the overall design of the Colorado-
Big Thompson Project which was built by the Bureau of Reclamation in the
late 1940's primarily to provide additional irrigation water for  Eastern
Colorado.  Today the waters of the Three Lakes serve additional diverse
purposes, such as power production, fishing, boating, water contact sports,
and public water supplies.

     Shadow Mountain Lake is impounded by a low concrete dam across the
Colorado River downstream from Grand Lake and is fed naturally by the North
Fork of the Colorado River and by overflow from Grand Lake, or, alternatively,
by pumped flow from Lake Granby via the Granby Pump Canal.  Water can,
therefore, move in either direction through Shadow Mountain Lake, depending
on Eastern Slope water supply demands.  The lake has an average depth of
3 meters (10 ft) and a surface area of 749 hectares (1852 acres)  at a max-
imum surface elevation of 2,551 meters (8,367 ft).  Although provisions  are
incorporated to permit drawing down Shadow Mountain Lake without  affecting
Grand Lake, the normal practice is to maintain the two lakes at the same
elevation.

     Lake Granby provides the majority of water storage for the Colorado-
Big Thompson Project.  It is fed by the outflow from Shadow Mountain Lake,
the Willow Creek Canal from Willow Creek Reservoir, and by six significant
tributaries.  Lake Granby has an average depth of 22.6 meters (74 ft) and
a surface area of 2,938 hectares (7,260 acres) at a maximum surface elevation
of 2,524 meters (8,190 ft).  The outlet of the face of Granby Dam is set

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                                 Lt. Columbine  Cr.
Figure  1. General location map.  Grand  Lake,  Shadow Mountain Lake,




           Lake Granby.

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between elevations 2,485 meters (8,150 ft) and 2,497 meters (8,190 ft), but
active storage extends downward to elevation 2,496 meters (8,186 ft), provid-
ing a maximum drawdown of 28.6 meters (94 ft).

     The normal flow pattern in the Three Lakes during spring runoff periods
from May through June is from Grand Lake through Shadow Mountain Lake to
Lake Granby.  From July through April, depending, on seasonal  Eastern Slope
water demands, water is pumped from Lake Granby through Shadow Mountain Lake
to Grand Lake where it exits through the Adams Tunnel.

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                               SURVEY METHODS
     To determine existing water quality conditions in Grand Lake, Shadow
Mountain Lake, Lake Granby and tributaries, the following sampling stations
were established:  (1) fifty-five locations in the lakes at selected cross-
sections and other points, (2) thirteen locations on the tributaries feeding
the three lakes, (3) one location on the Colorado River immediately down-
stream from Lake Granby, and (4) the effluent from the Grand Lake Wastewater
Treatment Plant and the Shadow Mountain Recreation Area STP Pond (Figures 2,
3, and 4).

     All water quality samples collected were "grab" type samples.  Field
determinations were made for temperature, pH, conductivity, dissolved
oxygen, alkalinity and turbidity, with additional samples collected for
laboratory analyses.  The laboratory determinations included 5-day bio-
chemical oxygen demand, total coliform, fecal coliform, fecal Streptococcus,
suspended solids, and nutrients (nitrogen and phosphorus series).  Chlorine
residual was determined in the field at the two wastewater treatment
facilities.   Flow measurements were made in conjunction with tributary
and wastewater treatment plant sampling.  All analyses were made in accord-
ance with recommended procedures from Standard Methods, 13th Edition.

     The biological  portion of the investigations of Grand Lake, Shadow
Mountain Lake, and Lake Granby consisted of two major subdivisions:
(1) laboratory algal assays to determine the growth-limiting nutrient and
(2) determination of the present trophic status of the three lakes by use
of C-14 methodology.   Basic chemical  parameters of alkalinity, pH, temperature
and dissolved oxygen were monitored periodically throughout the summer
(June - September).   During this same time span, water samples for plankton
analysis were also collected.  The gradual increase in relative abundance
of aquatic plants was also noted during the study period.

     A detailed description of station locations and results of all analyses
appear in Appendix A.  Depth profiles recorded at selected transects on
each of the  three lakes appear in Appendix B.
                                   8

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                  GRAND LAKE
-
                                                                                                         Tunntl
                                                                                                      Out/ft
                                                                         0.5 KM
                Figure  2«  Station location map - Grand Lake.

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  North  Fork
   Colorado
    Rivtr
  Recreation
Area STP Pond
                                                           Lit tit  Columtiin* Crrt*
                                                              43 Grand Lake STP
                                                                            Outlft
                                                                          1  KM
                                                                   1 MILE
               Grenoy Pump Canal
                                                       Co/orta'f ffivir
  Figure   3.  Station  location map - Shadow Mountain Lake,
                                      10

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                                                                                       1 MILE
                                                                                           Roaring Fork
Figure  4. Station  location map -  Lake Granby.
                                                                                              Arapaho  Crtt*

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                         RESULTS OF STUDY
     Since algal blooms were first observed in the Three Lakes system in
the 1950's, there has been concern over nutrient enrichment and accelerated
eutrophication of the lakes.  The mechanics of eutrophication are complex,
but it has long been recognized that nitrogen and phosphorus are important
nutrients contributing to the eutrophication of a lake or reservoir.  As a
result of his study of the Wisconsin lakes, Sawyer (1947) concluded that
concentrations of inorganic nitrogen in excess of 0.30 mg/1 as N and inor-
ganic phosphorus in excess of 0.01 mg/1 as P at the start of the active
growing season could be expected to produce nuisance algal blooms.  Under
certain conditions, waters containing higher concentrations of nutrients
(nitrogen and phosphorus) than that considered acceptable do not become
eutrophic.  Likewise, there are waters where populations of nuisance
organisms thrive where the concentrations of nutrients are lower than that
considered as maximum.  Because each body of water can react differently
to a given nutrient input, it is recommended that any standards for
nutrients be established on a case-by-case basis and that nutrient
budgets and algal assays be used in establishing these standards.

     As a general guide, it is recommended that the concentration of total
phosphorus not be allowed to exceed levels of 0.1 mg/1 as P in flowing
waters, 0.05 mg/1 in any stream entering a lake or reservoir, and 0.025
mg/1 within a lake or reservoir (EPA, 1976).  Although the State of
Colorado has not established numerical standards for nutrients, the water
quality standards do call for Class A] waters (the present classification
for the Three Lakes) to be free from substances and conditions or com-
binations thereof in concentrations which produce undesirable aquatic
life.   A summary of Colorado Water Quality Standards for Class A]
waters appears in Table 1.
                                   12

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                                TABLE 1
                 COLORADO WATER QUALITY STANDARDS SUMMARY
        Standard                           Class Aj
Settleable Solids
Floating Solids
Color, Odor, Taste
Toxic Materials
Oil and Grease
Radioactive Material
Total .Coliform Bacteria
Fecal Coliform Bacteria

Fecal Streptococcus

Dissolved Oxygen
pH
Temperature
Turbidity
Essentially Free
Essentially Free
Essentially Free
Essentially Free
Essentially Free
Drinking Water Standards
Geometric Mean of less than 1000/100 ml
from five samples in a 30 day period
Geometric Mean of less than 200/100 ml
from five samples in a 30 day period
Monthly Average of less than 20/100 ml
from five samples in a 30 day period
6.0 mg/1 minimum
6.5 - 8.5
Maximum 68° F.  Maximum change 2° F.
Ho increase of more than 10 J.T.U.
                                     13

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 I.   Existing Nutrient Levels in the Three Lakes

     Grand Lake

     Results of the water quality sampling in Grand Lake indicated higher
 surface concentrations of total nitrogen in June than in September (3-day
 averages of 0.360 mg/1 and 0.266 mg/1 respectively).  Nitrogen concentra-
 tions at the bottom sampling points also averaged approximately 0.1 mg/1
 higher in June than in September.  The higher total nitrogen concentrations
 in June may be due to the tributary contribution which averaged slightly
 over 1,300 Ibs/day for the three-day sampling period.  This loading to
 the  lake is not simply a result of high flows in June as the actual
 concentrations of total nitrogen in the North and East inlet tributaries
 averaged about twice as high in June as in September.  The total nitrogen
 load contributed by the two tributaries to Grand Lake in September averaged
 only about 20 Ibs/day, a result of decreased stream flow and decreased
 nitrogen concentrations in the streams.  There is no indication from
 the data that near-shore concentrations of total nitrogen increased along
 the more densely populated shore areas.  Although nitrite plus nitrate
 concentrations increased with depth, there appears to be no consistent
 gradient of total nitrogen concentrations in Grand Lake.  As shown in
 Tables 2 and 3, nitrite plus nitrate concentrations generally comprised
 less than 10% of the total nitrogen concentration.

     Both surface and bottom concentrations of total phosphorus were over
 three times higher in June (0.021 mg/1) than in September (0.006 mg/1).
 This difference is reflected also by the tributary contributions of
 total phosphorus during the June and September sampling periods (84
 Ib/day and 0.19 Ib/day, respectively).  In, general, the variation in total
 phosphorus concentrations appears to be of a completely random nature
 which prevents one from drawing conclusions regarding human impact upon
 specific areas of Grand Lake.  The variability also extends to the
 orthophosphate concentrations, which comprised approximately 10% of the
 total phosphorus concentration (Tables 4 and 5).

     Shadow Mountain Lake

     Average total nitrogen concentrations in Shadow Mountain Lake for
 the three-day sampling periods in June and September, ranged from a low
 of 0.218 mg/1  to a high of 0.498 mg/1 for surface water samples (Table
 6).  At 13 out of 15 sampling locations the average concentrations were
 higher in June (0.379 mg/1)1  than in September (0.272 mg/1)'.  This same
 trend is evident for total nitrogen concentrations measured in bottom
water samples.   In June the average concentration for the four mid-lake
 bottom sampling locations was 0.404 mg/1  (omitting "stirred up" samples)
whereas the September samples averaged only 0.273 mg/1 total nitrogen.


 1 These values  represent the  average total nitrogen (TKN + N02 +
 concentration  for all  15 sampling locations.

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                                      TABLE 2
                  AVERAGE TOTAL NITROGEN CONCENTRATIONS IN GRAND LAKE
                                                  Quarter Points
Cross-Section
Stations
45
46-47-48
49-50-51
53-54-55
56
Depth
S
B
S
M
B
S
M
B
S
M
B
S
B
1
June
0.371
0.334
0.430
0.349
0.437
0.311
0.349
0.431
0.430
0.383
Sept.
0.322
0.282
0.336*
0.254
0.245
0.241
0.189
0.260
0.265
0.282
2
dune
_
0.351
0.316
0.407
0.346
0.316
0.463*
0.290
0.475
0.579
-
Sept.
_
0.284
0.139
0.252
0.291
0.197
0.433
0.248
0.230
0.331
-
3
June
-
0.290
0.400
0.383
0.232
0.336
0.283
0.310
-
Sept,
-
0.291
0.359
0.208
0.262
0.241
0.199
:
S = surface
M = depth to thermocline
B = bottom

*At least one data value omitted because lake bottom was stirred up during sampling.

All concentrations in mg/1 as N (TKN + N02 + N03).

Quarter point designations correspond to cross-section stations in increasing
numerical order.

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ov
                                                   TABLE 3


                           AVERAGE NITRITE + NITRATE CONCENTRATIONS IN GRAND LAKE


                                                               Quarter Points
oi uaa-oe^u lull
Stations
45
46-47-48
49-50-51
53-54-55
56
Depth
S
B
S
M
B
S
M
B
S
M
B
S
B
1
June
0.027
0.034
0.027
0.029
0.027
0.031
0.029
0.034
0.025
0.029
Sept.
0.002
0.002
0.001
0.001
0.002
0.001
0.025
0.057
0.002
0.002
June

0.028
0.036
0.044
0.026
0.040
0.087
0.026
0.035
0.082

2
Sept.

0.001
0.039
0.045
0.001
0.021
0.156
0.001
0.027
0.117

June

0.027
0.030
0.027
0.037
0.036
0.027
0.030

3
Sept.

0.001
0.003
0.001
0.042
0.001
0.019

             S = surface
             M = depth to thermocline
             B - bottom

             All concentrations in mg/1 as N.

             Quarter point designations correspond to cross-section stations in increasing
             numerical order.

-------
                                       TABLE 4
                 AVERAGE TOTAL PHOSPHORUS CONCENTRATIONS IN GRAND LAKE
                                                   Quarter Points
ross-aection
Stations
45
46-47-48
49-50-51
53-54-55
56
Depth
S
B
S
M
B
S
M
B
S
M
B
S
B
1
June
0.009
0.061
0.009
0.018
0.020
0.012
0.019
0.027
0.022
0.022
Sept.
0.011
0.007
0.012*
0.007
0.008
0.005
0.002
0.012
0.004
0.007
2
June
—
0.009
0.014
0.031
0.052
0.035
0.018*
0.015
0.022
0.063
-
Sept.
«
0.006
0.004
0.007
0.005
0.002
0.007
0.005
0.002
0.003
mi
3
June
»
0.010
0.036
0.035
0.015
0.027
0.028
0.022
-
Sept.
«.
0.005
0.013
0.004
0.005
0.005
0.006
-
S = surface
M = depth to thermocline
B = bottom

*At least one data value omitted because lake bottom was stirred up during sampling.

All concentrations in mg/1 as P.

Quarter point designations correspond to cross-section stations in increasing
numerical order.

-------
                                                   TABLE 5
                               AVERAGE ORTHOPHOSPHATE CONCENTRATIONS IN GRAND LAKE
                                                               Quarter Points
00
urubb-aection
Stations
45
46-47-48
49-50-51
53-54-55
56
Depth
S
B
S
M
B
S
M
B
S
M
B
S
B
1
June
0.003
0.042
0.003
0.007
0.002
0.001
0.002
0.003
0.002
0.002
Sept.
0.003
0.002
0.004
0.001
0.002
0.002
0.001
0.002
0.001
0.002
2
June

0.002
0.005
0.004
0.002
0.002
0.006
0.002
0.005
0.008

Sept.

0.002
0.002
0.003
0.001
0.002
0.002
0.001
0.001
0.002

June

0.002
0.005
0.002
0.001
0.004
0.003
0.002

3
Sept.

0.002
0.002
0.001
0.002
0.001
0.002

            S = surface
            M = depth to thermocline
            B = bottom

            All concentrations in mg/1 as P.

            Quarter point designations correspond to cross-section stations in increasing
            numerical order.

-------
                                      TABLE 6


             AVERAGE TOTAL NITROGEN CONCENTRATIONS IN SHADOW MT. LAKE


                                                  Quarter Points
Cross-Section
Stations
26
27-28-29
32-33-34
35
36-37-38
39
40-41-42
Depth
S
S
B
S
B
S
S
B
S
S
B
1
June
0.469
0.334
0.453
0.348
0.392
0.309
0.319
Sept.
0.320
0.264
0.222
0.228
0.259
0.225
0.309
2
June
-
0,389
0.506*
0.335
0.455
-
0.326
0.279*
-
0.282
0.378
Sept.
-
0,454
0.284
0.230
0.256
-
0.253
0.280
-
0.285
3
June
-
0.495
0.431
-
0.302
-
0.498
Sept.
-
0.291
0.279
-
0.236
-
0.218
S = surface
M = depth to thermocline
B = bottom

*At least one data value omitted because lake bottom was stirred up during sampling.

All concentrations in mg/1 as N (TKN +
Quarter point designations correspond to cross-section stations in increasing
numerical order.

-------
At least part of the differences observed when comparing results from the
June and September sampling periods can be attributed to the complex
hydrodynamic characteristics interrelating Grand, Shadow Mountain, and
Granby Lakes.  For instance, the higher total nitrogen average surface
concentration observed in June in Shadow Mountain Lake (0.379 mg/1) was
likely due to the influence of incoming water from Grand Lake containing
an average total nitrogen concentration of 0.360 mg/1, plus the total
nitrogen contributed to Shadow Mountain Lake by tributaries and the Grand
Lake STP (908 Ib/day).  However, during the September sampling period, the
flow had been reversed so that Shadow Mountain Lake was receiving water
from Lake Granby via the pump canal.  The reduced average total nitrogen
concentration in Shadow Mountain Lake in September (0.272 mg/1) may have
been influenced to a large extent by incoming water from Lake Granby con-
taining an average total nitrogen concentration of approximately 0.320
mg/1 measured in the pump canal and by greatly reduced tributary and
STP loadings (55 Ib/day).  Additional factors related to complex biological
processes may have also contributed significantly to the differences in
total nitrogen concentrations observed in Shadow Mountain Lake during
the June and September 1974 studies.  Increased aquatic plant growth in
September could have substantially reduced the total nitrogen available
in water solution during this period.  As was the case for Grand Lake, the
NOo + N03 concentrations were quite low, comprising less than 5% of the
total nitrogen concentrations in Shadow Mountain Lake.

     Total phosphorus concentrations measured in Shadow Mountain Lake were
fairly similar during the two study periods, ranging from an average sur-
face concentration of 0.023 mg/1 in June to 0.017 mg/1 in September
(Table 8).  Only one station (#28) had a three-day average total phosphorus
concentration in excess of 0.05 mg/1, and that was due to one unaccountably
high value of 0.106 mg/1 measured on June 14, 1974.  Orthophosphate con-
centrations were in most cases less than 0.005 mg/1.

     As previously noted for samples collected near the bottom of Lake
Granby, nutrient concentrations in the bottom water increase dramatically
when the bottom sediments are disturbed during water sampling.  Three
"disturbed" bottom water samples taken from the middle of Shadow Mountain
Lake contained an average of 1.803 mg/1 total nitrogen and 0.269 mg/1 total
phosphorus.  Clearly, the bottom sediments have the potential to contribute
significant amounts of nitrogen and phosphorus to the lake waters.

     Lake Granby

     There were no large variations in nitrogen concentrations among the
19 sampling stations on Lake Granby during the June and September surveys.
The highest three-day average concentration was 0.534 mg/1 (Station 10 -
bottom sample at Grand Bay in the Colorado River Arm) while the lowest
                                   20

-------
ro
                                                     TABLE 7


                         AVERAGE NITRITE + NITRATE CONCENTRATIONS IN SHADOW MT. LAKE


                                                                 Quarter Points
Cross-Section
Stations
26
27-28-29
32-33-34
35
36-37-38
39
40-41-42
Depth
S
S
B
S
B
S
S
B
S
S
B
1
June
0.002
0.001
0.002
0.001
0.002
0.002
0.013
Sept.
0.073
0.020
0.002
0.002
0.002
0.002
0.002
2
June

0.002
0.001
0.002
0.001

0.002
0.009

0.008
0.025
Sept.

0.041
0.050
0.003
0.006

0.003
0.003

0.002
3
June

0.001
0.001

0.002

0.002
Sept.

0.047
0.006

0.002

0.002
               S = surface
               M = depth to thermocline
               B - bottom

               All concentrations in mg/1  as N.

               Quarter point designations  correspond to cross-section stations in increasing
               numerical order.

-------
ro
                                                    TABLE 8

                         AVERAGE TOTAL PHOSPHORUS CONCENTRATIONS IN SHADOW MT. LAKE

                                                                Quarter Points
Ul UOD-OC(-L IUII
Stations
26
27-28-29
32-33-34
35
36-37-38
39
40-41-42
Depth
S
S
B
S
B
S
S
B
S
S
B
1
June
0.017
0.015
0.019
0.017
0.023
0.015
0.016
Sept.
0.015
0.015
0.079
0.018
0.016
0.016
0.017
2
June
-
0.052
0.065*
0.015
0.053
-
0.015
0.019*
-
0.015
0.036
Sept.
-
0.035
0.015
0.015
0.019
-
0.017
0.012
-
0.015
3
June
-
0.032
0.028
-
0.027
-
0.037
Sept.
-
0.014
0.017
-
0.014
-
0.017
              S =  surface
              M -  depth  to  thermocline
              B =  bottom
              *Atleast one  data  value omitted  because  lake  bottom was  stirred  up  during sampling.
              All  concentrations in mg/1  as  P.
              Quarter point designations  correspond to cross-section  stations  in  increasing
              numerical  order.

-------
INJ
CO
                                                      TABLE  9


                           AVERAGE ORTHOPHOSPHATE  CONCENTRATIONS IN SHADOW MT.  LAKE


                                                                  Quarter Points
cross-Section
Stations
26
27-28-29
32-33-34
35
36-37-38
39
40-41-42
Depth
S
S
B
S
B
S
S
B
S
S
B
June
0.005
0.002
0.005
0.004
0.004
0.004
0.003
1
Sept.
0.005
0.003
0.003
0.003
0.002
0.002
0.002
June

0.036
0.007
0.003
0.006

0.003
0.010

0.003
0.004
2
Sept.

0.017
0.003
0.002
0.003

0.001
0.001

0.001
June

0.004
0.004

0.004

0.004
3
Sept.

0.003
0.002

0.001

0.001
               S =  surface
               M =  depth  to  thermocli ne
               B =  bottom

               All  concentrations  in mg/1  as  P.

               Quarter  point designations correspond to cross-section stations in increasing
               numerical  order.

-------
 average  concentration was 0.189 mg/1  (Station 17-surface sample near
 western  shoreline).  Bottom concentrations, in general, were approximately
 0.1 mg/1  higher than surface concentrations.  However, when the bottom
 sediments were disturbed while collecting bottom water samples, the
 average  total nitrogen concentration  increased to 0.780 mg/1, compared
 to 0.306 mg/1 for undisturbed samples.  The data showed no significant
 differences  in total nitrogen concentrations between mid-lake samples
 and near-shore samples, except for the Arapahoe Bay samples (Station 2)
 and one  sample collected near a marina on the western shoreline (Station 17).
 The above exceptions averaged approximately 0.1 mg/1 higher than other
 stations  (Table 10 and 11).  There did not appear to be a definite total
 nitrogen gradient with depth at the mid-lake stations.

     Total phosphorus concentrations  in Lake Granby were generally uniform
 throughout and averaged 0.014 mg/1 at the surface and 0.021 mg/1 at the
 bottom for all samples except those collected at Station 22 (Table 13).
 This station is located near the campground boat launching area in Stillwater
 Bay and, during the June survey only, it averaged 0.147 mg/1 total phosphorus
 for a three day period.  Results from the eight samples collected after
 bottom disruption by sampling equipment indicate an average total phosphorus
 concentration of 0.137 mg/1.  Samples collected from near-shore locations
 did not appear to contain more phosphorus than those collected in mid-lake.

 II.  Organic, Nutrient, and Microbiological Loading from Tributaries and
     Wastewater Treatment Facilities

     In June 1974, 22% of the total tributary flow to the Three Lakes
 occurred in the populated areas drained by Stillwater Creek, Soda Creek,
 Little Columbine Creek and the North Fork of the Colorado River (Tables 15-18)
 This 22% of the total flow contributed the following percentages of the total
 tributary pollution load to the Three Lakes:  BOD5 - 24%; TSS - 58%; Total
 Nitrogen - 31%; and Total Phosphorus - 46%.  Also during June, Total and
 Fecal Coliform densities averaged (geometrically) approximately 80 times
 higher in these four streams in the populated areas than in the non-populated
 areas.

     During the September 1974 study, the four streams draining the populated
 areas contributed 45% of the total tributary flow to the Three Lakes.  This
 45% of the flow contributed the following percentages of the total tributary
 pollution load to the Three Lakes:  BODc - 41%; TSS - 71%; Total Nitrogen -
 36%; and Total Phosphorus - 75%.   Total and Fecal Coll form densities in
 the four streams draining populated areas averaged (geometrically) approx-
 imately 20 times higher than in streams draining non-populated areas.  The
comparisons above support the conclusion that man's activities in the
 populated areas of the Three Lakes region has led to higher loadings of
TSS, Total Phosphorus, and Fecal  Coliforms in the Three Lakes.
                                  24

-------
                                     TABLE 10


             AVERAGE TOTAL NITROGEN CONCENTRATIONS IN  LAKE  GRANBY
Cross-Section
   Stations      Depth


2                  S
                   B

4-5-6              S
                   M
                   B

7-8-9              S
                   M
                   B

10                 S
                   B

13-14-15           S
                   M
                   B

16                 S
                   M
                   B

17                 S
                   B
S « surface
M « depth to thermocHne
B » bottom
Quarter Points
1
June
0.472
0.365
0.415
0.327
0.292
0.282
0.287*
0.256
0.432
0.274
0.322
0.263
0.218
0.241
0.189
0.232
Sept.
0.388
0.362
0.315
0.355
0.254
0.265
0.344*
0.295
0.534
0.228
0.268
0.299
0.236
0.324
0.383
2
June
-
0.303
0.337
0.278*
0.272
0.275
0.314
-
0.254
0.243
0.301*
:
-
Sept.
.
0.308
0.238
0.342
0.258
0.285
0.328
-
0.318
0.286
0.441
-
-
3
June
-
0.293
0.336
0.255
0.290
0.283
-
0.271
0.281*
-
-
Sept.
_
0.248
0.306
0.288
0.254
0.309
-
0.260
0.319
-
-
*At least one data value omitted because lake  bottom was  stirred up during sampling.

All concentrations 1n mg/1  as N (TKN + NOg +
Quarter point designations correspond to cross-section  stations  In  increasing
numerical order.
                                     25

-------
PO
                                                     TABLE 11

                             AVERAGE TOTAL  NITROGEN CONCENTRATIONS IN LAKE GRANBY

                                                                 Quarter Points
Cross -Sect ion
Stations
18
19-20-21
22
23
Depth
S
B
S
M
B
S
B
S
B
1
June
0.201
0.218
0.236
0.241
0.252
0.252
0.233*
Sept.
0.266
0.208
0.369
0.295
0.299
0.269
0.279
2
June Sept.
-
0.244 0.303
0.199
0.377 0.453*


3
June Sept.
-
0.202 0.266
0.349 0.436


                S =  surface
                M =  depth  to  thermocline
                B =  bottom
                All  concentrations  in mg/1  as  N  (TKN + N02 +  N03).
                *At  least  one data  value  omitted because  lake bottom was  stirred  up during sampling.
                Quarter point designations  correspond to  cross-section  stations in increasing
                numerical  order.

-------
                                     TABLE 12
             AVERAGE NITRITE AND NITRATE CONCENTRATION IN LAKE GRANBY
Cross-Section
   Stations

2


4-5-6



7-8-9



10


13-14-15



16



17


18


19-20-21



22


23
Depth

  S
  B

  S
  M
  B

  S
  M
  B

  S
  B

  S
  M
  B

  S
  M
  B

  S
  B

  S
  B

  S
  M
  B

  S
  B

  S
  B
Quarter Points
1
June
0.032
0.028
0.002
0.024
0.002
0.029
0.055
0.003
0.062
0.001
0.002
0.004
0.018
0.051
0.002
0.002
0.001
0.005
0.003
0.004
0.002
0.002
0.016
Sept.
0.001
0.002
0.001
0.001
0.001
0.015
0.064
0.002
0.097
0.002
0.002
0.002
0.002
0.098
0.003
0.003
0.002
0.002
0.002
0.002
0.002
0.003
June

0.002
0.002
0.054
0.002
0.015
0.067

0.001
0.006
0.061



0.001
0.019
0.024


2
Sept.

0.001
0.036
0.096
0.002
0.005
0.105

0.001
0.009
0.111



0.003
0.003


3
June Sept.

0.003 0.001
0.009 0.002
0.002 0.001
0.013 0.018
0.060 0.112

0.002 0.003
0.006 0.002



0.002 0.003
0.003 0.003


S » surface
M = depth to thermocllne
B = bottom

All concentrations In mg/1 as N.

