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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
-------
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.
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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.
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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
-------
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
-------
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
-------
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
-------
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
-------
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
-------
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
-------
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
TOO
120
S- 140
160
180
200
220
240
260
2000
1 Kilometer
4000
6000
8000
10,000
12,000 feet
-------
Shadow Mountain Lake, Cross-Section at South End of Lake.
20
40
60
80
0
100
120
-h
o>
« 140
160
180
200
220
240
260
0 1 Kilometer
0 2000 4000 6000 8000 10,000 12,000 feet
" ^\^^
>
i
-------
Shadow Mountain Lake. Cross-Section at North Side of Islands.
c
c
20
40
60
80
o
oo
100
120
S 140
OT
160
180
200
220
260
* 1 Kilometer
2000 4000 6000 8000 10,000 12 0
^ ^^^-^s_ J ' ' ' '
32 ^T"-< 34 ^
•
•
•
-------
Shadow Mountain Lake, Cross-Section at Center of Lake.
0
0
20
40
60
80
ro
0
10 100
120
£ 140
160
180
200
2?0
240
260
1 Kilometer
2000 4000 6000 8000 10,000 12,000 feet
36 37 38
-------
Shadow Mountain Lake, Cross-Section at North End of Lake.
0
0
20
40
60
80
100
120
140
160
180
200
220
240
260
40
1 Kilometer
2000
4000
6000
8000
10,000
12,000 feet
41
42
-------
Grand Lake, Cross-Section at West End of Lake.
ro
0
0
1 Kilometer
n>
2. 140
160
180
200
220
240
260
2000
4000
6000
8000
10,000
12,000 feet
-------
Grand Lake, Cross-Section at Center of Lake.
IVS
ro
1 Kilometer
4000
6000
8000
10,000
12,000 feet
-------
Grand Lake, Cross-Section at East End of Lake.
ro
CO
0
^^^
0
20
-------
APPENDIX C
REFERENCES
214
-------
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
-------
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
-------
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)
------- |