U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
ISLAND PARK ESERVOIR
FREMONT COUNTY
IDAHO
EPA REGION X .
WORKING PAPER No, 782
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
•frG.P.O. 699-440
-------
REPORT
ON
ISLAND PARK RESERVOIR
FREW COUNTY
IDAHO
EPA REGION X
WORKING PAPER No, 782
WITH THE COOPERATION OF THE
IDAHO DEPARTMENT OF HEALTH AND WELFARE
AND THE
IDAHO NATIONAL GUARD
JULY, 1977
-------
REPORT ON ISLAND PARK RESERVOIR
FREMONT COUNTY, IDAHO
EPA REGION X
by
National Eutrophication Survey
Water and Land Quality Branch
Monitoring Operations Division
Environmental Monitoring & Support Laboratory
Las Vegas, Nevada
and
Special Studies Branch
Corvallis Environmental Research Laboratory
Corvallis, Oregon
Working Paper No. 783
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
July 1977
-------
CONTENTS
Page
Foreword i i
List of Idaho Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 4
III. Lake Water Quality Summary 6
IV. Nutrient Loadings 12
V. Literature Reviewed 17
VI. Appendices 18
-------
ii
FOREWORD
The National Eutrophicatlon Survey was Initiated 1n 1972 1n
response to an Administration commitment to Investigate the nation-
wide threat of accelerated eutrophlcation to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concen-
trations, and impact on selected freshwater lakes as a basis for
formulating comprehensive and coordinated national, regional, and
state management practices relating to point source discharge
reduction and nonpolnt source pollution abatement in lake water-
sheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts
that:
a. A generalized representation or model relating
sources, concentrations, and Impacts can be
constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized
model can be transformed Into an operational
representation of a lake, its drainage basin, and
related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophlcation control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and
watershed data collected from the study lake and Its drainage
basin is documented. The report is formatted to provide state
environmental agencies with specific Information for basin
planning [§303(e)], water quality criteria/standards review
L§303(c)], clean lakes [§314(a,b)], and water quality monitoring
[§106 and §305(b)] activities mandated by the Federal Water
Pollution Control Act Amendments of 1972.
-------
111
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condition
are being made to advance the rationale and data base for refine-
ment of nutrient water quality criteria for the Nation's freshwater
lakes. Likewise, multivariate evaluations for the relationships
between land use, nutrient export, and trophic condition, by lake
class or use, are being developed to assist in the formulation of
planning guidelines and policies by the U.S. Environmental Protection
Agency and to augment plans implementation by the states.
ACKNOWLEDGMENTS
The staff of the National Eutrophication Survey (Office of
Research and Development, U.S. Environmental Protection Agency)
expresses sincere appreciation to the Idaho Department of Health
and Welfare for professional involvement, to the Idaho National
Guard for conducting the tributary sampling phase of the Survey,
and to those Idaho wastewater treatment plant operators who pro-
vided effluent samples and flow data.
The staff of the State of Idaho Department of Health and
Welfare, Division of Environment, provided invaluable lake docu-
mentation and counsel during the Survey, reviewed the preliminary
reports and provided critiques most useful in the preparation of
this Working Paper Series.
Major General James S. Brooks, Adjutant General of Idaho, and
Project Officer Major Vestal L. Baker, who directed the volunteer
efforts of the Idaho National Guardsmen, are also gratefully
acknowledged for their assistance to the Survey.
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IV
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF IDAHO
LAKE NAME
American Falls Reservoir
Cascade Reservoir
Coeur d'Alene Lake
Dworshak Reservoir
Hauser Lake
Hayden Lake
Island Park Reservoir
Lake Lowell (Deer Flat Reservoir)
Magic Reservoir
Palisades Reservoir
Payette Lake
Lower Twin Lake
Upper Twin Lake
COUNTY
Bannock, Bingham, Power
Valley
Benewah, Kootenai
Clearwater
Kootenai
Kootenai
Fremont
Canyon
Elaine, Camas
Bonneville (Lincoln in WY)
Valley
Kootenai
Kootenai
-------
ISLAND PARK RESERVOIR
Tributary Sampling Site! >^L-/
X Lake Sampling Site;
Drainage Area Boundary
ISLAND PARK
RESERVOIR
-------
REPORT.ON ISLAND PARK RESERVOIR, IDAHO
STORE! NO. 1607
I. CONCLUSIONS
A. Trophic Condition:*
On the basis of Survey data and field observations, Island
Park Reservoir is considered eutrophic, i.e., nutrient rich
and highly eutrophic. Whether such nutrient enrichment is to
be considered beneficial or deleterious is determined by its
actual or potential impact upon designated beneficial water
uses of each lake.