Quarter point designations correspond to cross-section stations 1n Increasing
numerical order.
                                      27

-------
                                     TABLE  13
               AVERAGE TOTAL PHOSPHORUS CONCENTRATIONS IN LAKE GRANBY
 Cross-Section
    Stations      Depth
 2                  S
                   B

 4-5-6              S
                   M
                   B

 7-8-9              S
                   M
                   B

 10                 S
                   B

 13-14-15           S
                   M
                   B

 16                 S
                   M
                   B

 17                 S
                   B

 18                 S
                   B

 19-20-21           S
                   M
                   B

22                 S
                   B

 23                 S
                   B
Quarter Points
1
June
0.006
0.009
0.013
0.015
0.016
0.011
0.009*
0.010
0.046
0.017
0.035
0.017
0.016
0.024
0.016
0.016
0.019
0.017
0.025
0.025
0.147
0.017
0.022*
Sept.
0.017
0.017
0.014
0.015
0.013
0.013
0.012*
00.13
0.026
0.013
0.020
0.011
0.012
0.026
0.015
0.012
0.015
0.013
0.014
0.012
0.015
0.020
2
June
_
0.014
0.012
0.017*
0.012
0.012
0.013
-
0.015
0.019
0.023*
;
_
.
0.013
0.015
0.036
-
-
Sept.
-
0.014
0.014
0.027
0.011
0.012
0.014
-
0.012
0.014
0.013
-
.
-
0.012
0.015*
-
-
3
June
-
0.015
0.015
0.011
0.012
0.008
.
0.014
0.015*
;
-
-
0.017
0.029
-
-
Sept.
-
0.015
0.017
0.010
0.010
0.013
-
0.011
0.021
-
-
-
0.014
0.029
-
-
S = surface
M = depth to thermocline
B = bottom

*At least one data value omitted because lake bottom was stirred up during sampling.

All concentrations in mg/1 as P.

Quarter point designations correspond to cross-section stations in Increasing
numerical order.
                                     28

-------
                                    TABLE  14
                AVERAGE ORTHOPHOSPHATE  CONCENTRATIONS  IN LAKE GRANBY
Cross-Section
S  Stations


2


4-5-6



7-8-9



10


13-14-15



16



17


Ib


19-20-21



22


23
Depth


  S
  B

  S
  M
  B

  S
  M
  B

  S
  B

  S
  M
  B

  S
  M
  B

  S
  B

  S
  B

  S
  M
  B

  S
  B

  S
  B
Quarter Points
June
0.002
0.003
0.003
0.003
0.003
0.003
0.006
0.003
0.008
0.004
0.005
0.005
0.004
0.007
0.006
0.005
0.007
0.003
0.015
0.011
0.137
0.006
0.007
1
Sept.
0.004
0.003
0.002
0.003
0.003
0.003
0.005
0.002
0.008
0.001
0.002
0.002
0.002
0.006
0.002
0.002
0.001
0.001
0.002
0.003
0.004
0.004
June

0.002
0.003
0.005
0.004
0.003
0.004

0.004
0.003
0.010



0.004
0.003
0.004


2
Sept.

0.002
0.003
0.007
0.002
0.002
0.005

0.001
0.003
0.005



0.001
0.005


3
June Sept.

0.003 0.003
0.003 0.004
0.003 0.002
0.003 0.002
0.003 0.006

0.003 0.001
0.007 0.002



0.004 0.003
0.006 0.005


S = surface
M = depth to thermocHne
B = bottom

All concentrations In mg/1  as P.

Quarter point designations  correspond to cross-section  stations  1n  Increasing
numerical order.
                                      29

-------
                                                             TABLE  15
                                         TRIBUTARY LOADINGS MEASURED IN POPULATED  AREAS*
                                                          (MULTIPLE  USE)
ita.
24
25
31
44
Name
Stillwater
Soda
North Fork
Colorado
Little
Columbine
Flow
cfs
June
36.2
2.8
325
3.7
Sept
1.8
0.04
34.3
2.7
Loading
BOD5
June Sept
234 17.5
<16.6 0.6
<1927 <185
<19.9 <17.5
TSS
June
7024
151
33280
239
Sept
38.8
6.7
740
102
T-N
June
111
11.2
858
9.4
Sept
4.9
0.2
27.7
4.2
Ib/day
N02 4
June
5.1
0.1
12.3
0.4

• N03
Sept
0.9
0.002
0.6
0.07


T-P
June
30.3
1.1
54.3
1.4
Sept
1.2
0.04
3.0
3.2


0-P04
June
13.3
0.7
14.0
0.8
Sept
0.9
0.03
1.1
0.2
    Totals
368
38.8    <2198 <221
40694   888
990
37
17.9   1.57
                                                                                                        87
                                                                                             7.4
28.8   2.23
*Areas drained by Stillwater Creek, Soda Creek, Little Columbine Creek, and the North Fork of the Colorado  River.

-------
                                                          TABLE 16
                                      TRIBUTARY LOADINGS MEASURED IN NON-POPULATED  AREAS
                                                                          Loading   Ib/day
Sta.
#
1
3
11
12
52
57
Name
Arapahoe
Creek
Roaring
Fork Cr.
Twin Creek
Columbine
Creek
North Inlet
East Inlet
Flow
cfs
June
504
61.3
20.0
27.7
259
406
Sept
19.2
2.8
0.8
2.1
13.2
10.1
BODc
June Sept
<2716 166
<330 <15
<108 <4.3
<149 <11.3
<1536 <71
<2188 <54
TSS
June Sept
10866 207
991 <15
755 4.3
597 <11.3
6980 <71
8753 54
T-N
June
733
89.2
19.4
29.9
433
875
Sept
42.5
1.24
0.59
1.80
11.6
8.3
N02 +
June
92.4
13.2
0.3
0.9
36.3
48.1
Wh T-P
Sept
0.4
0.2
0.01
0.02
0.4
0.3
June
10.9
2.6
1.1
4.2
29.3
54.7
Sept
2.1
0.09
0.03
0.06
0.14
0.05
0-PO,
June
5.4
1.0
0.4
0.3
4.2
6.6
Sept
0.3
0.02
0.01
0.01
0.07
0.05
Totals
1278
48.2
<7027  <322
28942 <363
2180
66
191
1.3
103
2.5
17.9  0.5

-------
                                  Table 17
                          Loadings, Ib/day
Populated Area
Non-Populated Area
Parameter
Flow (cfs)
BOD5
TSS
T-N
N02 + N03
T-P
0-P04
June
1278
7027
28942
2180
191
103
17.9
Sept.
48.2
322
363
66
1.3
2.5
0.5
Populated Area*
June
368
2198
40694
990
17.9
87
28.8
Sept.
38.8
221
888
37
1.57
7.4
2.23
Loading as % of Total
June
22.4
23.8
58.4
3T.2
8.6
45.8
61.7
Sept.
44.6
40.7
71.0
35.9
54.7
74.7
81.7
* Area drained by Stillwater Creek,  Soda Creek,  Little Columbine Creek,  and the
  North Fork of the Colorado River.
                                     32

-------
                              TABLE 18
      ORGANIC, NUTRIENT, SOLIDS, AND MICROBIOLOGICAL LOADING FROM
                 GRAND LAKE WASTEWATER TREATMENT PLANT
                              STATION #43

Flow

BODg
TSS
Total -Nc
Total -P
Total Coli.
Fecal Coli.
BOD5
TSS
Total -N
Total -P
BOD5
TSS
Total -N
Total -P

cfs
cms
mg/1
tng/1
mg/1
mg/1
no/ 100 ml
no/100 ml
Ib/day
Ib/day
Ib/day
Ib/day
kg/day
kg/day
kg/day
kg/day
June
0.37a
0.01
34
27
9.8
1.89
1240b
565b
68
54
20
3.8
31
24
9.1
1.7
September
0.67
0.02
15
30
7.1
1.79
2262b
71 9b
54
108
25.6
6.5
24
49
11.6
3.0
a - The main STP lift station was out of operation during the June sampling
    period.  Plant personnel reported that an average flow of 240,000 gallons
    per day (0.37 cfs) would be normal for this time of year.

b - Geometric Mean

c - TKN + N02 + N03
                                   33

-------
      During  June  1974,  a  period  of  high  tributary  flows  and  low tourist
 impact,  the  effect of the discharge from the Grand Lake  STP  on the Three
 Lakes system was  quite  minor when compared  to  pollution  contributted by
 the  ten  tributary streams.  The  STP contributed  only approximately two
 percent  as much total phosphorus as entered the  Three Lakes  via the ten
 tributary streams,  while  all other  STP pollution loads were  less than one
 percent  of the tributary  load.

      However, during  the  September  study the Grand Lake  STP  contributed
 the  following approximate loads  expressed as a percentage of the total
 tributary loads:   Flow  -  1%; BOD5 - 10%;  TSS - 9%; T-N - 25%; and T-P - 66%.
 The  STP  must, therefore,  be considered a  significant source  of nutrient
 enrichment for the  Three  Lakes,  especially  during  periods of low natural
 stream flow.  However,  in order  to  gain  a complete understanding of the
 relative impact of  the  STP on the Three  Lakes  system, it would be necessary
 to measure pollution  leads from  the STP  and the  tributary streams for a
 complete cycle of  seasons.

 III.  Microbiology

      Total and Fecal Coliform Data

      Bacteriological measurements are often used to help define the sanitary
 quality  of bodies of water.  These  measurements  usually include tests for
 determining the densities of the various  types of  coliform microorganisms.
 In general, the total coliform group includes  varying proportions of micro-
 organisms that may  have only limited sanitary  significant, while the fecal
 coliform group, a subgroup of the total coliforms, is more directly related
 to the presence of  possible pathogenic contamination of the water.  Although
 not necessarily pathogenic themselves, the  fecal coliforms may indicate the
 presence of other pathogenic microorganisms.

      Total and fecal coliform measurements  in Grand Lake did not reveal
 significant bacteriological pollution during either the June or September
 sampling period.   The geometric average density  in June was two fecal  coli-
 forms per 100 ml  while in September the average was only one fecal coliform
 per 100 ml for all sampling locations in the lake.   The data did not reveal
measureable bacteriological contamination from residential septic tank
 systems  located along the shoreline of Grand Lake.

     Coliform measurements in  Shadow Mountain Lake averaged two to three
 times higher in June than in September with the greatest density occurring
near the westshore marina at Station 32 (87 total and 26 fecal  coliform  per
 100 ml).   The North Fork Colorado River enters the lake near this sample
site and the data shows  that higher coliform density in the river in  June
probably contributed to  the higher densities measured at Station  32.   The
                                  34

-------
north end of Shadow Mountain Lake is impacted by two discharges from highly
developed residential and recreational areas - Little Columbine Creek, which
drains the Columbine Lake area, and the Grand Lake Wastewater Treatment Plant
serving Grand Lake Village.  In June fecal coliform densities of nearly 3,000
per 100 ml were observed on two out of three sampling days in Little Columbine
Creek, while in September, fecal coliform densities average less than 100
per 100 ml.  The Grand Lake Wastewater Treatment Plant effluent intermittently
contained concentrations of extremely high fecal coliform counts (approxi-
mately 500,000 per 100 ml) during both the June and September sampling periods.
The chlorine residual in the effluent was zero on two out of six sampling
days, and this inadequate disinfection likely resulted in the high fecal
coliform counts.  When a chlorine residual was present the fecal coliform
density dropped to approximately 20 per 100 ml.  The combined impact of
these two discharges to the north end of Shadow Mountain Lake was revealed
in total and fecal coliform densities approximately three times higher there
than in the remainder of the lake.

     Coliform measurements in Lake Granby indicated no significant bacteriological
pollution present during either the June or September studies.  Most sampling
sites showed slightly higher coliform densities in June than in September,
but only one out of nineteen stations showed a geometric mean fecal coliform
density greater than five per 100 ml.  Two of the six tributaries to Lake
Granby contributed significant numbers of coliforms during both June and
September.  Stillwater Creek contributed an average of 385 fecal coliforms
per 100 ml in June while Soda Creek averaged 75 fecal coliforms per TOO ml.
In September these fecal coliforms densities had decreased by approximately
one half.  These two streams, along with six other sampling sites, were
selected for additional microbiological testing, as discussed in the following
section.

     Fecal Streptococcus Data

     In order to gain a better understanding of the various types and origins
of fecal organisms present in the Three Lakes and their tributaries, eight
different sampling sites were sampled during June and September for fecal
streptococcus typing.  This work involves growing selected fecal coliform
organisms under specific growth conditions such that the various survival
and die off patterns indicate which specific bio-types and strains of the
fecal streptococcus group are present.  From this identification of specific
strains it is then possible to deduce the most likely sources of the fecal
streptococcus contamination.  The occurrence of fecal streptoccous organisms
in water suggests fecal contamination, while their absence indicates little
or no warm-blooded animal contamination (Geldreich, 1966).

     The fecal streptococcus group consists of many strains and bio-types
having specific origins and diverse survival rates.  Two of the more
important host-specific streptococcus bio-types are the S. bovis-equinis
                                   35

-------
and the S. fecal is var.  The S. Bovis-equinis indicator organisms are
subject to rapid die off outside the animal intestinal tract (Mundt, 1963),
so that their presence in water or soil indicates recent animal contamination.
The S. fecal is var. strain of fecal streptococcus organisms are predominantly
human types.

     There are two other fecal streptococcus bio-types which have somewhat
limited sanitary significance.  The ubiquitous S. fecal is var. liquefaciens
may represent a substantial portion of any fecal streptococcus population
in natural waters.  These organisms are quite persistent and may continue to
survive in soil, irrigation water, cold waters (<12 C), and other natural
waters for extended periods of time.  They are occasionally found in soil
and water from remote areas, and these infrequent occurrences may be
related to direct wildlife contamination or, occasionally, to surface run-
off from snowmelt and rainfall (Van Donsel, et al, 1967).

     The other fecal streptococcus bio-type having limited sanitary signi-
ficance is the S. fecal is atypical strain which is found in substantial
numbers in rotting vegetation (Geldreich, et al, 1964, and Langston and
Bouma, 1960) and in cannery wastes (Geldreich and Kenner, 1969), but occurs
only rarely in thh feces of warm-blooded animals.

     Fecal streptococcus typing was performed on water samples collected in
June and September from two lake stations, five stream stations, and one
wastewater treatment plant effluent (Table 19 and 20).  Human types of
fecal streptococcus ( S. fecal is var.) predominated in samples collected
during both June and September near the Shadow Mountain Lake boat dock areas
(Stations 35 and 39), the Grand Lake Wastewater Treatment Plant effluent, and
Stillwater and Little Columbine Creeks near their confluence with Lake Granby
and Shadow Mountain Lake, respectively.  During September, Soda Creek also
contained a preponderance of human types of fecal streptococcus.  These
results suggest that the Shadow Mountain Lake boat dock areas, the Grand
Lake wastewater treatment plant effluent, and Little Columbine, Stillwater,
and Soda Creeks are all possible recipients of human fecal pollution and
warrant continued monitoring in the future.

     Water samples from the North Fork Colorado River station located near
Shadow Mountain Lake contained human, animal, and rotting-vegetation types
of fecal  streptococcus.  The samples showed no significant differences in the
percentages of types identified between the Spring and Fall studies.  These
findings  would be expected for the North Fork Colorado River which flows
through National Park forest and meadow lands, ranch pasture lands, and
mountain  home development areas.  The Colorado River flowing out of Lake
Granby (Station 58) did not contain fecal streptococcus types of sanitary
significance.
                                   36

-------
                                                                   TABLE 19
                                                              THREE LAKES STUDY

                                   FECAL STREPTOCOCCUS IDENTIFICATION - NUMBER OF STRAINS & PERCENT OF TOTAL
                                                                  JUNE, 1974
Station
Number    Location
S. fecalis   S. fecalls   S. bovis-    S.  fecalis    S.  fecalis
                                                                                                       Total No.
   var.1
biotypes    equinus***   atypical***   liquefaciens**   Strains  Picked
Comment
24

25

31


35
39

43

44

58
*S.
Stillwater Cr.

Soda Cr.

Colorado R.


Shadow Ht. Lake
Shadow Mt. Lake

Grand Lake STP

Lt. Columbine Cr.

Colorado R.
9

4

5


10
9

7

8


0

0

0


0
0

0

0


0

0

3


0
0

0

0


0

0

0


0
0

0

0


1

6

2


0
1

3

2

1
10

10

10


10
10

10

10

1
Human Types
Ubiquitous Types
Human Types
Ubiquitous Types
Human Types
Anfmal Types
Ubiquitous Types
Human Types
Human Types
Ubiquitous Types
Human Types
Ubiquitous Types
Human Types
Ubiquitous Types
Ubiquitous Types
90%
102
40*
60%
50%
301
203!
100%
9056
los;
70S
30s
SOS
20%
100?
fecalis var. are predominately human types.
b*S. fecalis var. liquefaciens are ubiauitous
'*$.
bovis-equinus and S. fecalis
biotypes are
(non-pollution) types.
predominately from animal
sources and S.
fecalis atypical
are
from rotting vegetation.


-------
                                 TABLE 20

                            THREE LAKES STUDY

FECAL STREPTOCOCCUS IDENTIFICATION - NUMBER OF STRAINS & PERCENT OF TOTAL
                             SEPTEMBER, 1974
Station
Number
24



25


31


35
39

43


44


58


*S.
**S.
***S.
s.
Location
Still water Cr.



Soda Cr.


Colorado R.


Shadow Mt. Lake
Shadow Mt. Lake

Grand Lake STP


Lt. Columbine Cr.


Colorado R.


fecalls S
var.*
22



18


2


4
13

47


21


2


fecal is var. are predominately human
recalls var. liquefaciens
. fecal is
biotypes
1



0


4


0
0

2


2


1


types.
S. bovis-
equinus***
1



2


0


0
0

0


0


0



S. fecal is
atypical***
1



3


2


0
4

2


15


15



S. fecal is
liquefaciens*''
1



0


0


0
0

0


0


0



Total No.
t Strains Picked
26



23


8


4
17

51


38


18




Comment .
Human Types
Animal Types
Vegetation Types
Ubiquitous Types
Human Types
Animal Types
Vegetation Types
Human Types
Animal Types
Vegetation Types
Human Types
Human Types
Vegetation Types
Human Types
Animal Types
Vegetation Types
Human Types
Animal Types
Vegetation Types
Human Types
Animal Types
Vegetation Types



84%
4%
4%
4%
78%
9%
13%
25%
50%
25%
100*
76%
24%
923!
4%
4%
55%
6%
15%
in
6%
83%

are ubiquitous (non-pollution) types.
bovis-equinus and S. fecal is biotypes
are predominately from animal sources
and S. fecal is
atypical are from
rotting vegetation.


-------
IV.  Biology

     Lake Stratification Measurements

     Temperature profiles at the various sampling stations on Grand  Lake,
Shadow Mountain Lake, and Lake Granby are shown in Figures 5 to 10.   The
gradients were established using a Yellow Springs tele-thermometer and
60 meter line with probe.  The profiles reported here are similar to and
well within the range of thermal conditions reported by Nelson (1971) for
1962-66.

     In general, Grand Lake and Lake Granby exhibited gradual, uniform
decreases in temperature during spring and early summer.  As the summer
progressed, the temperature profiles showed thermal stratification occurring,
with the depth and strength of the thermocoline increasing during the summer.
The shallow depth of Shadow Mountain Lake in conjunction with wind action
and the flow-thru characteristics of the lake generally precluded a  stable
thermal stratification.

     The dissolved oxygen concentrations and pH values obtained during  this
survey are shown in Tables 21 and 22.  Dissolved oxygen and pH values listed
at mid-depth and separated by a slash mark are values taken from above  and
below the thermocline, respectively.  The values listed for the two  major
surveys, June 7-19 and September 4-19, are average values for the three
day sampling period at each station.  Values for pH ranged from 6.3  to  8.5,
which is considered normal for water in the Three Lakes system.

     Dissolved oxygen concentrations reported here differ somewhat from
dissolved oxygen concentrations previously reported for mid- and maximum
depths.  The lowest dissolved oxygen concentrations observed during  this
survey were 4.0, 6.2, and 1.7 mg/1 for Lake Qranby, Shadow Mountain  Lake
and Grand Lake, respectively.  These values, except for Grand Lake (Station
50), are slightly higher than minimum values of 2.9 and 4.8 mg/1 reported by
Nelson  (1971) for Lake Granby and Shadow Mountain Lake, respectively, in
1963-66.  Nelson (1971) reported a minimum dissolved oxygen concentration
of 3.9 mg/1 for Grand Lake.

     From Table 22 it can be seen that in Lake Granby (Stations 5, 10, 14),
dissolved oxygen concentrations gradually declined in the hypolimnion
throughout the summer.  This same condition was also evident in Grand Lake
in the  lower levels of the hypolimnion as shown by the decrease in dissolved
oxygen concentrations from 6.0 mg/1 (Oune 7-19) to 2.8 mg/1  (Sept. 4-19).
Dissolved oxygen concentrations determined during the interim period did
not show the decreasing dissolved oxygen conditions.  This was likely due
to the difference in sampling depth, the interim sampling being done at a
maximum of 30 meters while sampling during the two major surveys was done
at 90 meters.  Station 50 in Grand Lake was the only sampling location  in
                                   39

-------
Legend for Temperature Profiles in  the  Three  Lakes
                (Figures 5 to 10)
                                      5/30/74
        	   6/28/74
        	   7/19/74



        	   9/4-19/74
                         40

-------
    0.—
/
                                                                            I   /
                                                                                '
                                                                                   X

   10
O
n>
•a
ft>
-5
IX)
   20
   30
                       •  •  *
                                                                     Temperature profile, Station  50,
                                                                     Grand Lake.
      _t_J	I—I	1—I—I	1—L
                                              Temperature in  °C

-------
           Figure   6.   Temperature profile.


                        Station 41, Shadow Mountain Lake
                                                 )
                                                                          ..

                                                                              OO        CTl

                                                                              ^        rv>
    10


     0
J	L
                           I   I  .  I  I  I	I	  	I	I	I	I	I	I—I—I—I—I—I—I—1—I—I—I
0
O>
T3
-J
I/)
    10

     0
                   Station 37, Shadow Mt. Lake
                                                    '  •'/
    10
                                                      1  /
                   Station 28, Shadow Mt.  Lake      j   //
                                                       ' '
                                                      10
                                               1 _ 1 _ L
                                                                    15
                                                                       1 - 1

                                               Temperature in °C

-------
CO
                                                               Figure   7.    Temperature  profile,  Station  5,
                                                                            Lake  Granby.
                                                  Temperature  in   C

-------
   0 i—

  10
—
I
T3
•—
 -
 ri
 I
 -
 l/i
   20
   30
      ]
1
1
i
>
i /
... -i
,.••
•
s\
1 1
\ / ': 1 >
,r i/
              Figure  8
Temperature profile, Station 8,

Lake Granby.
        10

Temperature in  C
                                                                              15
                                    J	I—L
                                                                                            '  '
                            To

-------
        Or—
       10
_-
 n
ro
-a
tt-
    n
    -j
       20
       30
               J	1	L_L
                                                              •
                                                                              /    l/j/
                                                                             /     i.-   !/
                                                                                      //

                                                      Figure  9.  Temperature profile, Station  10,

                                                                  Colorado  River Arm, Lake Granby.
                                                    10
                                                                                     _t	1—L
                                             Temperature in °C

-------
         Oi—
        10
---
a
     c
     n>
      T

      -.
         20
                                                                                          /
                                                                                   /
                                                  i

                                                              Figure  10.   Temperature profile,  Station 20,

                                                                          Lake  Granby.
         30
                                                   Temperature in °C

-------
                                               TABLE  21
                         pH VALUES  IN THE THREE LAKES AND THE  COLORADO  RIVER
        Location
                                 5/30
                                          6/7-19*
                          (Standard pH Units)

                        6/28      7/19
Colorado River (58)
    Downstream of
    Granby
7.6
7.5
7.5
                                             7.6
                                                                                          8/14
                                             7.9
                                                       9/4-19*
Lake Granby
Colorado River Arm (10)
surface
mid
bottom
Middle (14)
surface
mid
bottom
North (20)
surface
mid
bottom
Arapahoe Arm (5)
surface
mid
bottom
Shadow Mountain Lake
North (41)
surface
mid
bottom
Middle (37)
surface
mid
bottom
South (28)
surface
mid
bottom
Grand Lake
Middle (50)
surface
mid
bottom


7.5
7.4/7.3
7.3

7.7
7.5/7.4
7.3

7.8
.
7.5

7.5
7.4/7.3
7.3


7.9
_
_

7.2
7.2
7.3

7.4
7.6
7.3


7.6
7.2/7.1
7.2


7.7

7.4

8.2
7.8/-
7.7

8.1
7.8/-
7.7

7.9
1.91-
7.4


7.5
_
7.3

7.7
-
7.4

7.8
.
7.5


7.1
7.V-
7.0


7.8
7.3/7.5
7.5

8.3
8.4/7.4
7.1

8.2
8.4/7.8
6.9

8.4
7.8/7.8
7.0


8.0
_ _
- -

7.4
7.5
7.5

7.4
7.4
7.4


7.0
7.0/7.1
7.4


7.5
7.2/6.3
7.3

8.3
7.9/7.6
7.8

8.5

.

7.6
7.6/7.5
7.1


_
—
—

7.7
_
_

7.9
7.8
7.8


7.6
7.2/7.5
7.4
• T*- -__

7.3
7.0/6.8
7.6

7.1
7.0/6.7
7.2

8.3
-/7.8
7.8

7.0.
6.9/6.4
7.3


3.0

—

7.4

7.7

7.0

8.1


7.6
6.9/6.5
7.6


7.9

7.3

7.6
7.1/-
7.0

7.6

7.2

7.8
7.0/-
6.9


7.7



7.3

7.2

7.2

7.3


7.2
6.9/-
6.7
                                                                     7.1
*Geometric Mean Value for 3-day sampling period.
                                                   47

-------
                                                TABLE  22
                                    DISSOLVED OXYGEN  CONCENTRATIONS  IN
                                  THE  THREE  LAKES AND THE  COLORADO RIVER
                                                 Dissolved Oxygen  Concentration  (mg/1j
Location
Lake Granby
Colorado River Arm (10)
surface
mid
bottom
Middle (14)
surface
mid
bottom
North -(20)
surface
mid
bottom
Arapahoe Arm (5)
surface
mid
bottom
Shadow Mountain Lake
North (41)
surface
mid
bottom
Middle (37)
surface
mid
bottom
South (28)
surface
mid
bottom
Grand Lake
Middle (50)
surface
mid
bottom
5/30


8.1
8.3/8.1
7.9

9.0
9.0/8.7
8.7

9.3
-
9.0

7.9
9.0/8.9
8.4


8.2
-
_

8.1
8.1
8.1

8.1
8.1
8.0


8.3
8.3/7.9
7.7
6/7-19*


8.6
-
7.7

9.1
8.87-
7.6

9.0
8.37-
8.3

9.1
9.17-
7.9


8.5
.
8.8

8.4
.
8.2

8.4
.
7.3


9.1
8.67-
6.0
6/28


7.9
7.8/7.9
6.8

8.3
7.9/7.4
7.1

7.9
7.9/7.9
6.9

7.2
7.9/7.9
7.9


7.5
_
_

7.9
7.9
7.5

7.5
7.3
7.4


8.1
8.6/8.6
7.3
7/19


8.1
6.4/6.1
6.1

7.9
6.7/6.6
6.4

7.6
6.6/5.9
6.1

7.7
7.3/6.5
7.3


7.3
-
_

7.4
7.4
6.3

7.3
7.7
6.9


7.9
7.9/8.1
7.2
8/1


7.5
7.2/6.3
5.1

7.1
6.8/5.8
6.2

6.5
-
'

7.2
5.5/7.2
6.1


-
_
.

8.0
-
_

8.2
a. 3
7.4


8.3
7.5/7.4
7.2
8/14


7.1
7.0/6.1
5.3

7.2
7.0/6.0
5.6

7.1
-/7.0
6.5

7.4
7.0/5.4
5.6


-
-
_

7.6
_ •
8.0

7.4
•-••
7.0


8.1
7.6/7.4
7.3
9/4-19*


7.9
-
4.7

7.6
6.0/-
5.0

7.8
-
7.3

7.8
5.7/-
4.8


8.0
.
_

7.9
-
8.1

6.6

6.4


8.2
6.9/-
2.8
Colorado River (58)
    Downstream of
    Granby
9.2
9.2
7.7
10.0
9.2
9.1
9.1
*Mean value for 3-day sampling period.
                                                   48

-------
the main body of any of the Three Lakes  which  exhibited  extremely  low
dissolved oxygen concentrations in the hypolimnion.

     In summary, dissolved oxygen concentrations  reported  here  are
generally slightly higher than those previously reported.   However, there
is insufficient data available to conclude that dissolved  oxygen conditions
in the Three Lakes have either improved  or deteriorated  since the  earlier
studies.

     Primary Productivity

     A study of the primary productivity rates in the Three Lakes  was  con-
ducted in order to gain an insight into  the present  trophic status  of  the
lakes and to compare existing rates with those previously  reported.  Primary
productivity, as measured by the C14 method, gives an indication of the  rates
of carbon fixation by the primary producers.  The C14 methodology  is pre-
sently one of the best assessments of the effect of  interactions of the
physical, chemical, and biological factors which determine the  actual  fertil-
ity of any environment (Goldman, 1961).

     Primary productivity studies were conducted on  September  9,  10, 11, and
13, 1974, at a total of 14 stations.  Water samples  were collected with  a
Van Doren water sampler, placed in 300 ml light and  dark bottles  and inoc-
ulated with 1 ml of NaHC03 solution containing 4.4 yd' of C1^  per  ml.  All  samples
were then re-suspended at the depth from which they  were collected. At
the end of a six hour period, the samples were retrieved,  filtered through
0.45y membrane filters and placed in a dessicator to await analysis at the
EPA, Region VIII chemistry laboratory in Denver, Colorado.  Prior to analysis
each filter was placed in a counting vial and dissolved with 1.5  ml Diethyl
Formamide.  The counting vials were then filled with Cab-0-Sil  plus 15 ml
of toluene base scintillation solution.   Each dissolved sample was then
counted in a liquid scintillation counter.

     Light penetration into the lake waters was measured with  a submarine
photometer and secchi disk.  Incident light measurements were  made with  a
Belfast recording pyrheliometer equipped with a 24-hour chart  drive.   The
recorder was started before sunrise and allowed to run until after sunset.
Alkalinity measurements were obtained at each sample location  for use  in
computing total C values at the time of C14 primary productivity  studies.

     During this study, productivity rates for the Three Lakes were typical
of mesotrophic to eutrophic waters (Committee on Water Quality Criteria,
1972).  Primary productivity rates per m2 for Grand Lake, Shadow  Mountain
Lake, and Lake Granby are listed in Table 23.  Page  78 in  Appendix A lists
productivity rates in m3 at selected depths. ,Values ranged from  8.1 mg
C/m2/hr in Granby (Station 23) to 32.8 mg C/mVhr in Grand Lake (Station 54).
Essentially all of the primary productivity occurred in the upper six  meters
of the water column, a condition similar to that reported by Nelson (1971).
                                   49

-------
                TABLE 23
     PRIMARY PRODUCTIVITY RATES  AND
ILLUMINATION DEPTHS FOR THE THREE  LAKES
    Lake
  Date
Granby
9/13/74
9/11/74
Shadow Mtn.
9/ 9/74
Grand
9/10/74
Station

   2
   5
   8
  10

  14
  16
  20
  23
  28
  33
  37
  47
  50
  54
  Primary
Productivity
  mgC/m^/hr

       18.0
       16.0
       19.2
       22.7

       20.8
       18.9
       16.0
        8.1
 Avg.   17.5
              Avg.
       15.5
       20.0
       20.4
       18.6

       15.3
       20.5
       32.8
 Avg.   22.9
                                              Illumination Depth
                                              _ (meters ) _

                                                    4.8
                                                    5.0
                                                    5.5
                                                    5,2

                                                    5.0
                                                    4.8
                                                    4.6
                                                    4.0
                                                    4.9

                                                    4.8
                                                    4,0
                                                    4.0
                                                    4.3

                                                    4.6
                                                    5.5
                                                    5.5
                                                    5.2
                    50

-------
      Lake
  Granby
  Shadow Mtn.
  Grand Lake
                                    Table 24

                   Previously Reported Productivity Rates*

                       Comoared to Present (1974) Rates
   Date
 7/31/63*
 7/28/64l
 7/30/651
9/(ll-13)/74z

 7/30/63
 7/29/64
 7/29/65
 9/9/74

 7/30/63
 7/29/64
 7/29/65
 9/10/74
  Primary
Productivity
 mqC/nr/hr.

    39.0
    40.0
    14.0
    17.5

    51.0
    52.0
    24.0
    18.6

    43.0
    31.0
    12.0
    22.9
 Illumination
Depth (meters)

      4.8
      6.1
      5.8
      4.9

      3.9
      4.2
      4.4
      4.3

      4.0
      5.0
      7.2
      5.2
* productivity rates as reported by Nelson (1971)


1 Nelson (1971)

2 EPA  (1974)
                                       51

-------
      The  primary  productivity rates presented here are similar to those
 reported  by  Nelson  (1971) for July 1965, but are markedly lower than his
 values  for 1963-64  (Table 24).   It is important to recognize that the values
 shown as  "previously reported productivity rates" should not be taken as
 absolute  values of  primary productivity for each lake in question.  All of
 the  reported values are from very limited sampling periods and may reflect
 either  maximum, minimum, or mean primary productivity rates for the summer
 months.   The primary productivity rates, however, do reflect the level of
 productivity at a given point in time and, when used in conjunction with
 other data (i.e. algal counts),  can give useful insight into the present
 trophic status of the Three Lakes.

      Aquatic Plant Survey

      The  presence of large quantities of aquatic plants in Shadow Mountain
 Lake  has  been documented in previous studies of the Three Lakes area (EPA,
 1970; Kugrens and Paulsen, 1971).  Extensive growths of aquatic plants,
 primarily El odea sp>. have physically inhibited boating and fishing in
 Shadow Mountain Lake and created objectionable odors during decay.  Although
 a complete investigation of the aquatic plant growths was beyond the scope
 of this study, limited sampling was conducted at three different times during
 the summer of 1974 to determine the relative increase in growth.

      At each sampling station, an average of three samples of aquatic plants
 were  collected along transects extending from the shoreline out to the
 4.6 m (15 ft) depth.  Samples were collected using a Petersen dredge.
 Figures 11-13 show the relative  increase in abundance during the summer.  The
 general terms - sparse, moderate, and abundant - indicate the relative amounts
 of aquatic plants collected at each location.

      Phytoplankton Survey

      In order to determine the kinds and relative abundance of indigenous
 algal species in the Three Lakes, water samples for plankton analysis.vwere
 collected seven times during the period from May to September 1974.  Eight
 stations were sampled during each of the sampling periods.

      Sampling station locations and dates of sampling are noted in Tables
 25-32.  All   samples were collected at a depth of one meter, immediately pre-
 served with  5# formalin, and stored in the dark until analysis.  Prior to
 analysis, 50 ml of sample were allowed to settle for 2-3 days, after which
 a 10 ml  aliquot was used for analysis.  A portion of the aliquot was placed
 in a Sedgewick-Rafter cell  and two strips counted for each sample, algal cell
 concentrations being reported as cells per milliliter.   Filamentous or
 colonial algae were counted as a single unit rather than as individual cells.
Results of the algal counts are shown in Tables 25-32.   An V indicates
that the algal species was  observed while scanning the  sample but was not
observed during the acutal  strip counts.
                                   52

-------
       SPARSE





      H MODERATE





        ABUNDANT
NORTH FORK
COLORADO

 RIVER
         GRANBY
           f • •  •
           . —



         PUMP CANAL
                                                       I km
COLORADO


   RIVER
 Figure 11. Aquatic Plant Sarvey, Shadow Mountain Lake, June  16, 197*+,
                             53

-------
        SPARSE

        MODERATE

        ABUNDANT
                                    COLORADO
                                       RIVER
NORTH FORK
     	>
COLORADO
 RIVER
        GRANBY
               .-
           ,. -
        PUMP CANAL



Figure 12. Aquatic Plant  Survey, Shadow Mountain Lake, July  17, 197*4.
                            54

-------
     1 SPARSE
        MODERATE
        ABUNDANT
                                    COLORADO


                                       RIVER
NORTH FORK
COLORADO

 RIVER
        GRANBY
          ^ •  —•
              —



        PUMP CANAL











Figure 13. Aquatic Plant  Survey, Shadow Mountain Lake, September 17, 197*+,





                           55

-------
                               TABLE  25


       PHYTOPLANKTON DATA FROM GRAND  LAKE  -  MIDDLE  (STATION  50)


                         5/30     6/1.5    6/28    7/19     8/1    8/14    9/9

Baclllariophyta
  Gomphonema sp.           18       8
  Diatoma sp.               8       16       8
  Fragilaria sp.            88                     8     16      x
  Melosira sp.             48       56     24      40      x     16      x
  Navicula sp.              8              16
  Cocconeis sp.           16                                             8
  Stephanodiscus  sp.     192              56                    64
  Eunotla sp.                                8
  NltzscMa sp.                    72              16      x      x      8
  Asterionella  sp.                                  48      72     48     64
  Cyclotella sp.                                     8                    16
  Gyros1gma sp.                                                   x
  Pinnularia sp.                    x
  Rholcospenia  sp.                  16
  Unident. pennate         32	

      Total cells/ml     330      176     112    150      80    144     96

Cyanophyta
  Anacystls sp.           32                        8              8      x
  Anabaena sp.                      x                     8             x
  Lyngbya sp.            	40	

      Total cells/ml      32              40       8      8      8

Chlorophyta
  Schroderia sp.                    8              16      56            24
  Volvullna sp.                    x               8x8
  Dlctyosphaerium sp.                                      8      8     32
  Charadum sp.                                           8
  Closterlum sp.                                                   8
  CosmaMum sp.                                                   8     16
  Scenedesmus  sp.                                                 *
  Single cell  flag.
    green                                 40      56
    colonial green                         32
  Volvox sp.                                        8
  Oocystls sp.                                                            x
  Spondyloslum sp.                                                        x

      Total cells/ml               8     72      88      72     32     88

Chrysophyta
  Dlnobryon sp.          	8      16      24      x	

      Total cells/ml                        8      16      24      x


                         362      184     232    262     184    184     184
                                     56

-------
                               TABLE  26
            PHYTOPLANKTON  DATA  FROM SHADOW MOUNTAIN LAKE
                        NORTH END (STATION 41)


                          5/30      6/15    6/28    7/19    8/1*    8/14    9/9*

Badllariophyta
  Stephanodlscus sp.       260       40              40              x
  Meloslra sp.            192      176              16             56
  Asterione11 a sp.         48       64       56       8             72
  Synedra sp.              80        8                              8
  Diatoraa sp.              16        8
  Navlcula sp.             40               32                      x
  TabellaHa sp.           12                       8              8
  Nitzschia sp.            72      384     112       8             96
  Cocconels sp.            12        x        8                     16
  FragilaHa sp.           20                      16             96
  Cymbella sp.              4       40               8
  Gomphonema sp.            4
  Plnnularia sp.                     x               8              x
  Caloneis sp.                       88                     32
  Amphora sp.                                       x
  Ep1them1a sp.                                                    x
  Cyclotella sp.         	8	

      Total cells/ml       760      528     208     112            392

Cyanophyta
  Anacystis sp.            44        x               3
  Oscillator la sp.          4                6
  Anabaena sp.              4        x                              8
  Lyngbya sp.                       32       32

      Total cells/ml        52       32       32       B              3


Chlcrophyta
  Scenedesmus sp.           8                                      x
  Trachelomonas sp.        16
  Closterlum sp.           40               32
  Cosmarium sp.             4
  Dlctyosphaerlum sp.                        8
  Volvulina sp.                                     8
  Schroderia sp.                                    8              x
  ElaktothHx sp.                                                 24
  Anklstrodesmus sp.                                                x
  Unldent. single cell     36                8
  Unident. single cell
    flag.                  12              120      128

      Total cells/ml       116              168      144             24

Chrysophyta
  Oinobryon sp.            48	x	40	8	

      Total cells/ml        48               40       8

      Grand Total
        cells/ml          976      560      448      272             424
*No sample taken.

                                  57

-------
                                TABLE 27


             PHYTOPLANKTON DATA FROM SHADOW MOUNTAIN LAKE
                        MIDDLE (STATION 37)


                         5/30     6/15    6/28    7/19    8/l_    8/U    9/9.

Bacillariophyta
  Stephanodiscus sp.     248       96      64       8     40      24     40
  Meloslra sp.           232      280     200      88      8      24     40
  Synedra sp.            104       16      48      16
  Navlcula sp.            88               40      16                    16
  Cocconeis sp.           48        8       8                            24
  Asterionella sp.        96       40      16             40      32     72
  Nltzschia sp.           72      200     104     200     24             16
  FragilaHa sp.          16        8      16       8     16              8
  Diatoma sp.              8                       48      8      24
  Cymbella sp.             8                        8
  Caloneis sp.            16        888
  Closterium sp.                           24
  Gomphonema sp.                    x              32
  Cyclotella sp.                   16                      8       x     40
  Plnnularia sp.                    x
  Tabellaria sp.                                                   x
  Diatoma sp.                                                             8

      Total cells/ml     936      672     528     432    144     104    232


Cyanophyta
  Anacystls sp.           40
  Anabaena sp.             8                             104
  Lyngbya sp.                      48      40
  Oscillatoria sp.                          x       8

      Total cells/ml      48       48      40       8     104

Chlorophyta
  Volvulina sp.                     x                              x
  Scenedesmus sp.                                   8      8       x      x
  Dlctyosphaerlum sp.                               8      8
  SchrodeHa sp.                                          16       x     24
  Elaktothrix sp.                                                  8
  Single cell                               8
  Unident. colonial       24
  Spondyloslum sp.                                                         8
  Mlcractlnlum sp.                                                       16

      Total cells/ml      24                8      16     32       8     48

Chrysophyta
  Dlnobryon sp.           40	8      16     32	8	

      Total cells/ml      40               8       16     32       8

      Grand Total
        cells/ml        1048      720     584     472    312     120    360
                                   58

-------
                                TABLE  28
             PHYTOPLANKTON  DATA FROM SHADOW  MOUNTAIN IAKE
                        SOUTH END (STATION 28)


                         5/30     6/15    6/28    7/19   8/1    8/14    9/9

Bacillarlophyta
  Meloslra sp.           216      152     64                     40     32
  Stephanodlscus sp.      176       88     40                     16     48
  Mavicula sp.            36       16     32              x      8      8
  Asterionella sp.         40       16     16       24    160     16     48
  Stauroneis sp.          12
  Cymbella sp.             4       24              x
  Synedra sp.            144       16       8                      8
  Frag11ar1a sp.          56       16                     x      x      x
  Nltzschia sp.           28      184     96              8     56     48
  Gomphonema               8
  Tabellaria sp           32                                      8
  Cocconeis sp.            8       24       8                      8
  Pinnularia sp.                    8
  Caloneis sp.                     16     24                      x
  Dlatoma sp.                       8                     x
  Cyclotella sp.        	24      x	8_

      Total cells/ml      760      568     288       48    160    160     192

Cyanophyta
  Anacystls sp.           32       16
  Anabaena sp.                     24              16      24             8
  Lyngbya                          48       8                             x

      Total cells/ml       32       88       8       16      24             8


Chlorophyta
  ClosteHum sp.          56        x      24
  Trachelotnonas sp.       12
  Selenastrum sp.          4
  Pedlastrum sp.           8
  Scenedesmus sp.          4                                             x
  SchrodeHa sp.                                   16       x             24
  Spondylosium sp.                                   x                     8
  Elaktothrlx sp.                                                 x
  Unldent, unlcell
    flag.                 24              136             320
  Unlcell w/ seate        12
  Dlctosphaerlum sp.                                                      x
  Volvullna sp.                                                          x
  Phacus sp.                                                             x

      Total cells/ml      120              160       16    320             32


Chrysophyta
  Dlnobryon sp.           96       16      24

      Total Cells/ml       96       16      24

      Grand Total
        cells/ml        1008      672     480       80    504    160     232
                                   59

-------
                TABLE 29
PHYTOPLANKTON DATA FROM LAKE GRANBY
      ARAPAHOE ARM (STATION 5)
         5/30     6/15    6/28    7/19    8/1     8/U   9/9
Bacillanophyta
Stephanodiscus sp. 240
Asterionella sp. 16
Synedra sp. 16
Meloslra sp. 16
Navicula sp. 32
Fragilaria sp.
Oiatama sp.
Nitzschla sp.
label! aria sp.
Cocconefs sp.
Cyclotella sp.
Total cells/ml 320
Cyanophyta
Anacystis sp. 192
Lyngbya sp.
Anabaena sp.
Unident. colonial
Total cells/ml 192
Chtcrophyta
Spondyloslum sp.
Volvulina sp.
Eudorlna sp.
D1ctyosphaer1um sp.
Cosmarium sp.
Schroderia sp.
Pediastrum sp.
Oocystis sp.
Total cells/ml
Chrysophyta
Dinobryon sp.
Total cells/ml
Grand Total
cells/ml 512

X
32

24
8
X
X
96
B


166


24
X

24











16
16

208

8
X

8
16


40



72

168
X

40
208

X









X


230

16
232








e
256

16



15


8
8
8




32

16
16

320

8
16

8

80





112

8



3


16


16
56


88

16
16

224


16



48



8

72

8

8

16


X

X
16



16

X


104




16



24


16
56

8

X

a


8

X
X

X
X
3




72
                   60

-------
                TABLE 30
PHYTOPLANKTON DATA FROM LAKE GRANBY
        MIDDLE (STATION 14)
         5/30     6/15    6/28    7/19    8/1    8/14    9/9
Bacillariophyta
Stephanodiscus sp. 96
Meloslra sp. 128
Synedra sp.
Navlcula sp.
Nitzschia sp.
Diatoma sp.
Tabellaria sp.
AsteHonella sp.
FragllaMa sp.
Cyclotella sp.
Cymbella sp.
Cocconels sp.
Amphora sp.
Total cells/ml 224
Cyanophyta
Anacystis sp. 144
Lyngbya sp.
Anabaena sp.
Unident. colonial
Total cells/ml 144
Chlorophyta
Ankistrodesmus sp. 16
CosmaHum sp. 16
Volvox sp. x
Dlctyosphaerlutn sp.
Volvullna sp.
PandoMna sp.
Starastrum sp.
Schroderia sp.
Elaktothrix sp.
Golenklnla sp.
Phacus sp.
Trachelomonas sp.
Total cells/ml 32
Chrysophyta
Dlnobryon sp.
Total cells/ml
Grand Total
cells/ml 400

X
16
16
16
184
16
32
32


24

X
312


32


32















48
48

392


48
8
32
112
X
8
16
X
8



232

496
8

64
568




X
8







8

16
16

824

8






96
8
8



120

40



40


16

8
8







32




192





X



80

16


96

8

8

16


32

16
8
8
X
16
X



80

8
8

200

32
8


16



16
16 16

8 x

40 72

2 24

x x

2 24


8 X

8
X X

8 8
x

X
X
X
16 16




58 112
                  61

-------
                                TABLE 31


                PHYTOPLANKTON DATA FROM LAKE GRANBY
                  COLORADO RIVER ARM (STATION 10)


                         5/30     6/15    6/28    7/19    8^    8/14    9/9

Baclllarlophyta
   Stephanodiscus sp.     132       72      24       8      8      24      x
   Melosira sp.           160      256      56                            88
   Frag1lar1a sp.          12       32       x             80      16     16
   Synedra sp.            104        8      16
   Tabellaria sp.           8        8
   Nltzschla sp.           16      432      64              8
   Cymbella sp.             8
   Gomphonema sp.           4        8       8
   Navicula sp.            20               16              8              x
   AsteHonella sp.         8       48      32     112     32
   Amphora sp.                      16                              x
   Plnnularia sp.                    x
   Dlatoma sp.                               8
   Actinella sp.                             x
   Cyclotella sp.                                                   8      8
   Cocconeis sp.                                                           x

      Total  cells/ml     472      880     288     120    136      48    112


Cyanophyta
   Anacystis sp.          144               48      32             16      8
   Lyngbya sp.                     136      24
   Anabaena sp.                                                     x      x
   Unldent. colonial                         32                     16

      Total  cells/ml     144      136     104      32             32      8


Chlorophyta
   Cosmarium sp.            4                              24             16
   Scenedesmus sp.                    x
   Closterlum sp.                            8
   Olctyosphearlum sp.                               8              8     32
   Volvullna sp.                                            8
   Schroderla sp.                                           8       x      x
   Pediastrum sp.                                           8
  Elaktothrlx sp.                                           x
  Spondylosium sp.                                                  x      x
  PandoMna  sp.                                                    x
  Oocystls sp.                                                      x
  Unldent. flag.          36

      Total  cells/ml      40                8       8     56       8     48


Chrysophyta
  Dlnobryon  sp.                    48      32

      Total  cells/ml               48      32


      Grand  Total
        cells/ml          656     1064     432     160    192      88    168
                                  62

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                          TABLE  32


          PHYTOPLANKTON DATA FROM LAKE  GRANBY
                  NORTH END (STATION  20)

                   5/30     6/15   6/28     7/19     8£L    8/14    9/9.
Bacillariophyta
Stephanodlscus sp. 64
Melosira sp. 48
Asterlonella sp. 43
Navlcula sp. 32
Fragilarla sp. x
Cy do tell a sp.
Nltzshlca sp.
Cymbella sp.
Synedra sp.
Pinnularla sp.
Calonels sp.
Cocconeis sp.
Gomphonema sp.
Actinella sp.
Ofatoma sp.
Total eel Is/ ml 192
Cyanophyta
Anacystls sp. 160
Lyngbya sp.
Anabaena sp.

X
144
16
3
X
24
208
24
8
3
8




448


32
X

8
8
X
24


24




16
X
X

80

224



8 8
8
200 16 8

x 8 40
88 16
8 40 16

x





X
304 72 88

48

8


x

X

40
8




16



64




Total cells/ml     160       32     224      48
Chi orophyta
Volvox sp. x
Spirulina sp.
Dlctyosphaerium sp.
Volvullna sp.
CosmaHum sp.
Schroder! a sp.
Micractinlum sp.
Single cell
Unfdent. single
cell flag.
Total cells/ml
Chrysophyta
Dlnobryon sp.
Total cells/ml
Grand Total
cells/ml 352
x
43
8
24
3
8
8
16 48 40
8 8
8 8
488 328 400 120
x
x
B
x
8
96 64
                              63

-------
      The algal data presented show relatively low total cell counts for
 each  lake with the highest counts observed during the spring and early
 summer  and  the lowest counts noted in the late summer and fall.  Grand
 Lake  consistently exhibited the lowest cell counts, while Shadow Mountain
 Lake  exhibited the highest.  The higher algal counts noted during the spring
 and early summer were due to increases in diatoms.  With increasing water
 temperatures, diatom concentrations gradually decreased while green algal
 concentrations increased.  Although green algal concentrations gradually
 increased during the summer, cell counts of green algae were consistently
 low and represented only a small percentage of the total cell count.

      Bluegreen algae were generally found in low concentrations thoughout
 the entire  duration of the study.  Station 14 in Granby Lake, however, had
 a maximum bluegreen algal count of 568 cells/ml on 6/28/76.  The major
 bluegreen algal specie observed during the study was Anacystis sp., while
 Anabena sp. and Lyngbya sp. were periodically reported.  In contrast to pre-
 vious reports (Prescott, 1955; EPA, 1970j Kugrens and Paul sen, 1972),
 Aphanizomenon sp. was not observed at any time during the study period.
 Aphanizomenon sp. had been reported in high concentrations.

      Due to differences in time of sampling, sampling location, and sampling
 methods, comparison of the results from this survey with previously reported
 data  is possible only on a generalized basis.  The algal data reported here
 are similar to some previously reported values but markedly different from
 others.  The spring and early summer algal counts from this survey were
 markedly higher than values reported by EPA (1970) and Kugrens and Paulsen
 (1972)  but  lower than values reported by Pennak (1955) for the same time of
 year  sampling period.  Algal counts from the mid-summer and fall sampling
 period  were only slightly higher than corresponding values reported by EPA
 (1970)  and  Kugrens and Paulsen (1972).  Additionally, the present study
 found consistently lower algal counts in Grand Lake than were previously
 reported by Prescott (1955).

     Although only a limited number of phytoplankton samples were collected
 during  this study, the data obtained is felt to be representative of the
 pelagic phytoplankton populations in the Three Lakes at the time of sampling,
 When compared with data from previous reports, the algal data presented
 here, aside from the lack of Aphanizomenon sp., do not show either marked
 increases in total cell count or shifts in the species composition.

     Algal  Growth Potential  of the Three Lakes - A Laboratory Study

     In order to investigate the possibility of accelerated eutrophication
and assess  the impact of nutrient loading on the productivity of Grand
Lake, Shadow Mountain Lake,  and Lake Granby, algal assays were initiated
to determine the algal  growth potential at present nutrient levels in the
Three Lakes.  An additional  algal  assay was conducted on the Colorado River
at the outlet of Lake Granby to determine the algal  growth potential of
water leaving the Three Lakes system.
                                   64

-------
     Methods

     Water was collected from one station on Grand Lake (50),  Shadow
Mountain Lake (37), and Lake Granby (14) and from the Colorado River below
Lake Granby on May 30, 1974.  All water samples were collected approximately
one meter below the surface and placed in plastic "cubi-containers".  Water
samples for nutrient analysis were also collected at the same  time and were
immediately preserved with 4 ml HgCl2/liter.  All samples were refrigerated
during transportation to the laboratory.  The algal  assay test water was
filtered through a 0.45y membrane filter and then frozen until each assay
was conducted.  Results of the nutrient analyses are shown in  Table 33-37.

     Periodically, throughout the summer months, nutrient samples were
collected at selected sampling points in the Three Lakes and the Colorado
River.  Although the sampling was not as frequent, and the stations sampled
not as numerous as desired for a comprehensive comparison of the Three Lakes,
it was felt that periodic sampling would give a generalized insight into
possible nutrient stratification and cycling within each of the bodies of
water.  As discussed earlier, dissolved oxygen, temperature, and pH were
also measured during each sampling period.

     All algal assays were conducted following the procedures  outlined in
Algal Assay Procedure, Bottle Test (EPA, 1971).  Selenastrum capricornutum
Printz was used as the test alga.  Assays were conducted in 250 ml wide mouth
Erlenmeyer flasks, each flask containing 100. ml total volume of culture
with four replicates per test concentration.  Test cultures were inoculated
from two week old stock cultures.  All flasks were incubated for seven days
in a constant temperature water bath at 24 ± 0.5°C. Compressed air was bubbled
through each culture at a rate of 500 ml per minute to maintain a pH of
8.5 or less and prevent possible carbon limitation.  All flasks were illumin-
ated with cool-white fluroescent lighting of 400 ft-c (4303 lux).

     Additions to the lake water of phosphorus (as I^HPtty) and nitrogen
(as Na2N03) were made singly or in combination of the two nutrients at con-
centrations (mg/1) of:  0.005 P, 0.01 P, 0.05 P, 0.01 N, 0.05 N, 0.1 N,
0.005 P + 0.01 N, 0.005 P + 0.05 N, 0.005 P + 0.1 N, 0.01 P + 0.01 N,
0.01 P + 0.05 N, 0.01 P + 0.1 N, 0.05 P + 0.01 N, 0.05 P + 0.05 N, 0.05 P +
0.1 N.  Water from each station, inoculated with the test algae but no
nutrients, was used as each respective control.

     Algal growth was monitored using a Turner Model 111 Fluorometer to
determine the chlorophyll a_ concentrations following each day of incubation.
The fluorometer was calibrated for chlorophyll analysis using the methods
outlined by Strickland and Parsons (1968).  Fluorometric readings were then
converted to dry weights using conversion factors established for water from
each sampling location.

     Figure 14 illustrates the growth responses of S. capricornutum to
nutrient addition to the water taken from Grand Lake, Shadow Mountain, Lake
Granby, and the Colorado River, the outflow of Lake Granby.  Results from
the four algal assays are expressed as maximum standing crop in mg dry

                                   65

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                                                TABLE 33
              CONCENTRATION OF AMMONIA NITROGEN IN THE THREE LAKES AND THE COLORADO RIVER
         Location	           5/30      6/7-19        6/28      7/19       8/1          8/14      9/4-19
Lake Granby
Colorado River Arm (10)
surface
mid
bottom
Middle (14)
surface
mid
bottom
North (20)
surface
mid
bottom
Arapahoe Arm (5)
surface
mid
bottom
Shadow Mountain Lake
North (41)
surface
mid
bottom
Middle (37)
surface
mid
bottom
South (28)
surface
mid
bottom
Grand Lake
Middle (50)
surface
mid
bottom


0.007
0.013
0.014

0.005
0.007
0.013

0.008
-
0.006

0.002
0.007
0.013


0.011
.
-

0.007
_
0.004

0.005
-
0.005


0.006
0.006
0.018


<0.003
-
0.023

0.002
O.002
0.015

<0.002
<0.002
0.006

<0.002
-
0.002


<0.002
_
<0.002

<0.002
_
<0.002

<0.002
-
0.004


O.002
0.002
0.018


0.009
0.009
0.023

0.026
0.011
0.029

0.006
0.005
0.009

0.004
0.004
0.030


0.008
_
_

0.020
_
0.009

0.008
-
0.008


0.009
0.008
0.011


0.013
0.006
0.005

0.077
0.010
0.025

0.016
0.022
0.011

0.012
0.009
0.007


0.008
_
_

0.005
„,
0.008

0.008
_
0.026


0.014
0.013
0.006


0.012
0.010
0.001

0.005
0.010
0.009

0.006
_
_

0.004
0.005
0.007


.
_
_

0.001
—
.

0.001
_
0.001


0.001
0.003
0.004


0.001
0.007
0.008

0.003
0.006
0.001

0.005
0.003
0.016

0.012
0.009
0.012


0.006
_
.

0.005
_
0.010

0.006
_
0.013


0.011
0.011
0.004


0.009

0.015

0.017
0.018
0.022

0.018
_
0.018

0.008
0.016
0.019


0.028
—
_

0.027

0.027

0.026
_
0.027


0.031
0.031
0.056
Colorado River
    Below Lake Granby           0.015      0.005        0.013     0.023     0.015        0.011     0.019
All values reported in mg/1 as N.

                                                    66

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                                               TABLE  34



          CONCENTRATIONS OF TOTAL KJELDAHL NITROGEN IN THE THREE LAKES AND THE COLORADO RIVER



        Location	     5/30      6/7-19       Ji/28      7/19       8/1         8/14      9/4-19
Lake Granby
Colorado River Ann (10)
surface
mid
bottom
Middle (14)
surface
mid
bottom
North (20)
surface
mid
bottom
Arapahoe Arm (5)
surface
mid
bottom
Shadow Mountain Lake
North (41)
surface
mid
bottom
Middle (37)
surface
mid
bottom
South (28)
surface
mid
bottom
Grand Lake
Middle (50)
surface
mid
bottom


0.21
0.20
0.24

0.28
0.16
0.24

0.31
-
0.20

0.20
0.22
0.29


0.26
-
-

0.24
.
0.24

0.36
-
0.26


0.23
0.24
0.18
— * •— i.. i •

0.15
_
0.16

0.31
0.27
0.28

0.24
0.27
0.35

0.29
_
0.31


0.23
_
0.42

0.32
„
0.26

0.28
_
1.60


0.48
0.46
0.48
•

0.22
0.19
0.18

0.24
0.19
0.19

0.26
0.22
0.27

0.17
0.26
0.24


0.18
.
—

0.25
—
0.23

0.21
_
0.20


0.14
0.14
0.13
. r .

.41
.22
.23

.54
.24
.22

.39
.22
.28

.28
.25
.21


.41
_
—

.53
«.
.31

.32
_
.26


.36
.22
.22
t. . ,,

.36
.16
.16

.19
.16
.16

.26
_
.

.26
.20
.10


_
_
m

.30
„
_

.36
.30
.24


.34
.22
.25
..I-—--

.16
.12
.13

.14
.12
.09

.26
.24
.17

.21
.10
.09


.34
-
_

.20
-
.28

.16
-
.12


.34
.10
.14


0.28
-
0.25

0.40
0.45
0.67

0.34
-
0.65

0.26
0.22
0.24


0.35
-
-

0.24
-
0.29

0.18
.
0.22


0.30
0.23
0.25
Colorado River
    Below Lake Granby           0.26       0.29         0.26       .44         -             .15       0.34
    values reported In rag/1 as N.

                                                    67

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                                                TABLE 35



          CONCENTRATIONS OF NITRITE AND NITRATE NITROGEN IN THE THREE LAKES AND THE COLORADO RIVER



         Location	     5/30      6/7-19        6/28      7/19       8/1          8/14      9/4-19
Lake Granby
Colorado River Arm (10)
surface
mid
bottom
Middle (14)
surface
mid
bottom
North (20)
surface
middle
bottom
Arapahoe (5)
surface
mid
bottom
Shadow Mountain Lake
North (41)
surface
mid
bottom
Middle (37)
surface
mid
bottom
South (28)
surface
STd
bottom

Grand Lake
Middle (50)
surface
mid
bottom


0.001
0.050
0.066

0.024
0.049
0.065

0.009
-
0.013

0.023
0.020
0.070


0.001
-
_

0.001
_
0.001

0.001
.
0.001
0.


0.065
0.068
0.078
-.I -.. • i. -

0.003
-
<0.061

<0.001
0.002
0.060

0.001
0.020
0.025

0.001
-
0.001


0.009
_
0.022

<0.001
—
0.019

0.001
-
0.001



0.025
0.039
0.092
' 	

0.001
0.001
0.050

0.001
0.001
0.063

0.001
0.001
0.022

0.001
0.001
0.067


0.001
-
_

0.001
_
0.001

0.001
.
0.001



0.011
0.018
0.072
• * •' —

0.001
0.014
0.068

0.002
0.001
0.078

0.002
0.009
0.023

0.001
0.002
0.076


0.001
.
„

0.001
_
0.003

0.001
.
0.022



0.001
0.011
0.067
~* •

0.004
0.016
0.094

0.001
0.006
0.095

0.002

.

0.001
0.001
0.058


-
_
.,

0.001

_

0.003
-
0.035



0.005
0.005
0.088
~r • *

0.003
0.026
0.100

0.001
O.OOS
0.100

0.001
0.001
0.003

0.001
0.017
0.109


0.001

—

0.002

0.004

0.032
-
0.047



0.001
0.011
0.085
-' • •

0.002

0.135

0.001
0.009
0.106

O.P03

0.003

0.002
0.004
0*095


<0.001

—

0.001

<0.001

0.028
-
0.053



0.001
0.024
0.253
Colorado River
    Below Lake Granby           0.064      0.065        0.003     0.033     0.005        0.044     0.043
All values reported in mg/1 as N.
                                                  68

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                                                TABLE 36
               CONCENTRATIONS OF TOTAL  PHOSPHATE IN THE! THREE LAKES AND THE COLORADO RIVER
         Location
                                                         6/28
                                   7/19
                                  8/1
Colorado River
    Below Lake Granby
0.024
                                           9/4-19
Lake Granby
Colorado River Arm (10)
surface
mid
bottom
Middle (14)
surface
mid
bottom
North (20)
surface
mid
bottom
Arapahoe Arm (5)
surface
mid
bottom
Shadow Mountain Lake
North (41)
surface
mid
bottom
Middle (37)
surface
mid
bottom
South (28)
surface
mid
bottom
Grand Lake
Middle (50)
surface
mid
bottom


0.020
0.031
0.025

0.022
0.014
0.013

0.020
-
0.018

0.014
0.015
0.019


0.020
_

0.083
_
0.022

0.026
_
0.026


0.020
0.020
0.011
•

0.010
-
0.015

0.013
0.014
0.026

0.012
0.016
0.027

0.008
_
0.014


0.017
0.040

0.018
„
0.019

0.033
„
0.240


0.006
0.008
0.009
— . j,.-r. -

0.011
0.014
0.016

0.009
0.016
0.012

0.009
0.017
0.012

0.010
0.015
0.041


0.014
_

0.030
—
0.018

0.013
_
0.015


0.006
0.007
0.007
..._!.__ 	

0.016
0.009
0.009

0.009
0.010
0.013

0.011
0.011
0.011

0.021
0.009
0.010


0.019
_

0.023
_
0.013

0.009
_
0.011


0.009
0.006
0.005
	 ^J-: —

0.012
0.013
0.015

0.009
0.009
0.013

0.010

.

0.010
0.012
0.010


-
w

0.015
^
mf

0.014
0.018
0.013


0.014
0.012
0.009
~* • •

.012
.010
.011

.011
.on
.013

.014
.017
.017

.012
.010
.011


0.025
_

0.016
«
0.023

0.015

0.014


0.026
0.007
0.007


0.013

0.034

0.009
0.009
0.013

0.010

0.015

0.015
0.013
0.021


0.016


0.021

0.006

0.016

0.019


0.004
0.001
0.001
0.010
0.022
0.011
                                            o.on
                                                                                          0.008
                                                        0.026
All values reported in mg/1 as P.
                                                   69

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                                                TABLE 37
                CONCENTRATIONS OF ORTHOPHOSPHATE IN THE THREE LAKES AND THE COLORADO RIVER
         Locations
                                              8/1
                                               8/14
                                            9/4-19
Lake Granby
Colorado River Arm (10)
surface
mid
bottom
Middle (14)
surface
mid
bottom
North (20)
surface
mid
bottom
Arapahoe Arm (5)
surface
mid
bottom
Shadow Mountain Lake
North (41)
surface
mid
bottom
Middle (37)
	 surface
mid
bottom
South (28)
surface
mid
bottom
Grand Lake
Middle (50)
surface
mid
bottom


0.002
0.011
0.004

0.006
0.002
0.002

0.003
-
0.003

0.002
0.002
0.006


0.003
-
_

0.052
_
0.005

0.008
-
0.004


0.001
0.001
0.001


0.004
-
0.005

0.003
0.003
0.007

0.004
0.004
0.005

0.002
-
0.004


0.005
.
0.008

0.005
-
0.005

0.003
-
0.016


0.002
0.003
0.004
— i , .1 — , -

0.006
0.008
0.009

0.009
0.006
0.010

0.004
0.008
0.007

0.003
0.002
0.013


0.001
_
_

(LOQ1
_
0.002

0.002
-
0.003


0.001
0.002
0.002
i

0.013
0.009
0.010-

0.008
0.009
0.010

0.008
0.010
0.010

0.019
0.009
0.010


0.009
_
_

0.010
.
0.007

0.006
_
-


0.005
0.004
0.007
i i ii

0.001
0.002
0.004

0.001
0.001
0.004

0.001
-
_

0.001
0.001
0.001


.
_
_

rum
_
„

0.001
-
0.003


0.001
0.002
0.001
	 J

0.002
0.001
0.003

0.001
0.001
0.004

0.002
-
0.003

0.001
0.001
0.023-


0.003
.
—

0.002
_
0.004

0.002
_
0.003


0.005
0.001
0.001
—

0.003
_
0.009

0.001
0.001
0.005

0.001
.
0.004

0.002
0.004
0.006


O.OOZ
_
„

Q fl?1
_
0.006

0.001
-
0.001


0.001
0.001
0.001
Colorado River
    Below Lake Granby
0.007
0.006
0.014
0.010
0.001
0.008
0.017
All values reported in mg/1 as P.
                                                     70

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Figure lU.
The Effect on the Seven-Day Maximum Standing Crop of
Gelenastrum capricornutun of Various Nutrient Additions
to Water Taken From Lake Granby, Shadow Mountain Lake
and Grand Lake. Colorado, 197**•
                                   3  _
                               •&
                               Q
                                   1  _
                                   0
                                  2
                                  1
                              71

-------
 weight/1.   The  maximum  standing  crop  in any culture flask is defined as
 the maximum algal  biomass  achieved during  the  incubation period (seven days).

      In  order to facilitate ease in discussion, only the yields for the
 control  and the highest maximum  standing crop  yields for single nitrogen,
 phosphorus, and combined spikes  are shown.  In general, incremental increases
 in  the concentration  of the limiting  nutrient  (phosphorus or nitrogen)
 resulted in increased growth, while increases  in the concentration of the
 non-limiting nutrient produced no additional growth from the control level.

      Results of the Colorado River algal assay indicate phosphorus limitation
 at  the time of  sampling.   Single additions of  nitrogen did not result in
 increased  growth  from the  control level, while single additions of phosphorus
 produced markedly  higher maximum standing  crops.

      Results of the Shadow Mountain algal  assay indicate both phosphorus
 and  nitrogen limitations at the  time  of sampling.  Neither single additions
 of  phosphorus nor  nitrogen resulted in maximum standing crops markedly greater
 than the control  level.  A large increase  in growth from the control level
 occurred,  however, with addition of the combined nitrogen and phosphorus
 spike.   The reported  value of orthophosphorus  (0.052 mg/1 P on May 30, 1974)
 is  likely  in error in view of the algal assay  results.  Although both
 nitrogen and phosphorus were limiting at the time of sampling, the limiting
 nutrient in  Shadow Mountain Reservoir may change during different times of
 the  year due to the reversible flow-thru characteristic of the reservoir.
 Additional  algal assays would be necessary to  document shifts in the limiting
 nutrient due to seasonal and/or  man-induced hydrological changes.

      Lake  Granby was  nitrogen limited at the time of sampling.  Single
 additions  of nitrogen resulted in a marked increase in the maximum standing
 crop from  the level of the control.  Single additions of phosphorus, however,
 resulted in  no additional growth.  As expected, the highest maximum yields
 were observed in the  combined spikes.  The algal assay with water from Grand
 Lake indicated nitrogen limitation at the time of sampling.  Single additions
 of nitrogen resulted  in increased maximum standing crop, while single
 additions  of phosphorus did not.  The combined phosphorus and nitrogen spikes,.•
 however, did not result in additional growth from the level observed in the
 single nitrogen spike, a condition possibly indicative of secondary micro-
 nutrient limitation.

     Although nitrogen was identified as the limiting nutrient at the time
of sampling  in Grand Lake some incongruities in the data exist.  It should
 be noted that the surface nutrient concentrations reported for 5/30/74
 (date of collection of algal  assay water) are dissimilar from samples
collected during the following months.  The differences in nutrient con-
centration noted on May 30, 1974 may be due to sampling during or slightly
after spring overturn.  On May 30, 1974 Grand Lake was nearly isothermal,
only a slight change in temperature being noted with depth.  Recorded
surface temperature was 6.5°C while at 76m (250 ft) the temperature was
 5°C.  On 5/30/74, nitrite-nitrate concentrations were similar throughout
                                 72

-------
the water column.  However, sampling during subsequent months  revealed
a strong stratification of nitrite-nitrate concentrations  with surface
concentrations significantly lower than values reported for  5/30/76.
Consequently, the algal assay results may not be indicative  of the  algal
growth potential during different times of the year.

     As previously stated, the algal assay indicated  nitrogen  limitation
in Grand Lake at the time of sampling.  On the basis  of the  water chemistry
at the time of sampling, however, the limiting nutrient was  phosphorus.
Theoretically, water having a TSIN : O-PO/j. ratio (total soluble inorganic
nitrogen {TSIN : N02 + NOa+NHa) : orthophosphate) of  greater than 11.3:1
would likely be phosphorus limited, while a ratio less than  11.3:1  would
be indicative of nitrogen limitation (Shiroyama, et al, 1975;  Greene,
et al; 1975).  The TSIN:P ratio for water collected from Grand lake on
5/30/74 was indicative of strong phosphorus limitation.

     The divergence between the observed and the theoretical limiting
nutrient may be due to chemical analysis.  On the basis of the dry  weight
yields, Shiroyama, et al, 1975 reported that dry weight yields could be
predicted if no toxic substances and all essential micronutrients were
present.  In the control and the single phosphorus spikes, the calculated
phosphorus concentration available was 0.008-0.009 mg/1 P  rather than  the
reported 0.001 mg/1 P (Shiroyama, et al, 1975; Greene, et  al,  1975).
With a per unit TSIN and orthophosphorus concentration of  0.009 mg/1 the
N:P ratio would be changed to 8.3:1.

     Additional algal assays are needed to document the limiting nutrient
in Grand Lake during different seasons of the year.  Variation in surface
nutrient concentrations in Grand Lake may also occur with  changes in
hydrologic regulation of Grand Lake and Shadow Mountain Reservoir.

     Miller, Maloney and Greene (1973) determined algal productivity in
49 lakes on the basis of dry weight yields of algal assays using Selenastrum
capricornutum.  Four productivity groups were defined:  (1)  low productivity
(0.00 - 0,10 nig dry weight I"1); (2) moderate productivity (0.11 -  0.80 mg dry
weight I"1); (3) moderately high productivity (0.81 - 6.00 mg dry weight  I"1);
and (4) high productivity (6.10 - 20.00 mg dry weight 1-1).   On the basis
of the yields in the control cultures, potential primary productivity in
the Three Lakes and the Colorado River downstream from Granby Reservoir
ranged from moderate to moderately high productivity.  As  previously stated,
however, the results of the algal assays reflect only the  conditions
existing at the time of sampling at the specific sampling  site.  Due to
the complex hydrological nature of the Three Lakes system  and the variation
observed in nutrient concentrations during this survey, additional  algal
assays are recommended.
                                 73

-------
APPENDIX A
SURVEY DATA
    74

-------
                           Three Lakes Study
                      Sampling Station Locations

Station No.                              Description
     1                Arapaho Creek at Bridge, Lake Granby
     2                Arapaho Bay, Lake Granby
     3                Roaring Fork Creek Mouth at Lake Granby
     4                Lake Granby, Transect at Twin Pines Point
     5                Lake Granby, Transett at Twin Pines Point
     6                Lake Granby, Transect at Twin Pines Point
     7                Lake Granby, Transect at Rocky Point
     8                Lake Granby, Transect at Rocky Point
     9                Lake Granby, Transect at Rocky Point
     10               Lake Granby at Grand Bay
     11               Twin Creek Mouth at Lake Granby
     12               Columbine Creek Mouth at Lake Granby
     13               Lake Granby, Transect at Sunset Point
     H               Lake Granby, Transect at Sunset Point
     15               Lake Granby, Transect at Sunset Point
     16               Lake Granby at Rainbow Bay
     17               Lake Granby at Kokanee Bay
     18               Lake Granby Midway Between Kokanee and Fish Bays
     19               Lake Granby, Transect Fish Bay to Rainbow Island
                                   75

-------
                      Sampling Station Locations
                              (Continued)

Station No.                               Description
     20               Lake Granby, Transect Fish Bay to Rainbow Island
     21               Lake Granby, Transect Fish Bay to Rainbow Island
     22               Lake Granby at NPS Campground Launch Area
     23               Lake Granby at Cutthroat Trout Bay
     24               Stillwater Creek near Shadow Mountain Lake
     24-A             Stillwater Creek at Arapaho National  Forest
     25               Soda Creek near Shadow Mountain Lake
     25-A             Soda Creek at Arapaho National Forest
     26               Shadow  Mountain - Granby Pump Canal
     27               Shadow  Mountain Lake, Transect at South  End of Lake
     28               Shadow  Mountain Lake, Transect at South  End of Lake
     29               Shadow  Mountain Lake, Transect at South  End of Lake
     30               Recreation Area STP Evaporation Pond
     31               Colorado River at Shadow Mountain Lake
     31-A             Colorado River in Rocky Mountain  National  Park
     32               Shadow  Mountain Lake, Transect at North  Side of Islands
     33               Shadow  Mountain Lake, Transect at North  Side of Islands
     34               Shadow  Mountain Lake, Transect at North  Side of Islands
     35               Shadow  Mountain Lake  at Boat  Docks West  Side of Lake
     36               Shadow  Mountain Lake, Transect at Center of Lake
     37               Shadow  Mountain Lake, Transect at Center of Lake
                                   76

-------
                      Sampling Station Locations
                              (Continued)

Station No.                              Description
     38               Shadow Mountain Lake, Transect at Center of Lake
     39               Shadow Mountain Lake at Boat Docks West Side of Lake
     40               Shadow Mountain Lake, Transect at North End of Lake
     41               Shadow Mountain Lake, Transect at North End of Lake
     42               Shadow Mountain Lake, Transect at North End of Lake
     43               Grand Lake STP Effluent
     44               Little Columbine Creek near Grand Lake/Shadow Mountain Lake
     45               Grand Lake at Outlet Between Lakes
     46               Grand Lake, Transect at West End of Lake
     47               Grand Lake, Transect at West End of Lake
     48               Grand Lake, Transect at West End of Lake
     49               Grand Lake, Transect at Center of Lake
     50               Grand Lake, Transect at Center of Lake
     51               Grand Lake, Transect at Center of Lake
     52               Grand Lake North Inlet
     53               Grand Lake, Transect at East End of Lake
     54               Grand Lake, Transect at East End of Lake
     55               Grand Lake, Transect at East End of Lake
     56               Grand Lake Inlet to Adams Tunnel
     57               Grand Lake East Inlet
     58               Colorado River Downstream Lake Granby
                                   77

-------
                       Primary Productivity Rates for Lake Granby
                9/13/74
9/11/74
Station
  47
  50
  54
Depth
(Meters)
Surf.
2.4
4.75
Surf.
2.5
5.0
Surf.
2.75
5.5
Surf.
2.6
5.2


Productivity Rate Station
Mg C/m3/day
59.4 14
50.5
15.5
29.9 16
48.6
27.7
30.2 20
56.7
28.2
52.5 23
66.7
25.1
Primary Productivity Rates
Grand Lake and Shadow Mountain
9/10/74
Depth Productivity Rate Station
(Meters) Mg C/m3/day
Surf.
2.3
4.6
Surf.
2.75
5.5
Surf.
2.75
5.5
50.8 28
48.7
10.4
87.3 33
29.4
6.3
135.1 37
51.6
10.0
Depth Productivity Rate
(Meters) Mg C/nr/day
Surf.
2.5
5.0
Surf.
2.4
4.75
Surf.
2.3
4.6
Surf.
2.0
4.0
for
Lake
61.4
71.3
17.3
56.2
59.8
27.4
48.2
53.5
23.7
50.0
4.9
17.8


9/9/74
Depth Productivity Rate
(Meters) Mg C/m3/day
Surf.
2.4
4.0
Surf.
2.4
4.0
Surf.
2.4
4.75
71.0
44.6
6.5
98,0
53.8
18.9
80.5
48.6
5.9
                                           78

-------
THREE LAKES STUDY
Station: 1 Arapaho
Date
Time
Temp.
Flow
pH
Conductivity
DO
BO 05
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Clo Residual
Turbidity
Alkalinity
Suspended Sol Ids
T. Coli.
F. Coli.
Creek at Lake
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
6 ran by
74/06/07
1300
4.5
14.3
7.2
<50
9.6
1
0.28
0.040
0.007
0.005
0.002
-
0.37
12.4
5
12
2

74/06/09
0730
1.0
-
7.9
<50
10.3
<1
0.19
0.032
0.003
0.005
0.003
-
0.52
12.4
3
<1
<1

74/06/10
0740
1.0
-
7.3
<50
10.3
<1
0.24
0.030
0.003
0.002
0.001
-
0.46
12.4
4
<1
<1
       79

-------
THREE LAKES STUDY
Station: 3 Roaring
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Clg Residual
Turbidity
Alkalinity
Suspended Solids
T, Coli.
F. Coli.
Fork at Lake
Yr/Mo/Day
Mtly.
Cent.
nvVs
SU
ytnhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/ 100ml
Granby
74/06/07
1315
2.0
1.7
7.2
<50
9.7
<1
0.36
0.039
0.012
0.008
0.003
-
0.31
10.3
5
2
2

74/06/09
0745
0
-
7.0
<50
10.4
<1
0.12
0.044
0.002
0.004
0.004
-
0.26
10.3
3
<1
<1

74/06/10
0800
0
-
7.5
<50
10.8
<1
0.22
0.038
0.021
0.013
0.001
-
0.38
12.4
2
<1
<1
       80

-------
THREE LAKES STUDY
Station: 11 Twin
Date
Time
Temp.
Flow
pH
Conductivity
DO
BODs
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
C12 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
P. Coli.
Creek at Lake
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
vimhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
Gran by
74/06/07
1015
3.0
0.6
7.4
<50
10.0
<1
0.16
0.002
0.003
0.009
0.003
-
0.64
8.2
7
10
<2

74/06/09
1030
2.0
-
7.3
<50
10.2
<1
0.18
0.006
<0.002
0.015
0.006
-
0.67
12.4
8
<1
<1

74/06/10
1000
3.0
-
7.1
<50
10.3
<1
0.19
0.002
0.003
0.006
0.004
- -
0.72
10.3
6
1
1
       81

-------
THREE LAKES STUDY
Station: 12 Col
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl£ Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
umbine Creek at
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ytnhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/ 100ml
Lake Granby
74/06/07
1100
2.5
0.8
7.4
<50
9.9
<1
0.17
0.006
0.004
0.007
0.002
-
0.42
-
4
5
<2

74/06/09
1100
1.0
-
7.3
<50
10.2
<1
0.18
0.009
0.003
0.025
0.004
-
0.79
12.4
6
1
1

74/06/10
1025
3.0
-
7.4
<50
10.2
<1
0.23
0.004
0.002
0.051
0.001
-
0.49
8.2
3
3
3
       82

-------
                              THREE LAKES STUDY
Station:  24   Stillwater Creek near Shadow Mt.  Lake
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/TOOml
#/100ml
74/06/14
1045
11.0
1.0
8.0
98
8.2
1.3
0.61
0.027
0.011
0.155
0.067
-
4.8
41.2
31
300
240
74/06/16
1025
11.5
-
7.7
no
8.4
1.1
0.40
0.029
0.007
0.107
0.066
-
5.9
43.3
35
600
550
74/06/17
1205
15.0
-
7.5
100
7.6
1.3
0.63
0.023
0.010
0.201
0.071
-
6.9
45.3
43
620
430
                                     83

-------
THREE LAKES STUDY
Station: 24-A
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Stillwater Creek
Yr/Mo/Day
Mtly.
Cent.
ID3/S
SU
vimhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
at Arapaho National
74/06/14
1020
7.5
1.1
7.6
<50
8.8
1.1
0.55
0.003
0.025
0.154
0.041
-
1.7
14.4
8
<1
<1
Forest
74/06/16
1005
8.0
-
7.1
<50
8.8
1.1
0.26
0.003
<0.002
0.036
0.026
-
1.6
12.4
10
<1
<1

74/06/17,
1235
10.5
-
7.2
<50
8.3
<1
0.30
0.001
0.003
0.036
0.024
-
1.7
14.4
7
2
<2
       84

-------
THREE LAKES STUDY
Station: 25 Soda
Date
Time
Temp.
Flow
pH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coll.
Creek near Shadow
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
Mt. Lake
74/06/11
1130
9.5
0.08
7.4
67
8.3
1.2
0.72
0.006
0.018
0.058
0.039
-
6.0
26.8
10
110
100

74/06/12
1320
13,5
-
7.4
89
7.5
<1
0.70
0.009
0.020
0.078
0.050
-
6.0
31.0
11
56
56

74/06/13
0930
10.5
-
7.4
76
7.9
1
0.79
0.007
0.012
0.084
0.052
-
3.6
28.8
10
180
75
       85

-------
                              THREE LAKES STUDY
Station:  25-A   Soda Creek at Arapaho National Forest
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+NC-3-N
NH3-N
Total -P
Ortho-P
Clg Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/ 100ml
74/06/11
1100
6.0
0.3
7.2
<50
8.8
<1
0.30
0.001
0.011
0.027
0.020
-
2.0
10.3
5
15
15
74/06/12
1300
11.0
-
7.1
<50
7.8
<1
0.17
0.006
0.016
0.041
0.036
-
0.78
10.3
4
<1
<1
74/06/13
0910
5.0
-
7.3
<50
9.1
<1
0.31
0.001
<0.002
0.028
0.016
-
0.9
10.3
4
8
2
                                     86

-------
THREE LAKES STUDY
Station: 26 Shadow
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NHs-N
Total -P
Ortho-P
Cl£ Residual
Turbidity
Alkalinity
Suspended Solids
T. Coll.
F. Coli.
Mountain /
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/ 100ml
Granby Pump Canal
74/06/14
0930
13.0
-
7.5
55
8.0
<1
0.57
0.001
0.004
0.014
0.005
-
2.8
18.5
8
2
2

74/06/15
0905
13.5
-
7.5
55
7.9
1.1
0.52
0.002
<0.002
0.019
0.003
-
2.8
18.5
9
15
3

74/06/16
0900
13.0
-
7.7
55
7.9
1.4
0.31
0.004
<0.002
0.019
0.007
-
3.1
18.5
10
-
^
       87

-------
                              THREE LAKES STUDY
Station:  30   Recreation Area STP Evaporation Pond
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl£ Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/100ml
74/06/14
1105
18
*
7.6
165
4.3
4
2.6
0.001
0.132
0.255
0.237
0
4.1
70
12
5
5
74/06/15
1005
17
*
7.9
165
3.3
4
8.0
0.004
0.204
0.352
0.42
0
4.5
68
9
8
4
74/06/16
1045
18
*
7.6
165
2.2
4
1.9
0.004
0.204
0.459
0.42
0
5.6
68
9
10
5
 * No  discharge.

-------
                              THREE LAKES STUDY
Station:  31  Colorado River at Shadow Mountain Lake
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
vmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/100ml
74/06/14
1130
10
-
7.9
<50
8.6
1.1
0.57
0.006
0.009
0.016
0.009
-
4.2
16.5
18
36
20
74/06/15
1015
9
-
7.5
<50
8.8
<1
0.49
0.008
0.003
0.038
0.007
-
4.7
16.5
19
130
32
74/06/16
1100
8.5
-
8.1
<50
9.0
<1
0.40
0.008
0.003
0.038
0.007
-
5.0
12.4
19
80
44
                                     89

-------
                              THREE LAKES STUDY
Station:  31-A   Colorado River in Rocky Mountain National Park
Date
Time
Temp.
Flow
pH
Conductivity
DO
BODs
TKN
N02+N03-N
NHs-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coll.
F. Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
vimhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
74/06/14
1240
9.0
6.3
7.5
<50
8.7
<1
0.37
0.013
0.018
0.008
0.007
-
2.2
16.5
10
55
10
74/06/15
1100
7.0
-
7.0
<50
8.9
1.2
0.89
0.013
<9.002
0.022
0.005
-
2.8
18.5
11
36
24
74/06/16
1200
8.0
-
7.1
<50
8.8
1.2
0.22
0.013
<0.002
0.019
0.005
-
2.4
14.4
11
35
30
                                     90

-------
                              THREE LAKES  STUDY
Station:  43
Date
Time
Temp.
Flow

pH
Conductivity
DO
BOD5
TKN
               Grand
NH3-N
Total -P
Ortho-P
Cig Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Lake STP Effluent
Yr/Mo/Day
Mtly.
Cent.
m3/s
su
pmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100nil
#/100ml

74/06/14
1215
9.0
O.OlOa
O.OOSb
7.1
75
6.5
31
7.8
0.116
2.6
1.71
0.73
0
9.5
35
31
700,000
500,000

74/06/15
1040
8.0
-
6.4
170
6.5
34
8.2
0.014
2.7
1.92
0,82
0.5
12
30.9
21
10
6

74/06/16
1120
9.0
-
6.7
170
6.2
38
13.0
0.119
2.9
2.03
T.06
0.15
13
37.1
29
270
60
a  -  Normal flow reported by plant personnel with lift station operating.
t,  -  Measured flow during sampling period without lift station.
                                     91

-------
                              THREE LAKES STUDY
Station:  44   Little Columbine Creek near Grand Lake
Date
Time
Temp.
Flow
pH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cig Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
74/06/14
1210
15
0.1
8.0
89
-
<1
0.48
0.017
0.022
0.059
0.038
-
3.0
37.1
15
1200
950
74/06/15
1030
13
-
6.4
72
7.7
<1
0.45
0.018
0.021
0.072
0.038
-
3.1
37.1
11
3500
2700
74/06/16
1115
14
-
7.7
90
7.5
1.0
0.42
0.021
0.029
0.083
0.047
-
3.3
37.1
10
7300
3400
                                    92

-------
THREE LAKES STUDY
Station: 52 Grand
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Ci2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
p. Coli.
Lake North Inlet
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100rnl
#/100ml

74/06/17
0830
4.0
7.3
7.1
<50
10.4
<1
0.24
0.028
0,007
0.016
0.004
-
0.82
6.2
6
28
20

74/06/18
0805
3.0
-
7.2
<50
10.1
<1
0.21
0.026
-
0.036
0.005
-
0.85
4.1
3
25
17

74/06/19
0825
4.5
-
6.7
<50
10.0
1.2
0.39
0.024
<0.002
0.010
0.001
-
1.6
4.1
5
20
14
       93

-------
THREE LAKES STUDY
Station: 57 Grand
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Lake East Inlet
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
pmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml

74/06/17
1020
5.0
11.5
6,5
<50
10.3
<1
0.28
0.021
0.005
0.012
0.002
-
0.68
4.1
6
26
23

74/06/18
0935
4.5
-
6.9
<50
10.2
<1
0.25
0.020
0.005
0.053
0.001
-
0.61
4.1
3
8
4

74/06/19
0945
6.0
-
6.8
<50
10.1
<1
0.61
0.024
0.002
0.010
0.005
-
0.56
4.1
2
54
25
      94

-------
                              THREE LAKES STUDY
Station:  58   Colorado River Downstream Lake Granby
Date
Time
Temp.
Flow*
pH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/ 100ml
74/06/07
1400
6.5
2.26
7.5
80
9.4
1.6
0.39
0.076
0.019
0.025
0.007
-
0>.94
26.8
13
70
5
74/06/09
1205
6.5
1.90
7.3
69
9.3
<1
0.30
0.068
0.012
0.017
0.009
-
0.93
24.7
4
180
160
74/06/10
1325
10.0
1.90
7.7
65
8.9
<1
0.29
0.065
0.005
0.010
0.006
-
0.63
12.4
5
6
4
 * Flow values  obtained from USGS.
                                     95

-------
                                                    THREE LAKES STUDY
to
en
Station: 2 Lake Granby - Arapahoe Bay
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/06/07
0710
S
3.5
7.5
<50
9.7
0.68
0.034
<0.002
0.011
0.004
10.3
0.47
10
10
74/06/09
0710
S
1.5
8.1
<50
10
0.38
0.033
0.002
0.005
0.001
IB. 4
0.46
4
2
74/06/10
0725
S
2.0
7.9
<50
10.1
0.26
0.029
<0.002
0.001
0.001
14.4
0.66
1
1
74/06/07
0710
B
3.5
7.4
<50
9.0
0.46
0.032
<0.002
0.017
0.006
14.4
0.56
-
-
74/06/09
0710
B
2.5
7.8
<50
9.6
0.30
0.027
<0.002
0.009
<0.001
14.4
0.76
-
-
74/06/10
0725
B
2.5
7.7
<50
10.1
0.25
0.024
<0.002
0.001
0.001
12.4
0.51
-
-
          Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
VO
Station: 4 Lake Granby - Transect at Twin Pines Point
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
S = Surface
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100nrt
#/100ml
M = Thermocline
74/06/07
0830
S
9.5
8.0
60
9.9
0.53
0.001
<0.002
0.021
0.003
24.7
0.85
4
<2
B =
74/06/09
0830
S
7.5
8.0
59
9.0
0.42
0.005
<0.002
0.011
0.003
20.6
0.62
2
2
Bottom
74/06/10
0830
S
8.0
7.8
60
9.1
0.29
0.001
<0.002
0.008
0.002
20.6
0.66
<1
<1

74/06/07
0830
B
6.0
7.8
55
8.4
0.32
0.035
0.003
0.018
0.003
22.7
3.0
-
-

74/06/09
0830
B
6.0
7.6
83
8.4
0.28
0.036
0.004
0.012
0.002
22.7
0.95
-
-

74/06/10
0830
B
7.6
7.9
60
8.9
0.31
<0.001
0.002
0.014
0.004
22.7
0.66
-
-


-------
                                                    THREE LAKES STUDY
00
Station: 5
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Twin
Yr/Mo/Day
Mtly.

Cent.
su
u mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
f /100ml
#/100ml
74/06/07
0815
S
9.0
8.1
61
9.4
0.35
0.001
<0.002
0.016
0.003
26.8
0.79
20
2
74/06/09
0815
S
7.5
7.9
59
8.9
0.26
0.006
<0.002
0.013
0.002
22.7
0.63
<1

-------
                                                     THREE LAKES STUDY
VO
vo
Station: 6 Lake Granby - Transect at Twin
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coll.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
u mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
74/06/07
0730
S
9.0
7.8
57
9.4
0.33
0.001
<0.002
0.016
0.004
20.6
0.72
28
5
Pines Point
74/06/09
0800
S
7.5
7.7
57
9.0
0.28
0.005
0.003
0.019
0.003
22.7
0.63
4
4

74/06/10
0810
S
7.5
7.7
59
9.2
0.26
0.002
0.003
0.010
0.003
20.6
0.72
2
<1

74/06/07
0730
B
9.0
8.1
59
9.1
0.40
0.001
<0.002
0.017
0.004
22.7
0.75
-
-

74/06/09
0800
B
7.0
7.6
<50
8.7
0.28
0.011
0.002
0.016
0.002
20.6
0.86
-
-

74/06/10
0810
B
6.0
7.6
56
8.5
0.30
0.015
0.003
0.013
0.004
20.6
0.71
-
-
       S  = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKE STUDY
o
o
Station: 7
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Rocky Point
Yr/Mo/Day
Mtly.

Cent.
SU
11 mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
f /1 00ml
#/100ml
74/06/07
0850
S
8.5
8.1
58
9.2
0.32
0.001
0.003
0.013
0.003
24.7
0.70
<2
<2
74/06/09
0900
S
7.0
8.1
66
9.1
0.26
0.005
<0.002
0.017
0.003
24.7
0.60
<1
<1
74/06/10
0640
S
7.5
7.0
69
9.1
0.29
0.001
0.001
0.017
0.004
22.7
0.83
<1
<1
74/06/07
0850
M
7.5
7.8
64
8-. 8
0.28
0.018
0.003
0.011
0.004
24.7
0.78
-
-
74/06/09
0900
M
6.0
7.9
68
8.5
0.28
0.029
0.004
0.011
0.002
26.8
0.80
-
-
74/06/10
0640
M
5.5
7.2
68
8.3
0.20
0.041
0.010
0.010
0.003
22.7
0.71
•
-
74/06/07
0850
B
6.0
7.5
74
8.7
0.50
0.039
0.007
0.076
0.006
26.8
32
-
-
74/06/09
0900
B
4.5
7.6
61
8.0
0.22
0.067
0.013
0.009
0.003
26.8
0.86
-
-
74/06/1 (
0640
B
4.5
7.2
68
8.1
0.32
0.058
0.014
0.057
0.009
24.7
23
-
-
     S = Surface
M = Thermo dine
B = Bottom

-------
                                                THREE LAKES STUDY

Station:  8   Lake Granby - Transect at Rocky Point
Date          Yr/Mo/Day  74/06/07  74/06/09  74/06/10  74/06/07  74/06/09  74/06/10  74/06/07  74/06/09  74/06/10
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
0910
S
9.0
8.0
61
9.4
0.31
0.001
<0.002
0.011
0.005
24.7
0.69
<2
<2
0910
S
7.5
8.1
62
9.1
0.28
0.004
0.004
0.013
0.003
24.7
0.68
1
<1
0855
S
7.5
8.1
60
9.2
0.22
0.002
0.012
0.013
0.004
20.6
0.69
<1
<1
0910
M
7.0
7.7
62
8.9
0.29
0.024
0.003
0.012
0.003
24.7
0.68
-
-
0910
M
8.0
8.1
60
9.1
0.26
0.004
0.002
0.012
0.003
24.7
0.71
-
-
0855
M
7.5
7.8
60
8.8
0.23
0.017
0.005
0.011
0.004
22.7
0.65
-
-
0910
B
5.0
7.8
65
8.2
0.31
0.067
0.014
0.012
0.004
22.7
0.69
-
-
0910
B
4.5
7.6
55
8.0
0.28
0.068
0.015
0.016
0.005
24.7
0.94
-
-
0855
B
5.0
7.6
66
8.3
0.15
0.067
0.015
0.011
0.004
22.7
2.5
-
-
S = Surface      M = Thermocline      B = Bottom

-------
                                               THREE LAKES STUDY
Station: 9
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Rocky Point
Yr/Mo/Day
Mtly.

Cent.
SU
VL mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/ 100ml
74/06/07
0930
S
8.5
7.8
58
9.3
0.35
0.001
<0.002
0.013
0.003
24.7
0.86
<2
<2
74/06/09
0930
S
7.0
7.8
60
9.0
0.26
0.004
0.002
0.011
0.004
22.7
0.68
<1
<1
74/06/10
0915
S
7.0
8.3
60
9.2
0.15
0.001
0.004
0.010
0.002
22.7
0.66
<1
<1
74/06/07
0930
M
9.0
7.6
55
8.9
0.25
0.004
0.004
o:on
0.002
20.6
0.67
-
mm
74/06/09
0930
M
6.5
7.8
54
8.5
0.40
0.019
0.002
0.010
0.003
18.5
0.63
-
—
74/06/10
0915
M
7.0
7.8
60
8.7
0.18
0.016
0.001
0.014
0.003
20.6
0.71
-
—
74/06/07
0930
B
4.5
7.5
63
8.0
0.27
0.070
0.017
0.009
0.003
26.8
0.72
-
_
74/06/09
0930
B
4.0
7.6
64
7.8
0.26
0.071
0.014
0.006
0.004
24.7
0.66
-

74/06/1 C
0915
B
6.0
7.7
60
8.2
0.14
0.038
0.009
0.009
0.003
22.7
0.71
-

S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE  LAKES  STUDY
o
CO
Station: 10
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Grand Bay
Yr/Mo/Day
Mtly>

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/06/07
0950
S
9.5
7.8
<50
8.'6
0.30
0.001
0.003
0.012
0.003
18.5
0.84
2
<2
74/06/09
1000
S
8.0
7.5
50
8.4
0.31
0.004
<0.002
0.008
0.002
20.6
0.74
1
1
74/06/10
0930
S
8.0
7.7
58
8.8
0.15
0.003
0.003
0.010
0.004
18.5
0.71
<1
<1
74/06/07
0950
B
5.0
7.5
61
7.8
0.56
0.062
0.033
0.053
0.009
24.7
6
-
-
74/06/09
1000
B
5.0
7.3
60
7.6
0.39
0.064
0.024
0.060
0.011
26.8
14
-
-
74/06/10
0930
B
5.0
7.4
68
7.8
0.16
0.061
0.023
0.015
0.005
22.7
4
-
-
       S  =  Surface
M = Thermocline
B = Bottom

-------
                                         THREE LAKES STUDY
Station: 13
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Sunset Point
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
74/06/11
0745
S
8.0
8.0
<50
9.1
0.34
<0.001
<0.002
0.012
0.002
24.7
0.83
<1
<1
74/06/12
0730
S
9.2
8.1
<50
9.0
0.14
0.001
0.006
0.019
0.008
22.7
0.91
<1
<1
74/06/1 3
0720
S
10.0
7.8
<50
10.0
0.34
0.001
<0.002
0.020
0.002
20.6
1.5
2
<1
74/06/11
0745
B
8.0
7.9
<50
9.1
0.32
<0.001
0.002
0.048
0.004
22.7
4.0
-
-
74/06/12
0730
B
9.0
8,3
<50
9. '3
0.30
<0.001
0.012
, 0.022
0.008
22.7
0.67
-
-
74/06/13
0720
B
9.5
8.1
50
8.1
0.33
0.003
<0.002
0.035
0.003
22.7
3
-
-
Surface
M = Thermocline
B = Bottom

-------
                                                     THREE LAKES STUDY
o
en
Station: 14
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect of Sunset Point
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/06/11
0800
S
8.5
8.2
<50
9.1
0.23
<0.001
<0.002
0.013
0.001
22.7
0.80
<1
<1
74/06/12
0740
S
9.0
8.3
60
9.1
0.22
<0.001
0.016
0.020
0.008
22.7
0.63
<1
<1
74/06/1 3
0730
S
9.0
8.2
62
9.2
0.31
<0.001
0.002
0.013
0.003
22.7
0.71
<1
<1
74/06/11
0800
M
7.0
7.7
50
8.8
0.20
0.013
0.005
0.028
0.002
24.7
0.79
-
_
74/06/12
0740
M
8.0
7.8
60
8.8
0.24
0.003
0.011
0.016
0.005
22.7
0.62
-
_
74/06/13
0730
M
7.5
8.0
63
8.9
0.27
0.002
<0.002
0.014
0.003
22.7
1.1
-
_
74/06/11
0800
B
5.0
7.9
<50
7.8
0.20
0.062
0.021
0.020
0.004
24.7
3.0
-
_
74/06/1 2
0740
B
5.0
7.3
65
7.3
0.53
0.060
0.036
0.126
0.018
24.7
9.0
-
_
74/06/1
0730
B
5.0
7.9
<50
7.8
0.28
0.060
0.015
0.026
0.007
24.7
2.5
-
-
     S= Surface
M = Thermocline
B = Bottom

-------
                                                    THREE  LAKES  STUDY
CD
cn
Station: 15
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Sunset Point
Yr/Mo/Day
Mtly.

Cent.
SU
pmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/06/11
0815
S
9.0
8.2
<50
9.1
0.21
<0.001
<0.002
0.012
0.001
22.7
0.81
1
<1
74/06/12
0800
S
8.2
8.0
60
9;1
0.26
0.001
0.009
0.016
0.007
22.7
0.71
<1
<1
74/06/13
0745
S
9.0
8.0
59
9.0
0.34
0.002
<0.002
0.015
0.002
22.7
0.82
2
<1
74/06/11
0815
B
6.0
7.5
<50
8.3
0.94
0.045
0.014
0.268
0.011
24.7
17.0
-
-
74/06/12
0800
B
7.7
7.9
<50
8.7
0.18
0.002
0.011
0.017
0.007
22.7
0.73
-
-
74/06/13
0745
B
8.0
7.7
58
8.6
0.37
0.010
<0.002
0.028
0.002
22.7
1.4
-
-
     S = Surface
M = Thermo dine
B = Bottom

-------
                                                THREE LAKES STUDY
Station: 16
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Rainbow Bay
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
0/lOOml
#/ 100ml
74/06/11
0720
S
8.0
8.1
61
9.6
0.26
<0.001
<0.002
0.020
0.003
22.7
0.82
1
1
74/06/12
0710
S
9.0
8.1
60
9.1
0.18
0.002
0.007
0.016
0.008
22.7
0.68
<1
<1
74/06/13
0705
S
9.5
7.7
67
9.2
0.34
0.009
<0.002
0.014
0.004
22.7
1.2
<1
<1
74/06/11
0720
M
6.0
7.8
60
8.2
0.19
0.030
0.007
0.017
0.003
24.7
0.96
-
_
74/06/12
0710
M
6.5
7.6
<50
8.8
0.11
0.022
0.012
0.014
0.007
22.7
0.93
-
_
74/06/13
0705
M
8.5
8.1
<50
9.1
0.30
<0.001
<0.002
0.016
0.003
22.7
1.2
-
-
74/06/11
0720
B
5.0
7.5
<50
7.8
0.18
0.058
0.022
0.034
0.007
24.7
6.0
-
-
74/06/12
0710
B
5.0
7.5
50
7.6
0.15
0.052
0.022
0.017
0.009
24.7
3.0
-
-
74/06/1
0705
B
6.0
7.5
<50
7.6
0.24
0.044
0.017
0.021
0.006
24.7
2.8
-
-
S = Surface
M = Thermocline
B = Bottom

-------
                                              THREE LAKES STUDY
Station: 17
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coll.
F. Coli.
Lake Granby - Transect at Kokanee Bay
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/ 100ml
74/06/11
0705
S
8.0
7.8
66
9.1
0.18
0.000
0.004
0.016
0.002
24.7
0.91
4
1
74/06/12
0655
S
8.5
8.1
62
9.2
0.16
0.003
0.003
0.021
0.014
22.7
0.71
<1
<1
74/06/13
0650
S
8.5
7.9
58
9.1
0.22
0.002
<0.002
0.012
0.003
22.7
1.2
1
1
74/06/11
0705
B
7.5
7.7
<50
9.2
0.24
0.000
0.003
0.018
0.003
26.8
2.0
-
_
74/06/12
0655
B
8.5
8.2
63
8.7
0.16
0.003
0.012
0.018
0.009
22.7
0.88
-
—
74/06/13
0650
B
8.7
7.9
<50
9.1
0.29
0.003
0.009
0.013
0.004
22.7
1.5
-
_
S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES  STUDY
o
vo
Station: 18
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Between Kokanee and Fish Rays
Yr/Mo/Day
Mtly.

Cent.
SU
ynihos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/06/11
0655
S
7.0
8.0
55
9.2
0.16
0.001
0.003
0.017
0.002
22.7
0.92
<1
<1
74/06/12
0640
S
9.0
8.0
58
9.0
0.17
0.001
0.011
0.021
0.012
22.7
0.75
2
2
74/06/1 3
0640
S
8.0
8.1
62
9.1
0.27
0.001
<0.002
0.020
0.008
22.7
1.2
8
<1
74/06/1 1
0655
B
6.5
7.5
68
8.6
0.21
0.013
0.006
0.021
0.003
24.7
2.0
-
-
74/06/12
0640
B
9.0
8.1
60
9.1
0.24
<0.001
0.012
0.016
0.004
22.7
0.65
-
-
74/06/13
0640
B
8.5
8.2
<50
9.2
0.19
0.001
0.005
0.013
0.002
22.7
1.4
-
-
      S = Surface
M = Thermocline
B = Bottom

-------
                                              THREE LAKES STUDY
Station: 19
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect Fish Bay to Rainbow
Yr/Mo/Day
Mtly.

Cent.
SU
y mhos
mg/l
mg/1
mg/l
mg/1
mg/l
mg/l
mg/l
JTU
#/100ml
#/100ml
74/06/11
0640-
S
7.0
7.9
60
8.8
0.24
0.004
0.003
0.014
0.004
22.7
0.96
2
2
74/06/12
0630
S
8.5
8.2
50
9.1
0.20
0.005
0.011
0.013
0.003
22.7
0.78
1
<1
Island
74/06/13
0625
S
8.5
8.1
55
9.1
0.26
0.001
<0.002
0.047
0.038
22.7
0.90
<1
<1

74/06/1 1
0640
B
6.5
7.8
68
8.9
0.25
0.006
0.004
0.023
0.006
24.7
3.0
-
_

74/06/12
0630
B
8.5
8.2
60
9.1
0.21
0.004
0.008
0.023
0.015
22.7
0.82
-
_

74/06/13
0625
B
8.0
8.1
62
9.0
0.25
0.001
<0.002
0.029
0.011
22.7
1.2
-
_
S = Surface
M = Thermocline
B = Bottom

-------
                                                THREE  LAKES  STUDY
Station: 20
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect Fish Bay to Rainbow Island
Yr/Mo/Day
Mtly.

Cent.
SU
y mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/06/11
0855
S
8.5
8.0
67
8.9
0.22
0.001
0.006
0.012
0.004
24.7
0.84
1
1
74/06/12
0825
S
9.0
8.3
<50
9.1
0.27
<0.001
0.013
0.015
0.003
24.7
0.72
2
2
74/06/1 3
0815
S
9.5
8.0
50
9.0
0.24
0.001
<0.002
0.012
0.004
24.7
1.0
10
<1
74/06/11
0855
M
6.5
7.6
60
8.3
0.16
0.030
0.009
0.013
0.004
24.7
0.88
-
_
74/06/12
0825
M
8.0
8.0
<50
8.4
0.13
0.007
0.015
0.015
0.001
22.7
0.71
-
_
74/06/1 3
0815
M
8.0
7.9
<50
8.1
0.27
0.020
<0.002
0.016
0.004
22.7
1.2
-
-
74/06/11
0855
B
6.5
7.5
<50
8.3
0.31
0.030
0.011
0.059
0.006
22.7
5.0
-
-
74/06/12
0825
B
7.0
8.0
50
8.3
0.28
0.016
0.009
0.021
0.002
22.7
2.0
-
-
74/06/1
0815
B
7.0
7.6
<50
8.2
0.35
0.025
0.006
0.027
0.005
22.7
1.5
-
-
S = Surface
M = Thermocline
B = Bottom

-------
                                             THREE LAKES STUDY
Station: 21
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NHrN
Tota7-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coll.
Lake Granby - Transect Fish Bay to Rainbow
Yr/Mo/Day
Mtly.

Cent.
SU
y mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
74/06/1 1
0845
S
8.5
7.9
62
8.9
0.20
0.002
0.005
0.023
0.005
26.8
1.0
<1
<1
74/06/12
0820
S
8.0
8.3
58
8.8
0.16
0.001
0.009
0.076
0.004
20.6
0.69
<1
<1
Island
74/06/13
0800
S
9.5
8.5
<50
9.2
0.24
0.002
<0.002
0.013
0.004
22.7
1.1
28
1

74/06/11
0845
B
8.0
7.8
60
8.5
0.24
0.003
0.003
0.021
0.005
24.7
0.91
-
-

74/06/12
0820
B
8.0
8.0
<50
8.9
0.45
0.002
o.on
0.042
0.006
22.7
6.0
-
-

74/06/13
0800
B
8.5
7.8
<50
8.6
0.35
0.003
<0.002
0.023
0.006
22.7
1.2
-
-
S = Surface
M = Thermocline
B = Bottom

-------
                                             THREE LAKES STUDY
Station: 22
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coll-
Lake Granby at
Yr/Mo/Day
Mtly.

Cent.
SU
u mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
Campground
74/06/11
0625
S
7.0
7.4
<50
9.'1
0.18
0.001
0.003
0.300
0.289
24.7
0.95
2
<1
Launch Area
74/06/12
0620
S
7.5
7.6
<50
8.8
0.27
0.003
0.014
0.016
0.003
24.7
0.72
7
4

74/06/13
0615
S
9.0
8.0
60
9.1
0.30
0.001
<0.002
0.125
0.118
24.7
1.0
8
<1
S = Surface

-------
                                             THREE LAKES STUDY
Station: 23 Lake Granby at
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
vmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
OTU
#/100ml
#/100ml
Cutthroat Trout Bay
74/06/11
0915
S
9.0
8.4
<50
8.9
0.24
<0.001
0.010
0.024
0.006
26.8
2.0
60
44
74/06/12
0850
S
8.5
8.0
<50
9.0
o.-n
0.003
0.022
0.014
0.002
22.7
O.BB
16
7
74/06/13
0830
S
8.0
7.9
62
9.0
0.40
0.001
<0.002
0.014
0.009
22.7
1.2
23
2
74/06/11
0915
S
6.0
7.3
<50
7.7
0.27
0.029
0.011
0.023
0.007
24.7
3.0
-
-
74/06/12
0850
S
8.5
7.8
<50
8.7
0.16
0.002
0.011
0.022
0.004
22.7
0.96
-
-
74/06/13
0830
S
7.0
7.5
62
8.2
0.83
0.013
<0.002
0.114
0.011
22.7
4.0
-
-
S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE  LAKES  STUDY
en
Station: 27
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
ymnos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
rng/1
JTU
#/100ml
#/100ml
- Transect at
74/06/14
0640
S
10
7.6
<50
8.3
0.41
<0.001
<0.002
0.010
0.002
16.5
2.3
8
8
South End of
74/06/15
0725
S
11
7.7
52
8.0
0.27
0.001
<0.002
0.017
0.002
18.5
2.6
23
3
Lake
74/06/16
0730
S
11
7.6
<50
7.7
0.32
0.001
0.004
0.019
0.003
14.4
2.4
9
1
      S = Surface

-------
                                             THREE LAKES STUDY
Station: 28
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
- Transect at
74/06/14
0630
S
10
7.7
<50
8.6
0.51
0.002
<0.002
0.106
0.102
16.5
2.0
4
4
South End of
74/06/1 5
0715
S
11.5
7.8
<50
8.1
0.37
0.003
<0.002
0.016
0.002
16.5
2.3
16
<1
Lake
74/06/16
0720
S
11.0
7.8
<50
8.4
0*28
0.001
<0.002
0.033
0.003
14.4
2.2
8
<1

74/06/14
0630
B
7.5
7.6
<50
6.7
0.36
<0.001
<0.002
0.026
0.009
18.5
3.8
-
-

74/06/15
0715
B
10
7.4
<50
7.3
0.65
<0.001
0.002
0.104
0.005
16.5
3.7
-
-

74/06/16
0720
B
10.5
7.6
<50
7.8
1.6
0.001
0.004
0.240
0.016
14.4
16
-
-
S = Surface
M = Thermocline
B = Bottom

-------
                                              THREE LAKES STUDY
Station: 29
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- Transect at
74/06/14
0630
S
10.5
7.5
<50
8.5
0.39
0.002
<0.002
0.009
0.004
16.5
1.8
<1
<1
South End of
74/06/15
0710
S
10.5
7.6
<50
8.2
0.37
<0.001
<0.002
0.016
0.002
16.5
2.0
14
<1
Lake
74/06/16
0715
S
11.0
7.8
<50
8.2
0.72
0.001
<0.002
0.071
0.005
14.4
2.2
2
1
S = Surface

-------
                                                    THREE LAKES STUDY
oo
Station: 32 Shadow Mt. Lake
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
v mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
- Transect at
74/06/14
0645
S
9.5
7.8
<50
8.2
0.31
0.003
<0.002
0.012
0.005
14.4
3.3
100
36
North Side of
74/06/15
0730
S
10
7.5
<50
8.1
0.84
0.003
0.004
0.023
0.004
16.5
4.5
170
22
Islands
74/06/16
0735
S
11
7.7
<50
8.1
0.20
0.002
<0.002
0.021
0.006
12.4
3.2
39
21
      S  = Surface

-------
                                              THREE LAKES STUDY
Station: 33
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
11 mhos
mg/1
mg/1
rng/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
- Transect at
74/06/14
0655
S
10
7.6
<50
8.5
0.27
0.001
0.008
0.009
0.002
16.5
1.8
3
3
North Side of
74/06/15
0735
S
11.5
7.8
<50
8.1
0.41
0.004
<0.002
0.018
0.003
16.5
1.9
4
<1
Islands
74/06/16
0740
S
11
7.5
<50
8.3
0.32
<0.001
<0.002
0.018
0.005
14.4
1.8
9
5

74/06/14
0655
B
9.5
7.3
<50
8.4
0.59
0.001
<0.002
0.082
0.007
16.5
6.6
-
_

74/06/15
0735
B
10.5
7.6
<50
8.1
0.49
0.002
0.003
0.042
0.005
16.5
5.6
-
-

74/06/16
0740
B
10
7.7
<50
8.6
0.28
0.001
<0.002
0.035
0.005
12.4
3.3
-
-
S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
ro
o
Station: 34 Shadow Mt. Lake
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- Transect at
74/06/14
0710
S
10
7.7
<50
8.8
0.35
<0.001
<0.002
0.015
0.004
16.5
2.0
12
3
North Side of
74/06/15
0745
S
11.5
7.7
<50
8.2
0.64
0.001
0.003
0.044
0.004
16,5
2.4
6
<1
Islands
74/06/16
0750
S
11.5
7.6
<50
8.1
0.30
<0.001
<0.002
0.024
0.005
12.4
2.0
3
3
      S = Surface

-------
                                                     THREE LAKES  STUDY
r>o
Station: 35
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
I/I 00ml
- At Boat Docks West Side of Lake
74/06/14
0835
S
11
7.5
<50
8.3
0.35
0.002
0.003
0.010
0.003
18.5
1.8
<1
<1
74/06/15
0845
S
12
7.5
<50
8.2
0.31
0.001
0.011
0.018
0.003
16,5
1.8
<1
<1
74/06/16
0815
S
11
7.3
<50
7.9
0.38
<0.001
<0.002
0.022
0.005
16.5
2.1
5
4
      S = Surface

-------
                                                     THREE LAKES STUDY
ro
PO
Station: 36 Shadow Mt. Lake
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/100ml
- Transect at
74/06/14
0740
S
11
7.6
<50
8.5
0.34
0.001
0.007
0.009
0.003
16.5
1.7
4
<1
Center of Lake
74/06/15
0805
S
11
7.7
<50
8.2
0.44
0.003
<0.002
0.030
0.003
14.4
2.0
15
11
74/06/16
0810
5
11
7.5
<50
8.3
0.39
0.001
0.013
0.031
0.005
12.4
1.6
4
3
      S = Surface

-------
                                                    THREE LAKES STUDY
ro
co
Station: 37
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T.'Coll.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- Transect at
74/06/14
0735
S
10
7.7
<50
8.4
0.28
<0.001
<0.002
0.007
0.003
18.5
1.8
4
<1
Center of Lake
74/06/15
0755
S
10.5
7.8
<50
8.4
0.37
0.005
<0.002
0.021
0.001
16.5
1.7
29
9
74/06/16
0805
S
11
7.5
<50
8.4
0.32
<0.001
<0.002
0.018
0.005
14.4
1.9
7
5
74/06/14
0735
B
9.0
7.3
<50
7.8
1.30
0.001
0.020
0.186
0.012
16.5
17.0
-
-
74/06/15
0755
B
10.5
7.' 3
<50
7.9
2.5
0.008
0.045
0.382
0.013
14.4
18
-
-
74/06/16
0805
B
9.0
7.6
<50
8.9
0.26
0.019
<0.002
0.019
0.005
12.4
1.4
-
-
      S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE  LAKES STUDY
I\3
Station: 38 Shadow Mt. Lake
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
#/100ml
#/100ml
- Transect at
74/06/14
0725
S
10
7.7
<50
8.0
0.31
<0.001
<0.002
0.039
0.005
14.4
2.0
4
1
Center of Lake
74/06/15
0750
S
10
7.8
<50
7.6
0.31
0.001
0.023
0.029
0.003
18.5
2.3
16
2
74/06/16
0755
S
11
7.6
<50
7.9
0.28
0.003
<0.002
0.013
0.005
14.4
2.0
3
<1
      S  =  Surface

-------
                                                      THREE LAKES STUDY
rv>
CJ1
Station: 39
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- At Boat Docks West Side of Lake
74/06/14
0750
S
11
7.6
<50
8.3
0.34
0.001
0.011
0.015
0.004
16. 5
1.8
5
2
74/06/15
0810
S
10
7.5
<50
8.6
0.28
0.003
<0.002
0.020
0.002
16.5
2.0
20
9
74/06/16
0815
S
11
7.5
<50
8.4
0.30
0.002
<0.002
0.011
0.005
14.4
1.6
19
12
      S  =  Surface

-------
                                                     THREE LAKES  STUDY
ro
CTt
Station: 40
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
u mhos
mg/1
mg/1
mg/1
rag/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- Transect at
74/06/14
0800
S
10
7.6
<50
8.6
0.37
0.003
<0.002
0.013
0.004
14.4
1.5
30
23
North End of
74/06/15
0815
S
10
7.4
<50
8.9
0.32
0.015
0.005
0.024
0.001
12.4
1.3
90
70
Lake
74/06/16
0820
S
9.0
7.3
<50
8.7
0.23
0.020
0.047
0.010
0.004
10.3
0.82
11
9
       S = Surface

-------
                                                     THREE LAKES STUDY
ro
Station: 41
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/ 100ml
- Transect at
74/06/14
0810
S
11
7.6
<50
8.3
0.40
0.001
<0.002
0.013
0.004
14.4
1.5
12
10
North End of
74/06/15
0820
S
11
7.4
<50
8.6
0.19
0.015
<0.002
0.014
0.001
12.4
1.3
57
28
Lake
74/06/16
0830
S
10.5
7.4
<50
8.6
0.23
0.009
<0.002
0.017
0.005
12.4
1.5
10
8

74/06/14
0810
B
8.5
7.4
<50-
8.9
0.29
0.024
<0.002
0.041
0.004
12.4
0.8
-
-

74/06/15
0820
B
8.0
7.2
<50
8.9
-
0.030
0.007
0.027
0.002
11.3
7.9
-
-

74/06/16
0830
B
10.5
7.4
<50
8.6
0.42
0.022
<0.002
0.040
0.008
10.3
5.8
-
-
       S = Surface

-------
                                                    THREE LAKES STUDY
CO
Station: 42
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
iimhos
mg/1
mg/1
rng/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/ 100ml
- Transect at
74/06/14
0820
S
11
7.5
<50
s;i
0.52
0.002
<0.002
0.068
0.004
16.5
1.6
7
7
North End of
74/06/1 5
0825
S
11.5
7.4
<50
8.3
0.59
0.001
<0.002
0.027
0.003
16.5
2.1
16
12
Lake
74/06/1 (
0835
S
11
7.4
<50
8.0
0.38
0.001
0.055
0.015
0.005
14.4
1.9
3
3
       S = Surface

-------
                                                     THREE LAKES STUDY
ro
Station: 45
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake at Outlet Between
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/06/17
0745
S
7.5
7.5
<50
9.0
0.22
0.027
<0.002
0.009
0.005
10.3
0.68
10
1
Lakes
74/06/18
0720
S
6.5
7.4
<50
9.0
0.27
0.027
<0.002
0.013
0.003
10.3
7.8
4
4

74/06/19
0745
S
7.0
7.1
<50
8.9
0.54
0.028
<0.002
0.004
0.001
10.3
0.58
5
4

74/06/17
0745
B
7.0
7.4
<50
8.9
0.30
0.034
0.008
0.061
0.042
10.3
0.68
-
-

74/06/'
0720
B
6.5
7.5
<50
8.9
-
-
-
-
-
10.3
0.65
-
-
                                                                                                               74/06/19
                                                                                                                  B
                                                                                                                   ef.
                                                                                                                   GO
      S = Surface
M = Thermocline
B = Bdttom

-------
                                                    THREE  LAKES STUDY
CO
o
Station: 46
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at West
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
I/I 00ml
#/100ml
74/06/1 7
0750
S
7.0
7.2
<50
9.0
0.20
0.028
<0.002
0.011
0.006
10.3
0.64
2
2
End of Lake
74/06/18
0725
S
6.5
7.5
<50
8.9
0.22
0.028
<0.002
0.010
0.003
10.3
0.65
7
2

74/06/19
0750
S
7.0
7.2
<50
8.9
0.79
0.025
0,004
0.005
0.001
10.3
0.56
2
<1

74/06/17
0750
B
7.5
7.4
<50
9.0
0.29
0.028
<0.002
0.017
0.007
10.3
0.61
-
-

74/06/18
0725
B
6.5
7.3
<50
8.8
0.22
0.028
<0.002
0.019
0.004
12.4
0.66
-
-

74/06/19
0750
B
6.5
7.1
<50
9.0
0.45
0.030
0.007
0.019
0.010
10.3
0.74
-
-
       S =  Surface
M = Thermo dine
B = Bottom

-------
                                                THREE LAKES STUDY
Station: 47
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at West
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100m1
#/100ml
74/06/17
0800
S
7.0
7.2
<50
9.0
0.26
0.028
<0.002
0.009
0.003
10.3
0.58
6
1
74/06/18
0735
S
7.0
7.2
<50
8.9
0.21
0.029
<0.002
0.013
0.003
12.4
0.85
1
1
End of Lake
74/06/19
0755
S
7.5
7.1
<50
8.9
0.50
0.027
<0.002
0.005
0.001
10.3
0.63
2
1
74/06/17
0800
M
6.0
7.1
<50
8.9
0.24
0.037
0.016
0.013
0.004
12.4
0.68
-
_
74/06/18
0735
M
6.0
7.4
<50
8.9
0.23
0.033
<0.002
0.015
0.003
10.3
0.61
-
_
74/06/19
0755
M
6.0
7.1
<50
8.6
0.37
0.039
0.004
0.015
0.007
12.4
1.6
-
-
74/06/17
0800
B
5.0
7.1
<50
8.1
0.38
0.048
0.008
0.065
0.005
12.4
2.3
-
-
74/06/18
0735
B
5.0
7.2
<50
8.7
0.21
0.039
0.004
0.016
0.003
10.3
0.62
-
-
74/06/1
0755
B
5.0
7.1
<50
8.7
0.50
0.045
0.004
0.013
0.005
14.4
0.76
-
-
S = Surface
M = Thermocline
B - Bottom

-------
                                                    THREE LAKES STUDY
ro
Station: 48
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at West
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
tl 100ml
#/ 100ml
74/06/17
0820
S
7.5
7.1
<50
8.9
0.25
0.023
<0.002
0.011
0.001
12.4
0.61
6
1
End of Lake
74/06/18
0750
S
6.5
7.2
<50
8.9
0.19
0.030
<0.002
0.012
0.003
10.3
0.57
11
5

74/06/19
0800
S
7.5
7.2
<50
9.0
0.35
0.028
<0.002
0.007
0.001
10.3
0.50
2
.1

74/06/17
0820
B
7.0
7.2
<50
8.9
0.45
0.030
<0.002
0.085
0.008
10.3
3.0
-
-

74/06/18
0750
B
6.6
7.1
<50
9.0
0.22
0.030
<0.002
0.013
0.003
10.3
5.2
-
-

74/06/19
0800
B
7.5
7.2
<50
8.9
0.44
0.031
<0.002
0.011
0.004
10.3
0.58
-
-
       S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
co
CO
Station: 49
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
TurbijdTty
T. Coli.
F. Coli,
Grand Lake - Transect at Center of Lake
Yr/Mo/Day
Mtly.

Cent.
SU
y mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/100ml
74/06/17
0910
S
7.0
7.0
<50
8.9
0.23
0.026
0.003
0.024
0.001
10.3
0.55
3
2
74/06/18
0835
S
7.5
7.1
<50
9.0
0.37
0.029
<0.002
0.029
0.003
10.3
0.54
5
4
74/06/19
0900
S
9.0
7.3
<50
8.8
0.63
0.026
<0.002
0.007
0.001
10.3
0.62
3
<1
74/06/17
0910
B
7.5
7.1
<50
8.9
0.24
0.028
0.008
0.013
0.001
10.3
0.68
-
-
74/06/18
0835
B
7.0
7.0
<50
8.9
0.26
0.032
<0.002
0.015
0.002
10.3
0.66
-
-
74/06/19
0900
B
6.5
7.2
<50
8.8
0.34
0.032
<0.002
0.007
0.001
12.4
0.77
-
-
      S = Surface
M = Thermocline
B = Bottom

-------
                                                THREE LAKES STUDY
Station:   50   Grand Lake - Transect at Center of Lake
Date
Time
Depth
Temp.
PH
Conductivity
5 DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
umnos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
I/I 00ml
#/100ml
74/06/17
0855
S
8.0
7.0
<50
9.0
0.26
0.026
0.006
0.110
0.001
10.3
0.57
1
1
74/06/18
0820
S
7.5
7.2
<50
9.2
0.22
0.028
<0.002
0.040
0.002
10.3
0.59
17
6
74/06/19
0845
S
9.0
7.2
<50
9.0
0.48
0.025
<0.002
0.006
0.002
10.3
0.54
2
2
74/06/17
0855
V
5.5
7.0
<50
8.7
0.19
0.040
<0.002
0.058
0.001
10.3
0.56
-
_
74/06/18
0820
M
5.0
7.2
<50
8.5
0.18
0.040
0.007
0.038
0.002
12.4
0.65
-
_
74/06/19
0845
M
6.0
7.1
<50
8.7
0.46
0.039
0.002
0.008
0.003
12.4
0.64
-
_
74/06/17
0855
B
4.0
7.0
<50
6.6
0.27
0.085
0.042
0.027
0.003
18.5
1.5
-
_
74/06/18
0820
B
3.5
7.0
-50
5.5
0.68
0.083
0.075
0.171
0.010
18.5
9.6
-
_
74/06/1!
0845
B
4.5
7.0
50
5.9
0.48
0.092
0.018
0.009
0.004
18.5
1.3
-
-
 S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
CO
en
Station: 51
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- Transect at Center of Lake
74/06/17
0840
S
8.0
7.1
<50
9.1
0.30
0.026
<0.002
0.012
0.001
10.3
0.56
3
1
74/06/18
0810
S
7.0
7.1
<50
8.8
0.30
0.029
0.002
0.086
0.003
10.3
0.54
3
2
74/06/19
0830
S
8.0
7.0
<50
9.0
0.47
0.025
0.003
0.007
0.002
10.3
0.53
3
3
74/06/17
0840
M
6.0
7.0
<50
8.7
0.24
0.041
0.004
0.019
0.001
12.4
0.54
-
-
74/06/
0810
M




UJ
_)
Q.

-------
                                                   THREE LAKES STUDY
tx>
Station: 53
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at East
Yr/Mo/Day
Mtly.

Cent.
SU
vmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/06/17
0925
S
8.0
7.1
<50
9.2
0.30
0.028
0.013
0.009
0.001
10.3
0.50
3
2
End of Lake
74/06/18
0845
S
8.0
7.1
<50
8.8
0.28
0.029
0.004
0.040
0.003
10.3
0.54
7
4

74/06/19
0905
S
8.0
7.0
<50
9.0
0.38
0.029
<0.002
0.008
0.002
10.3
0.54
4
J

74/06/17
0925
B
6.0
7.0
<50
9.2
0,61
0.030
<0.002
0.016
0.006
10.3
0.58
-
-

74/06/18
0845
B
6.0
7.2
<50
9.3
0.23
0.027
0.008
0.049
0.002
10.3
0.56
-
-

74/06/19
0905
B
6.0
7.0
<50
9.1
0.35
0.046
<0.002
0.015
0.002
10.3
0.67
-
-
     S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
CO
Station: 54
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Goli.
F. Coli.
Grand Lake - Transect at East
Yr/Mo/Day
Mtly.

Cent.
SU
yltihoS
rag/1
mg/1
mg/1
rag/1
mg/1
rag/1
mg/1
JTU
#/100ml
#/100ml
74/06/17
0930
S
7.5
7.0
<50
8.8
-
0.026
<0.002
0.006
0.002
10.3
0.55
1
<1
74/06/18
0855
S
8.5
7.2
<50
8.9
0.22
0.025
<0.002
0.031
0.002
10.3
0.58
<1
<1
End of Lake
74/06/19
0915
S
10
7.3
<50
8.9
0.31
0.026
0.004
0.008
0.002
10.3
0.52
2
2
74/06/17
0930
M
6.5
6.9
<50
9.0
0.24
0.031
<0.002
0.011
0.002
12.4
0.58
-
-
74/06/18
0855
M
6.5
7.1
<50
8.9
0.26
0.034
0.003
0.047
0.002
10.3
0.52
-
-
74/06/19
0915
M
6.5
6.9
<50
8.9
0.82
0.039
0.005
0.008
0.012
10.3
0.57
-
-
74/06/17
0930
B
4.0
6.9
<50
6.8
0.40
0.081
0.011
0.018
0.007
20.6
0.75
-
-
74/06/18
0855
B
4.5
7.1
<50
6.9
0.59
0.084
0.020
0.126
0.009
18.5
5.9
-
-
74/06/1
0915
B
4.0
6.9
<50
7.0
0.50
0.082
0.005
0.044
0.007
20.6
3.2
-
-
     S = Surface
M = Therroocline
B = Bottom

-------
                                                    THREE LAKES STUDY
GJ
00
Station: 55 Grand Lake - Transect at East
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
vimhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
OTU
#/100ml
f /I 00ml
74/06/17
0945
S
8.0
7.0
<50
9.0
0.24
0.024
<0.002
0.010
0.002
10.3
0.53
4
3
End of Lake
74/06/18
0910
S
8.5
7.2
<50
9.0
0.28
0.025
0.003
0.065
0.003
10.3
0.61
2
1

74/06/19
0930
S
8.0
7.0
<50
9.1
0.25
0.031
<0.002
0.009
0.005
10.3
0.56
2
2

74/06/17
0945
B
7.0
7.0
<50
8.8
0.18
0.029
<0.002
0.013
0.002
10.3
0.49
-
-

74/06/18
0910
B
6.5
7.1
<50
9.0
0.34
0.029
0.007
0.043
0.003
10.3
0.56
-
-

74/06/19
0930
B
6.5
6.9
<50
8.8
0.32
0.033
<0.002
0.009
0.002
10.3
0.51
-
-
           Surface
M = Thermocline     B = Bottom

-------
                                                    THREE LAKES STUDY
CO
vo
Station: 56
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Inlet to Adams Tunnel
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/06/17
0950
S
8.0
7.0
<50
9.1
0.20
0.025
<0.002
0.012
0.002
10.3
0.49
19
6
74/06/18
0920
S
8.5
7.1
<50
8.7
0.51
0.025
0.002
0.045
0.002
10.3
0.56
2
2
74/06/19
0935
S
9.0
7.1
<50
8.7
0.50
0.029
<0.002
0.009
0.002
10.3
0.56
<1
<1
74/06/17
0950
B
7.0
6.9
<50
9.1
0.20
0.024
<0.002
0.011
0.002
10.3
0.53
-
-
74/06/1 8
0920
B
7.0
7.1
<50
9.0
0.44
0.032
0.003
0.046
0.001
10.3
0.61
-
-
74/06/19
0935
B
7.0
7.1
<50
9.1
0.42
0.032
0.003
0.009
0.002
10.3
0.77
—
-
      S = Surface
M = Thermocline
B = Bottom

-------
THREE LAKES STUDY
Station: 1 Arapaho
Date
Time
Temp.
Flow
pH
Conductivity
DO
BOD5
TKN
N02+N03-N
NHa-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coll.
F. Coli.
Creek at Lake
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/l 00ml
#/100ml
Granby
74/09/04
0830
12.5
-
7.1
47
7.2
1.4
0.50
0.004
0.026
0.019
0.002
-
1.4
37.4
2
<2
<2

74/09/05
0800
13.0
-
7.2
50
7.4
1.8
0.34
0.004
0.020
0.022
0.005
-
1.6
•41.6
2.5
18
10

74/09/06
0815
12.5
0.54
7.1
47
7.4
1.7
0.38
0.005
0.025
0.019
0.003
-
1.7
37.4
3
<1
<1
        140

-------
                              THREE LAKES STUDY
Station:  3   Roaring Fork at Lake Granby
Date
Time
Temp-
Flow
pH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
C12 Residual
Turbidity
Alkalinity
5USpended Solids
T0 Coli.
c Col i .
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
pmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/ 100ml
74/09/04
0850
4.0
-
7.3
42
9.5
1.0
0.14
0.014
0.019
0.006
0.001
-
0.13
35.4
<1
2
<2
74/09/05
0830
4.5
-
7.5
43
9.4
<1
0.03
0.017
0.017
0.008
0.002
-
0.18
41.6
<1
6
6
74/09/06
0835
5.0
0.08
7.4
42
9.4
1.0
0.03
0.014
0.013
0.004
<0.001
-
0.17
35.4
<1
11
2
                                      141

-------
THREE LAKES STUDY
Station: 11 Twin
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Creek at Lake
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/100ml
Gran by
74/09/04
mo
12.0
-
6.8
36
8.9
<1
0.16
<0.001
0.020
0.006
0.001
-
0.46
37.4
<1
4
<2

74/09/05
1025
6.5
0.02
7.3
44
9.0
<1
0.10
0.003
0.024
0.010
0.003
-
0.42
41.6
2
4
<1

74/09/06
1040
7.0
-
7.2
43
9.0
1.0
0.14
0.004
0.009
0.007
<0.001
_
0.37
35.4
<1
3
1
       142

-------
                             THREE LAKES STUDY
Date
Time
Temp.
Flow
pH
Conductivity
DO
BOD5
TKN
Total-P
Ortho-P
£l«  Residual
Turbidity
Alkalinity
suspended Solids
f. Coli.
c  Coli.
e Creek at
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
Lake Granby
74/09/04
1130
6.5
-
6.6
36
8.9
1.0
0.17
0.001
0.009
0.004
<0.001
-
0.46
35.4
1
8
4

74/09/05
1110
7.0
0.06
7.0
37
9.0
<1
0.16
0.003
0.023
0.006
0.001
1
0.41
35.4
<1
4
4

74/09/06
1100
7.0
-
7.0
38
9.1
1.1
0.14
0.004
0.023
0.004
<0.001
-
0.31
39.6

-------
                              THREE LAKES STUDY
Station:  24   Stillwater Creek near Lake Granby
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
pmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/100ml
74/09/09
1200
15.0
-
8.0
203
8.9
1.4
0.28
0.091
0.032
0.127
0.097
-
2.4
164
3
160
100
74/09/10
1145
14.0
0.05
8.7
215
8.7
2.1
0.48
0.092
0.036
0.122
0.096
-•
2.5
173
4
200
140
74/09/11
1105
14.0
-
7.8'
203
8.7
1.8
0.50
0.085
0.034
0.116
0.093
-
2.5
160
5
400
270
                                     144

-------
THREE LAKES STUDY
Station: 24-A St
Date
Time
Temp.
Flow
pH
Conductivity
DO
00D5
TKN
N02+N03"N
NH3-N
Total -P
Ortho-P
£lg Residual
Turbidity
Alkalinity
Suspended Solids
-]-. Coli.
ff Coli.
illwater Creek
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
vimhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/100ml
at Arapaho National
74/09/09
1220
12.0
-
7.1
79
8.2
1.6
0.06
0.011
0.030
0.072
0.063
-
0.72
47.8
1
<1
<1
Forest
74/09/10
1230
12.0
0.03
7.4
82
8.2
<1
0.23
0.009
0.019
0.068
0.064
-
0.56
47.8
2
12
2

74/09/11
1130
12.0
-
7.3
81
8.2
<1
0.13
0.009
0.018
0.066
0.064
-
0.45
47.8
3
<1
<-,
        145

-------
THREE LAKES STUDY
Station: 25 Soda
Date
Time
Temp.
Flow
pH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coll.
F. Coli.
Creek near Granby
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
pmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
Lake
74/09/09
1300
16.0
-
7.3
215
8.1
2.9
0.67
0.007
0.052
0.177
0.114
-
9.3
183
22
44
26

74/09/10
1330
16.5
0.001
7.6
215
7.8
3i2
1.26
0.008
0.042
0.237
0.135
-
80.0
185
33
240
130

74/09/11
1215
15.0
-
7.4
215
7.5
2.9
0.82
0.008
0.040
0.176
0.113
-
13.0
183
39
120
12
        146

-------
                              THREE LAKES STUDY
Station:  25-A   Soda Creek at Arapaho National Forest
Date
Time
Temp.
Flow
pH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
£-\2 Residual
Turbidity
Alkalinity
Suspended Solids
f. Coli.
f Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/l
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
74/09/09
1235
15.0
-
7.1
79
7.6
<1
0.24
0.005
0.031
0.045
0.029
-
2.6
58.2
2
2
2
74/09/10
1300
15.0
0.005
7.3
88
7.7
<1
0.54
0.007
0.030
0.040
0.033
-
3.0
60.4
1.5
12
2
74/09/11
1145
13.0
-
7.6
85
7.9
1.6
0.54
0.005
0.023
0.042
0.029
-
3.0
58.2
4
62
2
                                      147

-------
                      THREE LAKES STUDY
Station: 26 Shadow
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
C12 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Mountain/Granby
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
pmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/100ml
Pump Canal
74/09/12
0850
9.0
-
6.6
72
7.2
1.4
0.23
0.035
0.020
0.014
0.004
-
1.8
50.0
4
3
1

74/09/13
1030
7.0
-
6.9
64
5.3
1.0
0.30
0.089
0.030
0.013
0.005
-
2.1
47.8
4
2
<-,

74/09/16
1135
7.5
-
6.9
66
5.3
1.0
0.21
0.096
0.028
0.019
0.006
-
1.9
50.0
3
1
<•,
Flow from Lake Granby to Shadow Mt.  Lake
                             148

-------
                              THREE LAKES STUDY
Station:  30   Recreation Area STP Evaporation Pond
Date
Time
Temp.
plow
pH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Oftho-p
£-\2 Residual
Turbidity
Alkalinity
expended Solids
T. Coli.
c Col i .
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
vimhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/ 100ml
74/09/12
0930
7.0
*
7.8
226
5.3
48
14.0
0.191
1.00
1.96
0.500
0.0
73.0
135
456
2800
330
74/09/13
1115
13.0
*
9.6
181
15.9
12
3.2
0.006
0.038
0.940
0.688
0.0
15.0
141
96
800
200
74/09/16
1245
15.0
*
8.7
203
13.0
22
4.1
0.005
0.065
1.10
0.76
0.0
30
154
90
25
25
  * No discharge
                                       149

-------
THREE LAKES STUDY
Station: 31
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
C12 Residual
Turbidity
Alkalinity
Suspended Sol
T. Coli.
F. Coli.
Colorado River at
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
i ds mg/1
#/100ml
#/100ml
Shadow Mt. Lake
74/09/12
0920
6.5
0.93
7.4
90
9.3
1.0
0.14
0.003
0.019
0.018
0.005
-
2.0
60.0
3
43
32

74/09/13
1130
7.5
1.08
7.9
85
9.1
<1
0.16
0.003
0.028
0.014
0.008
-
2.6
62.0
6
19
14

74/09/16
1300
10.0
0.91
8.0
85
8.7
1.0
0.14
0.003
0.026
0.015
0.005
-
Ev5
71.0
2
7
4
        150

-------
                              THREE LAKES STUDY
Station:  31-A   Colorado River in  Rocky Mountain National  Park
Date
Time
Temp.
plow
pH
Conductivity
DO
TKN
Total-P
Ortho-P
Cig  Residual
Turbidity
Alkalinity
Suspended Solids
f. Coli.
c  Coli.
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
I/I 00ml
#/100ml
74/09/12
1145
5.5
-
7.5
90
8.6
<1
0.25
0.004
0.020
0.015
0.005
-
2,6
58.0
3
43
34
74/09/13
1215
8.0
-
6.9
75
8.8
1.4
0.16
0.003
0.032
0.011
0.004
-
2.6
.54.0
3
27
15
74/09/16
1400
8.0
0.59
5.4
82
8.7
<1
0.08
0.003
0.027
0.016
0.003
-
3.2
64.0
3
6
5
                                      151

-------
THREE LAKES STUDY
Station: 43 Grand
Date
Time
Temp.
Flow
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
C12 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Lake STP Effluent
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/ 100ml

74/09/12
1000
12.0
-
6.5
170
5.1
15
7.2
0.087
4.48
2.28
1.28
-
20.1
85.0
41
110
20

74/09/13
1145
11.0
-
6.8
170
4.2
17
7.2
0.075
4.17
1.74
1.11
0.0
7.1
100.0
34
810,000
620,000

74/09/16
1315
10.0
0.02
6.7
130
6.7
12
6.6
0.073
3.52
1.36
0.760
<1.0
9.5
66.0
14
130
30
       152

-------
                              THREE  LAKES STUDY

Station:  44   Little Columbine Creek  near Grand Lake
Date
Time
Temp.
Flow
pH
Conductivity
DO
BOD5
TKN
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/100ml
74/09/12
1010
8.0
*
7.0
102
6.3
1.5
0.26
0.006
0.022
0.040
0.019
-
4.0
79.0
7
180
140
74/09/1 3
1155
9.0
*
7.5
88
8.5
1.2
0.37
0.004
0.031
0.031
0.016
-
3.3
81 ;0
9
46
44
74/09/16
1320
10.0
*
7.4
93
8.3
<1
0.23
0.004
0.029
0.580
0.016
-
3.4
79.0
6
40
30
Total-P
Ortho-P
Clo  Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
c. Coli.
   *  Flow appeared to be uniform throughout the  study period, but was
      actually measured only on 9/18/74.  The measured flow was 0.08 m3/s.
                                      153

-------
THREE LAKES STUDY
Station: 52 Grand
Date
Time
Temp.
Flow
pH
Conductivity
DO
BODg
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Lake North Inlet
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/ 100ml
#/100ml

74/09/17
0940
5.0
-
6.8
25
9.2
<1
0.09
0.005
0.023
0.001
0.002
-
0.6
22.8
<1
2
1

74/09/18
0925
6.0
0.37
7.0
26
9.0
<1
0.16
0.006
0.027
0.003
0.001
-
0.61
16.6
<1
2
2

74/09/19
0915
5.5
-
7.3
25
9.2
<1
0.22
0.007
0.025
0.001
0.001
-
1.2
20.8
1
15
7
        154

-------
THREE LAKES STUDY
Station: 57 Grand
Date
Time
Temp.
Flow
pH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cig Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
c. Coli.
Lake East Inlet
Yr/Mo/Day
Mtly.
Cent.
m3/s
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/ 100ml

74/09/17
1110
6.5
-
6.5
20
9.3
<1
0.12
0.006
0.024
0.002
0.002
-
0.55
18.8
1
1
<1

74/09/18
1110
7.0
0.29
6.6
20
9.0
<1
0.12
0.004
0.024
0.001
0.001
-
0.35
1«.6
1
6
5

74/09/19
1030
6.0
-
7.3
20
9.1
<1
0.20
0.005
0.024
0.001
0.001
-
0.37
18.8
1
<1
<1
        155

-------
                              THREE LAKES STUDY
Station:  58   Colorado River Downstream Lake Granby
Date
Time
Temp.
Flow*
PH
Conductivity
DO
BOD5
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2 Residual
Turbidity
Alkalinity
Suspended Solids
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.
Cent.
mfys
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
mg/1
mg/1
#/100ml
#/100ml
74/09/04
1415
15.0
0.24
7.7
82
8.8
<1
0.40
0.046
0.027
0.045
0.024
-
2.5
67.0
4
22
16
74/09/05
1235
10.0
0.24
7.1
79
9.3
1.3
0.28
0.042
0.026
0.026
0.019
-
1.5
58.0
1.5
2
<1
74/09/06
1200
12.0
0.24
6.6
76
9.3
1.4
0.34
0.043
0.019
0.026
0.017
-
1.7
56.0
2
8
3
* Flow values obtained from USGS.
                                      156

-------
                                                    THREE LAKES STUDY
01
Station: 2 Lake Granby - Arapaho Bay
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/ 100ml
74/09/04
0835
S
14.0
7.4
55
7.4
0.40
0.001
0.011
0.021
0.006
52.0
1.6
<2
<2
74/09/05
0810
S
14.0
7.9
56
7.5
0.42
0.001
0.021
0.017
0.003
45.8
1.8
14
8
74/09/06
0825
S
14.0
7.9
55
7.3
0.34
0.002
0.021
0.014
0.003
47.8
1.6
2
1
74/09/04
0835
B
14.0
7.7
54
7.1
0.46
<0.001
0.006
0.017
0.002
41.6
2.0
-
-
74/09/05
0810
B
14.0
7.9
55
7.6
0.34
0.001
0.015
0.022
0.004
45.8
1.7
-
-
74/09/06
0825
B
14.0
7.4
53
7.3
0.28
0.004
0.025
0.013
0.003
43.6
2.0
-
-
      S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE  LAKES  STUDY
00
Station: 4 Lake Granby - Transect at Twin
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/04
0905
S
14.0
8.0
55
7.8
0.32
<0.001
0.020
0.015
0.002
45.8
1.3
<2
<2
Pines Point
74/09/05
0840
S
14.5
8.2
58
7.6
0.29
0.001
0.015
0.014
0.003
45.8
1.5
<1
<-,

74/09/06
0840
S
14.0
7.9
58
7.7
0.33
0.002
0.010
0.012
0.002
50.0
1.4
<1
<-,

74/09/04
0905
B
14.0
7.2
56
7.5
0.34
0.001
0.014
0.015
0.001
45.8
1.3
-


74/09/05
0840
B
13.5
7.5
58
6.4
0.40
0.002
0.016
0.018
0.004
47.8
1.2
_


74/09/06
0840
B
14.0
8.1
59
7.8
0.32
0.001
0.009
0.013
0.003
56.2
1.2
_

      S = Surface
M = Thermocline
B = Bottom

-------
                                                     THREE  LAKES  STUDY
en
vo
Station: 5
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Twin
Yr/Mo/Day
Mtly.

Cent.
SU
vtmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
74/09/04
0915
S
14.5
8.0
55
7.7
0.31
0.001
0.019
0.013
<0.001
45-8
1.5
2
2
74/09/05
0850
S
14.5
7.9
58
7.7
0.35
0.001
0.022
0.014
0.003
50.0
1.5
2
<1
Pines Point
74/09/06
0855
S
14.0
7.4
58
7.9
0.26
0.002
0.008
0.015
0.002
45.8
1.5
<1
<1
74/09/04
0915
M
14.0
7.2
55
7.5
0.33
0.001
0.029
0.016
0.001
45.8
1.4
-
_
74/09/05
0850
M
11.5
7.2
55
4.9
0.10
0.020
0.015
0.013
0.004
52.0
1.2
-
_
74/09/06
0855
M
10.0
6.6
59
4.7
0.22
0.044
0.016
0.013
0.004
45.8
1.5
-
-
74/09/04
0915
B
6.5
7.1
59
4.8
0.38
0.099
0.019
0.042
0.008
52.0
2.0
-
-
74/09/05
0850
B
12.0
6.9
54
4.8
0.12
0.093
0.018
0.019
0.006
50.0
1.9
-
-
74/09/0
0855
B
6.5
6.7
63
4.9
0.24
0.095
0.019
0.021
0.006
45.8
2.3
-
-
    S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
cr»
o
Station: 6 Lake Granby - Transect at Twin
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/04
0935
S
14.5
8.0
58
7.7
0.36
0.001
0.018
0.016
0.001
43.6
K6
<2
<2
Pines Point
74/09/05
0900
S
14.5
7.9
58
7.7
0.13
0.001
0.019
0.016
0.005
54.0
1.6
3
<1

74/09/06
0910
S
14.0
7.7
58
7.7
0.25
0.002
0.012
0.013
0.003
45.8
1.5
<1
<1

74/09/04
0935
B
15.0
7.9
58
7.6
0.37
0.001
0.037
0.016
0.002
43.6
1.7
-


74/09/05
0900
B
13.5
7.4
58
7.1
0.26
0.005
0.018
0.019
0.005
50.0
1.5
_


74/09/06
0910
B
14.0
7.9
59
7.9
0.28
0.001
0.014
0.017
0.004
45.8
1.5
_

      S = Surface
M = Thermocline
                                             B = Bottom

-------
                                               THREE LAKES STUDY
Station: 7
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Rocky Point
Yr/Ho/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/04
1005
S
15.0
7.7
56
7.5
0.28
0.001
0.017
0.016
<0.001
45.8
1.4
<2
<2
74/09/05
0930
S
14.5
7.9
58
7.7
0.26
0.001
0.017
0.013
0.004
60.4
1.4
<1
<1
74/09/06
0935
S
14.5
7.9
58
7.6
0.22
0.001
0.013
0.010
0.003
45.8
1.2
1
<1
74/09/04
1005
M
11.5
7.4
54
4.6
0.31
0.018
0.010
0.014
0.001
45.8
0.84
-
-
74/09/05
0930
M
13.0
7.7
59
6.0
0.20
0.007
0.020
0.014
0.004
47.8
1.3
-
-
74/09/06
0935
M
11.0
7.1
61
4.8
0.24
0.021
0.009
0.011
0.003
47.8
1.2
-
-
74/09/04
1005
B
10.0
7.3
58
4.7
0.54
0.033
0.012
0.100
0.007
50.0
13.0
-
-
74/09/05
0930
B
8.5
7.4
61
4.8
0.30
0.058
0.017
0.011
0.004
54.0
0.9
-
-
74/09/Qi
0935
B
7.5
7.0
62
4.9
0.26
0.071
0.007
0.012
0.004
47.8
1.1
-
-
S = Surface
M = Thermocline
                                     B  = Bottom

-------
                                                     THREE LAKES STUDY
CT»
ro
Station: 8
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Rocky Point
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/04
1020
S
15.0
7.4
56
7.5
0.33
<0.001
0.013
0.010
<0.001
43.6
1.5
<2
<2
74/09/05
0940
S
14.0
7.9
59
7.6
0.20
0.002
0.012
0.013
0.002
47.8
1.4
<2
<1
74/09/06
0945
S
14.0
7.4
59
7.7
0.24
0.002
0.010
0.010
0.003
47.8
1.8
<1
<1
74/09/04
1020
M
13.0
7.0
58
5.6
0.28
0.005
0.012
. 0.015
0.001
45.8
1.1
-
—
74/09/05
0940
M
11.5
7.4
60
5.0
0.20
0.016
0.014
0.014
0.003
50.0
1.3
-
_
74/09/06
0945
M
11.0
6.9
59
4.8
0.33
0.024
0.016
0.008
0.003
45.8
0.74
-

74/09/04
1020
B
12.0
7.4
55
5.3
0.24
0.112
0.015
0.022
0.005
47.8
5.7
_

74/09/05
0940
B
7.0
7.4
61
5.3
0.14
0.106
0.013
0.013
0.006
50.0
1.3
«.

74/09/0
0945
B
7.0
6.8
62
5.2
0.29
0.096
0.010
0.007
0.004
47.8
1.1
—

    S = Surface
M = Thermocline
B = Bottom

-------
                                                     THREE LAKES STUDY
CO
Station: 9
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Goli.
F. Coli.
Lake Granby - Transect at Rocky Point
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/04
1035
S
14.5
7.4
56
7.5
0.42
<0.001
0.023
0.011
<0.001
58.2
1.3
<2
<2
74/09/05
0950
S
14.0
7.9
58
7.7
0.20
0.001
0.013
0.011
0.002
45.8
1.3
<1
<1
74/09/06
1000
S
14.5
7.6
59
7.7
0.24
0.002
0.012
0.009
0.003
47.8
1.2
<1
<1
74/09/04
1035
tf
13.0
7.2
60
5.7
0.30
0.014
0.011
0.013
0.001
45.8
1.0
-
_
74/09/05
0950
M
12.0
7.4
56
5.1
0.19
0.019
0.016
0.011
0.003
47.8
0.9
-
_
74/09/06
1000
M
11.0
6.9
60
4.2
0.22
0.020
0.012
0.005
0.003
45.8
0.65
-
-
74/09/04
1035
B
6.5
7.1
63
5.2
0.30
0.118
0.011
0.013
0.004
54.0
1.2
-
-
74/09/05
0950
B
6.5
7.1
61
5.1
0.10
0.107
0.020
0.014
0.006
56.2
1.2
-
-
74/09/0
1000
B
6.0
6.7
66
5.1
0.19
o.m
0.015
0.013
0.007
47.8
1.5
-
-
      S =  Surface
M = Thermocl ine
B = Bottom

-------
                                               THREE  LAKES  STUDY
Station: 10
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Grand Bay
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/04
1055
S
15.0
7.7
56
7.8
0.30
<0.001
0.020
0.012
0.001
52.0
1.7
<2
<2
74/09/05
1010
S
15.0
8.2
59
8.1
0.30
0.002
0.023
0.013
0.003
45.8
1.7
<1
<-,
74/09/06
1025
S
14.5
7.8
60
7.7
0.28
0.002
0.009
0.013
0.003
45.8
1.6
<1
<1
74/09/04
1055
B
12.0
7.7
60
6.4
0.30
0.031
0.033
0.017
0.005
45.8
2.5
—

74/09/05
1010
B
7.0
7.4
66
3.7
0.76
0.125
0.034
0.027
0.010
50.0
3.7


74/09/06
1025
B
7.0
6.9
63
4.0
0.25
0.135
0.015
0.034
0.009
52.0
4.1


S = Surface
M = Thermocline;
B = Bottom

-------
                                                   THREE LAKES STUDY
Ul
Station: 13
Date
Time
Depth
Temp.
pH
Conducti vi ty
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Sunset Point
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
#/100ml
#/100ml
74/09/09
0950
S
13.5
7.5
60
7.6
0.26
0.001
0.017
0.012
0.001
43.6
1.2
1
<1
74/09/10
0900
S
13.5
8.0
58
7.4
0.27
0.002
0.016
0.018
0.002
47.8
1.4
<1
<1
74/09/11
0845
S
13.0
7.5
62
7.4
0.15
0.002
0.017
0.009
0.001
47.8
1.4
<1
<1
74/09/09
0950
B
13.5
7.1
59
7.2
0.24
0.001
0.018
0.029
0.002
45.8
1.7
-
-
74/09/10
0900
B
13.0
7.5
60
7.3
0.32
0.002
0.016
0.020
0.003
50.0
2.0
-
-
74/09/1 1
0845
B
13.0
7.1
61
7.5
0.24
0.002
0.017
0.010
0.001
45.8
1.4
-
-
      S  =  Surface
M = Thermocline
B = Bottom

-------
                                                THREE  LAKES  STUDY
Station: 14
Date
Time
Depth
Temp.
PH
Conductivity
g DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at Sunset Point
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/ 100ml
74/09/09
1005
S
14.0
7.4
60
7.6
0.21
0.001
0.013
0.012
0.001
45.8
1.3
<1
<1
74/09/10
0910
S
13.5
7.7
60
7.7
0.34
0.002
0.015
0.014
0.002
47.8
1.4
<1

-------
                                             THREE LAKES STUDY
Stati on : 15
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Sunset Point
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
nig/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/09
1015
S
14.5
7.6
60
7.7
0.10
0.002
0.018
0.011
0.001
47.8
1.3
<1
<1
74/09/10
0930
S
13.5
7.9
61
7.8
0.24
0.004
0.016
0.013
0.002
47.8
1.3
<1
<1
74/09/11
0930
S
14.0
8.0
60
7.7
0.43
0.003
0.016
0.008
<0.001
47.8
1.3
<1
<1
74/09/09
1015
B
14.5
7.2
58
7.8
0.19
0.002
0.020
0.026
0.002
50.0
2.4
-
-
74/09/10
0930
B
13.5
7.4
60
7.8
0.24
0.002
0.016
0.022
0.003
47.8
2.0
-
-
74/09/11
0930
B
14.0
7.5
60
7.8
0.52
0.002
0.020
0.014
0.001
47.8
1.5
-
-
S = Surface
M = Thermocline
B = Bottom

-------
                                                     THREE LAKES STUDY
00
Station: 16
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortbo-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Rainbow Bay
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/100ml
74/09/09
0935
S
13.0
7.6
60
7.2
0.22
0.002
0.015
0.016
0.001
47.8
2.0
<1
<]
74/09/10.
0840
S
13.0
7.8
60
7.6
0.21
0.003
0.013
0.008
0.003
47.8
1.4
<1
<-,
74/09/1 1
0830
S
13.0
7.7
61
7.7
0.46
0.002
0.020
0.010
<0.001
47.8
1.6
2
<-,
74/09/09
0935
M
13.0
7.1
60
7.3
0.22
0.002
0.021
0.013
0.001
45.8
1.5
-
_
                                                74/09/10  74/09/11  74/09/09
                                                  0840      0830      0935
                                                    M         M         B
                                                  13.5      13.0       7.5
                                                   7.4       7.4       6.9
                                                   58        61        62
                                                   7.3       7.6       4.1
                                                  0.30      0.18      0.18
                                                  0.003     0.002     0.100
                                                  0.014     0.018     0.026
                                                  0.013     0.010     0.023
                                                  0.003    <0.001     0.006
                                                  52.0      45.8      47.8
                                                   1.4       1.3       3.9
                                                         74/09/10  74/09/11
                                                           0840      0830
                                                             B         B
                                                            8.0       7.0
                                                            7.2       7.1
                                                            62        64
                                                            4.1      <4.1
                                                           0.22      0.28
                                                           0.098     0.095
                                                           0.016     0.021
                                                           0.018     0.027
                                                           0.007     0.006
                                                           47.8      47.8
                                                            3.0       3.6
    S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
10
Station: 17
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect at Kokanee Bay
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/i
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
74/09/09
0930
S
13.0
7.4
60
7.4
0.22
0.003
0.028
0.013
0.001
45.8
1.3
5
<1
74/09/10
0830
S
13.5
7.9
60
7.8
0.30
0.004
0.016
0.018
0.003
47.8
1.4
1
1
74/09/11
0825
S
13.0
7.2
61
7.7
0.62
0.002
0.019
0.013
<0.001
45.8
1.6
<1
<1
      S = Surface

-------
                                             THREE LAKES STUDY
Station: 18
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Between Kokanee and Fish Bays
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/09
0920
S
13.5
7.5
58
7.7
0.14
0.002
0.024
0.012
0.001
47.8
1.6
46
35
74/09/10
0825
S
13.5
8.0
61
7.8
0.27
0.004
0.016
0.012
0.003
47.8
1.6
2
2
74/09/11
0815
S
13.0
7.9
62
7.6
0.38
0.002
0.018
0.012
<0.001
45.8
1.7
2
2
74/09/09
0920
B
13.0
7.4
60
7.6
0.08
0.002
0.015
0.014
0.001
47.8
1.5
-
M
74/09/10
0825
B
13.0
7.8
61
7.8
0.30
0.002
0.020
0.022
0.002
47.8
1.6
-

74/09/11
0815
B
13.0
7.8
61
7.6
0.24
0.001
0.018
0.010
0.001
47.8
1.6
-

S = Surface
M = Thermocline
B = Bottom

-------
THREE LAKES STUDY
Station: 19
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
S = Surface
Lake Granby - Transect Fish
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
M = Thermocline
74/09/09
0910
S
13.0
7.7
56
7.6
0.32
0.002
0.021
0.014
0.001
47.8
1.5
14
13
B =
Bay to Rainbow
74/09/10
0815
S
13.5
8.0
61
7.8
0.26
0.003
0.021
0.012
0.002
47.8
1.8
5
2
Bottom
Island
74/09/11
0805
S
13.0
7.7
63
7.6
0.52
0.002
0.22
0.012
0.001
47.8
1.8
<1
<1


74/09/09
0910
B
14.0
7.3
56
7.6
0.21
0.002
0.020
0.014
0.002
47.8
1.4
-
-


74/09/10
0815
B
14.0
7.7
60
7.9
0.24
0.002
0.016
0.015
0.002
47.8
2.0
-
-


74/09/1 1
0805
B
13.0
7.7
61
7.5
0.43
0.002
0.017
0.014
0.001
45.8
2.3
-
-


-------
                                                    THREE LAKES STUDY
ro
Station: 20
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby - Transect Fish Bay to Rainbow
Yr/Mo/Day
Mtly.

Cent.
SU
vi mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
i/IOOml
#/100ml
74/09/09
1040
S
15.0
7.4
58
7.8
0.30
0.003
0.023
0.014
0.002
47.8
1.8
<1
<1
74/09/10
1020
S
15.0
7.8
59
7.9
0.26
0.003
0.019
0.011
0.001
64.4
1.6
<1
<-!
Island
74/09/11
0950
S
15.0
7.5
61
7.6
0.34
0.003
0.018
0.010
0.001
47.8
1.6
<1
^i

74/09/09
1040
B
14.0
7.1
61
7.3
1.00
0.004
0.033
0.154
0.010
47.8
4.2
_


74/09/10
1020
B
15.0
7.5
59
7.3
0.24
0.003
0.019
0.015
0.002
47.8
1.5
—


74/09/11
0950
B
14.0
7.1
60
7.2
0.66
0.003
0.018
0.015
0.004
47.8
1.4
—

      S = Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
•-J
CO
Station: 21
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02tN03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. CoTi.
F. Coli.
Lake Granby - Transect Fish Bay to Rainbow
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/09
1030
S
14.5
7.2
61
7.8
0.21
0.001
0.024
0.016
0.003
47.8
2.2
<1
<1
74/09/10
1015
S
15.0
7.8
59
7.8
0.30
0.003
0.018
0.015
0.003
47.8
1.9
<1
<1
Island
74/09/11
0940
S
15.0
7.9
58
7.5
0.28
0.004
0.019
0.011
0.003
45.8
1.6
<1
<1

74/09/09
1030
B
14.0
7.2
61
7.5
0.32
0.003
0.022
0.040
0.005
47.8
3.4
-
-

74/09/10
1015
B
15.0
7.4
60
7.5
0.46
0.004
0.020
0.026
0.005
47.8
2.7
-
-

74/09/11
0940
B
14.5
7.3
60
7.4
0.52
0.002
0.031
0.021
0.004
47.8
1.9
-
-
      S  =  Surface
M = Thermocline
B = Bottom

-------
                                              THREE LAKES STUDY
Station: 22
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby at
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
Campground
74/09/09
1105
S
15.0
7.6
60
7.6
0.18
0.002
0.025
0.010
0.002
47.8
2.6
2
2
Launch Area
74/09/10
1045
S
15.5
7.8
59
7.8
0.33
0.003
0.018
0.014
0.003
50.0
1.8
1
1

74/09/11
1020
S
15.5
7.9
58
7.6
0.38
0.002
0.021
0.012
0.003
47.8
1.7
3
1
S = Surface

-------
                                                    THREE LAKES STUDY
01
Station: 23
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Lake Granby at
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
Cutthroat Trout Bay
74/09/09
1050
S
15.0
7.6
62
7.8
0.22
0.002
0.022
0.018
0.003
47.8
1.8
4
4
74/09/10
1030
S
15.0
7.6
60
7.7
0.32
0.003
0.019
0.010
0.004
47.8
1.8
22
12
74/09/11
1005
S
15.0
7.7
61
7.4
0.26
0.002
0.023
0.016
0.004
47.8
2.0
13
5
74/09/09
1050
B
14.5
7.5
61
7.3
0.32
0.002
0.021
0.027
0.004
47.8
2.3
-
-
74/09/10
1030
B
15.0
7.3
60
7.1
0.30
0.003
0.022
0.018
0.005
47.8
2.4
-
-
74/09/11
1005
B
14.0
7.5
61
6.9
0.21
0.003
0.017
0.015
0.004
45.8
1.8
~
-
           Surface
M = Thermocline
                                             B = Bottom

-------
                                                     THREE LAKES STUDY
01
Station: 27
Date
Time
Depth
Temp
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt.
Yr/Mo/D
Mtly.
Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
                                        Transect  at South  End of Lake
                                        74/09/12       74/09/13      74/09/16
 0825
   S
  7.0
  7.4
  63
  7.2
 0.24
 0.031
 0.021
 0.016
 0.004
47.8

 1.8
  3
0830
   S
  7.5
  7.2
  63
  7.0
0.31
0.023
0.029
0.014
0.004
64.4
 2.1
 15
 1000
   S
  9.0
  7.4
  62
  7.9
 0.18
 0.007
 0.024
 0.015
<0.001
 56.2
  1.8
   2
      S = Surface

-------
                                             THREE LAKES STUDY
Station: 28
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
I/I 00ml
#/100ml
- Transect at
74/09/12
0815
S
7.0
7.5
64
6.8
0.34
0.046
0.022
0.015
0.003
52.0
1.6
6
2
South End of
74/09/1 3
0820
S
6.5
7.1
64
6.7
0.72
0.049
0.053
0.073
0.048
72.0
2.1
2
<2
Lake
74/09/16
0955
S
8.0
7.1
63
6.4
0.18
0.028
0.026
0.016
<0.001
56.2
1.8
2
<1

74/09/12
0815
B
7.0
7.3
64
6.7
0.25
0.045
0.020
0.014
0.003
50.0
1.6
-
-

74/09/13
0820
B
7.0
7.2
63
6.2
0.23
0.053
0.025
0.013
0.004
54.0
1.9
-
-

74/09/16
0955
B
8.0
7.3
62
6.3
0.22
0.053
0.027
0.019
0.001
50.0
2.0
-
-
S = Surface
M = Thermocline
B = Bottom

-------
                                                  THREE LAKES STUDY
00
Station: 29
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Shadow Mt. Lake
Yr/Mo/.Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- Transect at
74/9/12
0810
S
7.0
7.5
64
7.1
0.26
0.047
0.021
0.015
0.004
50.0
1.6
16
8
South End of
74/9/13
0815
S
6.5
7.3
68
6.6
0.30
0.049
0.038
0.013
0.004
50.0
2.1
5
1
Lake
74/9/16
0950
S
8.0
7.2
61
7.6
0.17
0.046
0.029
0.014
<0.001
54.0
1.9
<1
<1
     S =  Surface

-------
THREE LAKES STUDY
Station: 32 Shadow Mt. Lake
Date
Time
Depth
Temp
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Cl2-Residua1
Alkalinity
Turbidity
T Coli
F Coli
S = Surface
Yr/Mo/Day
Mtly

Cent
SU
pmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
*/ 100ml
*/ 100ml

- Transect at
74/9/12
0850
S
9.0
7.8
68
7.9
0.26
0.003
0.018
0.018
0.004
-
54.0
2.5
8
<2

North Side of
74/9/13
0855
S
8.5
7.4
73
8.5
0.18
0.001
0.031
0.014
0.003
-
66.6
2.2
22
8

Islands
74/9/16
1025
S
10.0
8.3
66
8.8
0.22
<0.001
0.027
0.026
<0.001
-
64.4
2.0
2
1


-------
                                                    THREE  LAKES  STUDY
00
o
Station: 33 Shadow Mt. Lake
Date
Time
Depth
Temp
PH
Conductivity
DO
TKN
NOg+NOa-N
NH3-N
Total -P
Ortho-P
Cl2-Residual
Alkalinity
Turbidity
T Coli
F Coli
Yr/Mo/Day
Mtly

Cent
SU
u mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
- Transect at North Side of Islands
74/9/12
0840
S
9.0
7.7
66
7.8
0.24
0.008
0.021
0.015
0.002
-
54.0
2.0
<1
<1
74/9/13
0845
S
9.0
7.0
64
7.9
0.26
0.001
0.031
0.016
0.002
-
47.8
2.1
3
<1
74/9/16
1015
S
10.0
7.1
63
8.2
0.18
<0.001
0.028
0.014
<0.001
-
87.0
2.0
<2
<2
74/9/12
0840
B
9.0
7.7
66
7.5
0.22
0.012
0.024
0.017
0.003
-
50.0
1.8
-
.
74/9/13
0845
B
9.0
7.2
64
7.8
0.28
0.001
0.034
0.020
0.003
-
60.4
2.1
-

74/9/16
1015
B
9.5
7.1
66
8.1
0.25
0.005
0.030
0.019
0.002
-
54.0
2.1
_

      S = Surface
M = Thermocline
B = Bottom

-------
                                                   THREE LAKES STUDY
oo
Station: 34 Shadow Mt. Lake
Date
Time
Depth
Temp
PH
Conductivity
DO
TKN
N02+N03-N
NHa-N
Total -P
Ortho-P
Cl2-Residual
Alkalinity
Turbidity
T Coli
F Coli
Yr/Mo/Day
Mtly

Cent
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- Transect at North Side of Islands
74/9/12
0835
S
8.0
7.5
66
7.4
0.20
0.016
0.020
0.015
0.003
-
60.4
1.6
1
<1
74/9/13
0840
S
9.0
7.6
64
8.0
0.32
0.001
0.030
0.018
0.003
-
56.2
2.1
8
<1
74/9/16
1010
S
10.0
7.6
66
8.5
0.28
<0.001
0.028
0.017
0.001
-
60.4
2.0
<1
<1
      S = Surface

-------
                                                     THREE  LAKES  STUDY
00
ro
Station: 35 Shadow Mt. Lake
Date
Time
Depth
Temp
PH
Conductivity
00
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2-Residual
Alkalinity
Turbidity
T Coli
F Coli
Yr/Mo/Day
Mtly

Cent
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- At Boat Docks West Side of Lake
74/9/12
0855
S
9.0
7.7
66
7.0
0.26
0.003
0.026
0.020
0.005
-
50.0
2.8
9
1
74/9/13
0900
S
9.0
7.3
64
7.6
0.22
0.001
0.031
0.016
0.003
-
52.0
2.3
13
<1
74/9/16
1030
S
10.5
7.7
62
8.3
0.20
0.001
0.029
0.018
0.002
_
52.0
2.3
<1
<1
          Surface

-------
                                                     THREE LAKES STUDY
00
CO
Station: 36 Shadow Mt. Lake
Date
Time
Depth
Temp
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2-Residual
Alkalinity
Turbidity
T Coli
F Coli
S = Surface
Yr/Mo/Day
Mtly

Cent
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml

- Transect at Center of Lake
74/9/12
0905
S
9.5
7.5
64
7.6
0.25
0.004
0.019
0.017
0.002
-
58.2
2.0
4
<1

74/9/13
0910
S
9.5
7.5
64
7.9
0.28
0.001
0.033
0.013
0.002
-
71.0
2.3
8
<2

74/9/16
1040
S
10.5
7.5
64
8.3
0.24
<0.001
0.023
0.017
0.001
-
71.0
2.1
<1
<1


-------
                                             THREE  LAKES  STUDY




Station:  37  Shadow Mt.  Lake - Transect at Center  of  Lake
Date
Time
Depth
Temp
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2-Residual
Alkalinity
Turbidity
T Coli
F Coli
S = Surface
Yr/Mo/Day
Mtly

Cent
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#100/ml
M = Thermocline
74/9/12
0915
S
9.5
7.1
64
7.6
0.24
0.006
0.023
0.017
0.002
-
52.0
1.8
2
<1
B =
74/9/13
0915
S
9.0
7.4
64
8.0
0.27
0.002
0.029
0.013
0.001
-
62.4
2.0
<1
<1
Bottom
74/9/16
1045
S
10.0
7.3
63
8.1
0.24
0.001
0.027
0.021
0.001
-
52.0
1.6
<1
<1

74/9/12
0915
B
9.5
7.3
64
8.0
0.24
0.006
0.022
0.017
0.001
-
52.0
2.0
-
_

74/9/13
0915
B
9.5
7.3
63
7.9
0.30
0.003
0.028
0.014
0.002
-
56.2
2.1
_
—

74/9/16
1045
B
9.5
7.0
63
8.3
0.29
<0.001
0.027
0.006
0.001
_
50.0
1.8
—
.


-------
                                                     THREE LAKES STUDY
00
tn
Station: 38 Shadow Mt. Lake
Date
Time
Depth
Temp
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Cl2-Residual
Alkalinity
Turbidity
T Coli
F Coli
S = Surface
Yr/Mo/Day
Mtly

Cent
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU x
#/100ml
#/ 100ml

- Transect at Center of Lake
74/9/12
0920
S
9.0
7.6
64
8.0
0.22
0.002
0.020
0.015
0.001
-
52.0
1.8
6
<1

74/9/13
0930
S
9.0
7.3
64
7.8
0.30
0.004
0.026
0.013
0.002
-
67.0
1.9
3
<1

74/9/16
1050
S
10.0
7.8
64
8.3
0.18
<0.001
0.025
0.015
0.001
'
52.0
1.8
1
<1


-------
CD
THREE LAKES STUDY
Station: 39 Shadow Mt. Lake
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- At Boat Docks West Side
74/9/12
1005
S
10.0
7.4
64
7.7
0.21
0.003
0.018
0.017
0.002
60.4
1.8
<1

-------
                                                   THREE LAKES STUDY
oo
Station:  40  Shadow Mt. Lake
Date              Yr/Mo/Day
Time              Mtly.
Depth
Temp.             Cent.
pH                SU
Conducti vi ty      ymhos
DO                mg/1
TKN               mg/1
N02+N03-N         mg/1
NH3-N             mg/1
Total-P           mg/1
Ortho-P           mg/1
Alkalinity        mg/1
Turbidity         JTU
T. Coli.          #/100ml
F. Coli.          #/100ml
Transect at North End of Lake
74/9/12      74/9/13       74/9/16
 0955         0950          1105
   S            S             S
 10.5         10.0          10.0
  7.7          7.7           7.2
 64           63            66
  7.8          7.9           7.6
 0.25         0.32          0.35
 0.003        0.001          0.002
 0.018        0.026         0.024
 0.018        0.015         0.018
 0.001        0.002         0.003
 54.0         56.2          5-2.0
  2.0          2.1           2.5
  6           13            19
  5            2            10
     S = Surface

-------
                                              THREE LAKES STUDY
Station: 41 Shadow Mt. Lake
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- Transect at North End of Lake
74/9/12
0950
S
10.0
7.6
64
8.0
0.22
0.003
0.018
0.016
0.001
47.8
1.6
<1
<1
74/9/1 3
0940
S
10.0
8.0
63
8.0
0.28
0.002
0.028
0.014
0.001
74.8
2.1
7
1
74/9/16
1100
S
10.0
7.6
63
8.0
0.35
<0.001
0.028
0.016
0.002
50.0
1.8
3
1
S = Surface

-------
                                                  THREE LAKES STUDY
CO
VO
Station: 42 Shadow Mt. Lake
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NHa-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Yr/Mo/Day
Mtly.

Cent.
SU
y mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
- Transect at North End of Lake
74/9/12
0945
S
10.0
8.5
66
8.0
0.24
0.003
0.018
0.017
0.001
50.0
1.7
6
<1
74/9/13
0935
S
10.0
8.9
64
9.1
0.22
0.001
0.027
0.016
0.001
54.0
1.6
43
3
74/9/16
1055
S
10.5
8.9
63
8.3
0.19
0.001
0.023
0.017
0.002
62.4
1.5
6
<1
    S =  Surface

-------
                                               THREE  LAKES STUDY
Station: 45
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake at
Yr/Mo/Day
Mtly.

Cent.
SU
vimhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
Outlet Between
74/09/17
0905
S
8.5
7.7
66
8iO
0.20
<0.001
0.024
0.008
0.003
52.0
1.5
17
1
Lakes
74/09/18
0855
S
9.0
7.5
67
8.0
0.36
0.002
0.032
0.014
0.005
52.0
2.4
15
3

74/09/19
0845
S
9.0
7.6
67
8.1
0.40
0.004
0.038
0.010
0.001
47.8
2.3
1
1
S = Surface

-------
                                         THREE LAKES STUDY
Station: 46
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at West
Yr/Mo/Day
Mtly.

Cent.
SU
pmhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/ 100ml
#/ 100ml
74/09/17
0915
S
10.0
7.8
59
8.2
0.22
<0.001
0.025
0.009
0.002
43.6
1.5
6
2
End of Lake
74/9/18
0900
S
10.0
7.7
60
8.1
0.31
0.003
0.027
0.008
0.003
57. 8
1.4
1
<1

74/09/19
0850
S
10.5
7.7
49
8.1
0.31
0.001
0.029
0.005
0.001
43.6
1.6
4
1

74/09/17
0915
B
9.5
7.8
59
8.1
0.29
<0.001
0.026
0.012
0.003
43.6
1.7
-
-

74/09/18
0900
B
10.0
7.3
60
8.1
0.38
0.002
0.016
0.012
0.003
47.8
1.7
-
-

74/09/19
0850
B
10.0
7.6
59
8.0
0.97
0.001
0.035
0.061
0.006
43.6
3.1
-
-
Surface
M = Thermocline
B = Bottom

-------
to
r\>
                                                    THREE LAKES STUDY




    Station:  47   Grand Lake - Transect at West End of Lake



    Date          Yr/Mo/Day  74/09/17  74/09/18  74/09/19  74/09/17  74/09/18  74/09/19  74/09/17
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
0920
S
10.0
7.6
54
7.9
0.20
<0.001
0.027
0.006
0.001
41.6
0.75
3
1
0905
S
10.0
7.4
58
8.3
0.32
0.001
0.027
0.006
0.002
43.6
1.3
1
1
0855
S
10.5
7.9
56
8.3
0.33
0.001
0.029
0.005
0.002
43.6
1.5
2
<1
0920
M M
6.0
6.8
33
7.1 %
CO
0.10 |
p—
0.039
0.040
0.004
0.002
25.0
0.55
-
—
0920
M B
5.5
6.9
34
§ 7.1
CO
1 0.18
r™"
m
0.051
0.028
0.014
0.003
27.0
1.4
_

0905
B
7.5
6.9
32
6.7
0.24
0.026
0.036
0.004
0.003
25.0
0.55
_

0855
B
6.0
7.2
36
7.2
0.20
0.058
0.031
0.003
0.002
27.0
1.1
—

    S =  Surface
M = Thermocline
B = Bottom

-------
                                                     THREE LAKES STUDY
10
GJ
Station: 48
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at West
Yr/Mo/Day
Mtly.

Cent.
SU
u mhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/1 7
0930
S
10.0
7.4
56
7.8
0.20
0.001
0.027
0.004
0.001
45.8
0.8
8
2
End of Lake
74/09/18
0910
S
10.0
7.3
50
8.0
0.45
0.001
0.033
0.008
0.003
43.6
1.4
1
1

74/09/19
0905
S
10.5
7.4
56
8.2
0.22
0.001
0.027
0.003
0.001
43.6
1.2
<1
<1

74/09/17
0930
B
10.0
7.1
56
8.0
0.24
0.001
0.025
0.010
0.003
43.6
1.4
-
-

74/09/18
0910
B
10.0
7.3
53
7.5
0.34
0.002
0.030
0.011
0.002
21.6
0.85
-
-

74/09/19
0905
B
10.5
7.5
56
8.2
0.49
0.005
0.032
0.019
0.002
41.6
2.2
-
-
        S =  Surface
M = Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
VO
Station: 49
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at Center of Lake
Yr/Mo/Day
Mtly.

Cent.
SU
vemhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/17
1015
S
10.0
7.3
59
8.1
0.25
<0.001
0.027
0.006
0.001
43.6
1.4
1
1
74/09/18
1025
S
12.0
7.6
56
8.2
0.27
0.001
0.029
0.010
0.002
45. 8
1.4
<1
<1
74/09/19
0945
S
10.5
7.6
59
8.2
0.24
0.001
0.028
0.004
<0.001
.43.6
1.6
<1
<1
74/09/17
1015
B
10.0
7.0
59
7.9
0.16
0.001
0.030
0.007
0.003
41.6
1.5
-

74/09/18
1025
B
11.0
7.3
56
7.6
0.27
0.003
0.030
0.011
0.003
43.6
1.5
_

74/09/19
0945
B
11.0
7.5
60
8.3
0.30
0.001
0.032
0.007
0.001
45.8
1.3
_

          Surface
M = Thermocline
B = Bottom

-------
vo
en
                                                     THREE LAKES STUDY




     Station:   50   Grand  Lake  -  Transect at  Center of Lake


     Date           Yr/Mo/Day 74/09/17  74/09/18  74/09/19  74/09/17  74/09/18  74/09/19  74/09/17  74/09/18  74/09/19
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Mtly.

Cent.
SU
ymhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
1000
S
10.0
7.3
47
8.1
0.23
0.001
0.027
0.003
0.001
43.6
1.2
3
1
1010
S
12.0
7.1
56
8.1
0.34
0.001
0.023
0.007
0.001
43.6
0.9
<1
<1
0930
S
10.5
7.2
60
8.3
0.30
0.001
0.031
0.004
<0.001
43.6
1.4
1
1
1000
M
7.0
7.0
31
6.9
0.10
0.020
0.032
0.002
0.002
25.0
0.6
-
_
1010
M
9.0
6.9
32
6.8
0.20
0.018
0.032
0.004
0.002
20.8
0.5
-
_
0930
M
7.5
6.7
33
6.9
0.23
0.024
0.032
0.001
<0.001
22.8
0.53
-
_
1000
B
4.0
6.7
56
3.5
0.11
0.209
0.028
0.001
0.001
41.6
0.75
-
_
1010
B
4.0
6.9
56
3.1
0.26
0.216
0.035
0.018
0.005
41.6
3.5
-
_
0930
B
4.0
6.6
56
1.7
0.25
0.253
0.058
0.001
<0.001
41.6
2.5
-
_
    S = Surface
M - Thermocline
B = Bottom

-------
                                                    THREE LAKES STUDY
vo
Station: 51
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at Center of Lake
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/17
0955
S
10.0
7.2
56
8.0
0.14
0.001
0.031
0.004
0.001
41.6
1.2
7
5
74/09/18
1005
S
12.0
7.8
53
8.3
0.22
0.001
0.037
0.005
0.001
43.6
1.2
<1
<1
74/09/19
0925
S
10.5
7.7
56
8.3
0.26
0.002
0.032
0.003
<0.001
45.8
1.3
<1

-------
                                                     THREE LAKES STUDY
<£>
Station: 53
Date
Time
Depth
Temp.
pH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total-P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at East
Yr/Mo/Day
Mtly.

Cent.
SU
vi mhos
mg/1
mg/1
mg/1
mq/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/17
1025
S
11.5
7.8
56
8.1
0.24
0.001
0.028
0.006
0.003
41.6
1.5
6
5
74/09/18
1030
S
12.0
7.7
56
8.4
0.24
0.001
0.029
-
0.002
45.8
1.4
<1
<1
End of Lake
74/09/19
0950
S
10.5
7.8
45
8.2
0.24
0.002
0.033
0.004
<0.001
45.8
1.2
<1
<1
74/09/17
1025
M
8.0
6.7
32
6.5
0.19
0.014
0.026
0.002
0.001
25.0
0.4
-
_
74/09/18
1030
M
8.0
7.1
32
7.1
0.12
0.031
0.033
0.003
0.002
22.8
0.5
-
-
74/09/19
0950
M
7.0
7.0
34
6.8
0.18
0.031
0.034
0.001
0.001
25.0
0.64
-
-
74/09/17
1025
B
6.0
6.9
34
7.2
0.25
0.053
0.031
0.028
0.003
27.0
1.3
-
-
74/09/18
1030
B
7.0
7.1
36
7.3
0.14
0.061
0.029
0.005
0.002
29.2
1.0
-
-
74/09/1'
0950
B
6.0
6.8
36
7.3
0.22
0.057
0.035
0.002
0.001
35.4
0.55
-
-
    S = Surface
M = Thermocline
B = Bottom

-------
10
oo
                                                     THREE  LAKES  STUDY



     Station:   54    Grand  Lake  - Transect at  East  End of Lake


     Date           Yr/Mo/Day  74/09/17  74/09/18   74/09/19  74/09/17  74/09/18  74/09/19   74/09/17  74/09/18  74/09/19
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NHa-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
1035
S
11.0
7.3
56
8.0
0.18
0.001
0.028
0.004
0.001
47.8
0.9
5
4
1040
S
12.5
7.8
56
8.1
0.24
0.001
0.032
0.006
0.002
45.8
1.3
1
1
1000
S
11.0
7.9
56
8.5
0.32
0.002
0.031
0.004
0.001
43.6
1.4
<1
<1
1035
M
8.0
6.9
32
6.9
0.10
0.023
0.035
0.002
0.002
27.0
0.4
-
—
1040
M
8.0
7.1
32
7.1
0.19
0.032
0.038
0.003
0.001
25.0
0.5
-

1000
M
7.5
6.9
32
7.0
0.32
0.025
0.033
0.001
0.001
27.0
0.50
_

1035
B
4.5
6.8
52
6.0
0.22
0.114
0.031
0.006
0.003
39.6
1.1
w

1040
B
4.5
7.0
54
6.1
0.20
0.116
0.036
0.002
0.002
41.6
0.85
—

1000
B
4.0
6.9
49
6.2
0.22
0.122
0.032
0.001
0.001
39.6
0.6
_

    S = Surface
M = Thermo dine
B = Bottom

-------
                                                     THREE LAKES STUDY
vo
Station: 55
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
Grand Lake - Transect at East
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
JTU
#/100ml
#/100ml
74/09/17
1045
S
12.0
7.2
53
7.9
0.16
0.002
0.027
0.004
0.001
43.6
1.1
2
2
End of Lake
74/09/18
1050
S
12.0
7.6
56
8.2
0.29
0.001
0.034
0.005
0.001
43.6
0.9
2
<1

74/09/19
1015
S
11.0
7.9
56
8.3
0.27
0.001
0.029
0.006
0.001
43.6
1.6
2
1

74/09/17
1045
B
10.5
7.2
51
7.2
0.10
0.003
0.028
0.006
0.002
41.6
1.1
-
-

74/09/18
1050
B
11.5
7.5
56
8.2
0.28
0.002
0.031
0.009
0.003
41.6
0.9
-
-

74/09/19
1015
B
6.0
7.1
34
7.2
0.16
0.052
0.033
0.003
0.001
25.0
0.65
-
-
      S = Surface
M = Thermocline
B = Bottom

-------
                                                     THREE  LAKES STUDY
o
o
Station: 56
Date
Time
Depth
Temp.
PH
Conductivity
DO
TKN
N02+N03-N
NH3-N
Total -P
Ortho-P
Alkalinity
Turbidity
T. Coli.
F. Coli.
S = Surface
Grand Lake - Inlet to Adams Tunnel
Yr/Mo/Day
Mtly.

Cent.
SU
umhos
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
rag/1
JTU
#/100ml
#/ 100ml
M = Thermocline
74/09/17
1055
S
12.0
7.3
52
8.0
0.18
0.003
0.028
0.004
0.002
43.6
0,9
<1
<1
B =
74/09/18
1100
S
12.0
7.3
56
8.2
0.26
0.001
0.030
0.002
0.001
41.6
1.1
2
2
Bottom
74/09/19
1020
S
12.0
7.7
54
8.3
0.35
0.002
0.030
0.006
0.001
43.6
1.7
1
1

74/09/17
1055
B
10.5
7.4
56
8.0
0.18
0.002
0.031
0.006
0.003
47.8
1.2
-
-

74/09/18
1100
B
11.5
7.3
56
8.2
0.34
0.001
0.031
0.006
0.002
43.6"
1.4
-
-

74/09/19
1020
B
11.0
7.6
56
8.1
0.32
0.002
0.031
0.010
0.001
43.6
1.6
-
-


-------
                    APPENDIX B





CROSS-SECTIONS, GRAND, SHADOW MOUNTAIN, GRANBY LAKES
                        201

-------
           Lake Granby, Cross-Section at Twin  Pines  Point.
ro
o
ro
      CD
      
-------
           Lake Granby, Cross-Section at  Rocky  Point.
ro
o
             0_


             0
          20
2000
_1  Kilometer


      4000
6000
8000
10,000
12,000 feet

-------
           Lake Granby at Grand Bay.
ro
o
                                     1  Kilometer


                                          4000
6000
8000
10,000
  i
12,000 feet

-------
           Lake  Granby Cross-Section at  Sunset  Point.
               0
1 Kilometer
                            2000
     4000
6000
8000
10,000
no
o
en
12,000 feet

-------
            Lake Granby., Cross-Section  Fish Bay  to  Rainbow  Island,
              0
ro
CD
eft
 20



 40



 60



 80



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                                4000
6000
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Shadow Mountain Lake,  Cross-Section at South End of Lake.

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160
180
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0 1 Kilometer
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Shadow Mountain Lake. Cross-Section at North  Side  of  Islands.
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40
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OT
160
180
200
220
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Shadow Mountain Lake,  Cross-Section  at  Center of Lake.
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10 100
120
£ 140
160
180
200
2?0
240
260
1 Kilometer
2000 4000 6000 8000 10,000 12,000 feet
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Shadow Mountain Lake,  Cross-Section at  North End of Lake.
0
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 60



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100




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140



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     40
                         1 Kilometer
               2000
                            4000
                         6000
                                                             8000
10,000
12,000 feet
         41
42

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           Grand  Lake, Cross-Section at West End of Lake.
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             0
          1 Kilometer
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         160


         180


         200


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2000
4000
6000
8000
10,000
12,000 feet

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            Grand Lake, Cross-Section at Center of Lake.
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                                          4000
6000
8000
10,000
12,000 feet

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            Grand Lake,  Cross-Section at East End of Lake.
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              0

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           20
      
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APPENDIX C



REFERENCES
  214

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                                REFERENCES


American Public Health Association.   1971.  Standard Methods for the  Examination
     of Water and Wastewater.  13th  Ed.  APHA,  N.Y.

Environmental Protection Agency.   1970.   Water Quality Conditions in  Grand  Lake,
     Shadow Mountain Lake, Lake Granby.   Water Quality Office,  Pacific  South-
     West Region, San Francisco,  California.

Federal Water Pollution Control Administration.   1968.  Water Quality Criteria.
     Report of the National Technical Advisory Committee to the Secretary of
     the Interior.  U.S. Department of the Interior.

Geldreich, E.E.  1966.  Sanitary Significance of Fecal Coliforms in the Environ-
     ment.  U.S. Department of the Interior, F.W.P.C.A., Washington,  D.C.

Goldman, Charles R.  1961.  The measurement of Primary Productivity and Limiting
     Factors in Freshwater with Carbon-14.  P. 103-130.  In Proceedings of  the
     Conference on Primary Productivity Measurement, Marine and Freshwater.
     (Maxwell S. Doty ed.).  U.S.  Atomic Energy Commission, Division  of Technical
     Information.

Kugrens and Paul sen.  1972.  Phytoplankton Studies on Grand, Shadow Mountain
     and Granby Lakes.


Mundt, J.C.  1963.  Occurrence of Entrococci on Plants in a Wild Environment.
     Applied Microbiol.  11:141.

Nelson, W.C.  1971.  Comparative Limnology of Colordo-Big Thompson Project
     Reservoirs and Lakes.  Colorado Department of Game, Fish and Parks.   .
     Project No. F-25-R-1 to 4, Job No.  3.  P. 108.

Pennak, Robert W.  1955.  Comparative Limnology of Eight Colorado Mountain  Lakes.
     University of Colorado Studies, Series in Biology No.  2, University of
     Colorado Press, Boulder, Colorado.

Sawyer, C.N.  1947.  Fertilization of Lakes by Agricultural and Urban Drainage.
     J. New England Water Works Assoc.  61(2):109-127.

Shiroyama, T., W.E. Miller, and J.C. Greene.  1975.  Effects of Nitrogen and
     Phosphorus on the Growth of Selenastrum capricornutum Printz.  Proc. Bio-
     stimulation-Nutrient Assessment Workshop, Oct. 16-18,  1973.  U.S.  Environ-
     mental Protection Agency.  Corvallis, Oregon.   EPA-606/3-75-034.

U.S. Department of the Interior,  Bureau of Reclamation, 1962.  The Story of the
     Colorado-Big Thompson Project.   Bureau of Reclamation.  56 pp.
                                     215

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Weber, Cornelius I. (Ed.) 1973.  Biological  Field and Laboratory Methods
     for Measuring the Quality of Surface Waters and Effluents.   Environmental
     Protection Agency, EPA-670/4-73-001.  National  Environmental Research
     Center, Office of Research and Development, U.S.E.P.A.

Greene, J.C., R.A. Soltero, W.E. Miller,  A.F.  Gasperino, and T.  Shiroyama.
     1975.  The Relationship of Laboratory Algal Assays  to Measurements
     of Indigenous Phytoplankton in Long  Lake, Washington.  Proc. Bio-
     stimulation and Nutrient Assessment  Workshop.   Sept.  10-12, 1975.
     Utah State University, Logan, Utah.   PRWG 168-1.

Nelson, Haley, Patterson and Quirk, Inc.  1974.  Final Environmental
     Assessment Three Lakes Water and Sanitation District Master Plan.
     Environmental Planning and Management,  Inc.  Greeley, Colorado.

Nelson, Haley, Patterson and Quirk, Inc.   1972.   A regional  Water Quality
     and Sewerage Master Plan for the Three  Lakes Water  and  Sanitation District.

CNC/NHPQ, Inc. 1973.  Three Lakes Regional Planning  Study for the Three
     Lakes Region of Grand County, Colorado
                                   216

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                                    TECHNICAL REPORT DATA
                             (Please read Instructions on the reverse before completing)
  1. REPORT NO.
   EPA-9Q8/2-77-OQ2
I. TITLE AND SUBTITLE
  Water Quality Study
  Grand Lake, Shadow Mountain Lake, Lake Granby
  Colorado - 1974
                                                          3. RECIPIENT'S ACCESSION-NO.
                                                            5. REPORT DATE
                                                            6. PERFORMING ORGANIZATION CODE
  • AUTHORtS)
                                                          8. PERFORMING ORGANIZATION REPORT NO.
                                                              SA/TIB-32
 9. PERFORMING ORGANIZATION NAME AND ADDRESS
                                                            10. PROGRAM ELEMENT NO.
 Technical  Investigations  Branch
 Surveillance and Analysis  Division
 U.S.  Environmental Protection  Agency - Region VIII
 Denver,  Colorado  80295
                                                            11. CONTRACT/GRANT NO.
  12, SPONSORING AGENCY NAME AND ADDRESS
                                                            13. TYPE OF REPORT AND PERIOD COVERED
                                                            14. SPONSORING AGENCY CODE
 15. SUPPLEMENTARY NOTES
   . ABSTRACT
        To  develop additional information  on the effect of point and non-point
   sources  of  wastes and on the trophic  condition of the three lakes,  the  Technical
   Investigations  Branch, Surveillance and Analysis Division, Region VIII,  EPA
   conducted an  investigation of Grand,  Shadow Mountain, and Granby Lakes.   The
   study, conducted in June and repeated again in September, 1974, concentrated on
   1) the determination of the existing  nutrient level  in each of the  lakes;  2)  the
   determination of the existing organic and nutrient loadings from point  and non-
   point sources;  and 3) the determination  of the probable consequences of increased
   nutrient levels  in the three lakes as regards nuisance algal growths.   Sampling
   was conducted at 71  locations throughout the study area.

17. KEY WORDS AND DOCUMENT ANALYSIS
?!_ DESCRIPTORS

la- DISTRIBUTION STATEMENT
Release to the Public
b. IDENTIFIERS/OPEN ENDED TERMS

19. SECURITY CLASS (This Report)
Unclassified
20. SECURITY CLASS (This page)
Unclassified
c. COSATI Field/Group

21. NO. OF PAGES
216
22. PRICE :
EPA Form 2220-1 (9-73)

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