Chlorophyll a^ levels in the lake ranged from 0.9 yg/1 to
26.3 ug/1 with a mean of 9.3 yg/1. Potential for primary pro-
ductivity as measured by algal assay control yield was high.
The relatively high Secchi disc visibility of July sampling was
severely depressed during September. Of the 13 Idaho lakes
sampled in 1975, 3 had higher median total phosphorus levels,
8 had greater median inorganic nitrogen values and 4 had greater
median orthophosphorus levels than Island Park Reservoir.
Survey limnologists reported heavy algal blooms throughout
the lake during both September and October visits to the lake.
*See Appendix E.
-------
B. Rate-Limiting Nutrient:
The algal assay results indicate that Island Park Reservoir
was limited by available phosphorus during September sampling, and
by available nitrogen during July and October. The reservoir data
suggest primary limitation by nitrogen on all three sampling
occasions.
C. Nutrient Controllability:
1. Point sources -
During the sampling year, point sources were not found
to have contributed any of the nutrient loading to Island Park
Reservoir. Septic tanks were estimated to have contributed
0.3% of the total phosphorus load to the lake.
The calculated annual phosphorus loading to Island Park
p
Reservoir of 0.32 g P/m /yr was less than Vollenweider's (1975)
proposed oligotrophic loading for lakes with such volume and
hydraulic retention time. However, this loading rate is
probably far too low since loading calculations based upon
nutrient concentrations indicate a net export of phosphorus
and nitrogen from the lake, suggesting that sampling was not
adequate to depict actual loading and export rates. This ap-
parent export could be due to an underestimation of nutrient
loadings from the ungaged tributaries to the reservoir, to
unknown industrial or municipal point sources, or to sampling
-------
error. Additional sampling to determine the true nutrient
budget for the lake is needed before any recommendation on
nutrient controllability in Island Park Reservoir can be made.
2. Nonpoint sources -
All of the total phosphorus input to Island Park Reservoir
was found to be contributed by nonpoint sources during the
sampling year. Ungaged tributaries were estimated to have
contributed 13.2%, Henrys Fork contributed 61.3% and Sheridan
Creek contributed 7.2%. The remaining three gaged tributaries
collectively contributed a total of 12.5%.
-------
I-I. LAKE AND DRAINAGE CHARACTERISTICS
Lake and drainage basin characteristics are itemized below. Lake
morphometry data were provided by Martin and Hanson (1966). Tribu-
tary flow data were provided by the Idaho District Office of the
U.S. Geological Survey (USGS). Outlet drainage area includes the
lake surface area. Mean hydraulic retention time was obtained by
dividing the lake volume by mean flow of the outlet. Precipitation
values are estimated by methods as outlined in National Eutrophication
Survey (NES) Working Paper No. 175. A table of metric/English
conversions is included as Appendix A.
A. Lake Morphometry:
2
1. Surface area: 31.54 km .
2. Mean depth: 5.0 meters.
3. Maximum depth: 21.9 meters.
4. Volume: 156.980 x 106 m3.
5. Mean hydraulic retention time: 109 days.
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B. Tributary and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km?) (m3/sec)
A-2 Henrys Fork 676.0 9.14
B-l Hotel Creek 38.3 0.52
C-l Sheep Creek 32.4 0.08
D-l Icehouse Creek 19.7 0.56
E-l Sheridan Creek 282.3 0.85
Minor tributaries and
immediate drainage - 165.6 2.41
Totals 1,214.3 13.56
2. Outlet - A-l Henrys Fork 1,245.8 16.61
C. Precipitation:
1. Year of sampling: 34.2 cm.
2. Mean annual: 30.3 cm.
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III. LAKE WATER QUALITY SUMMARY
Island Park Reservoir was sampled three times during the
open-water season of 1975 by means of a pontoon-equipped Huey heli-
copter. Each time, samples for physical and chemical parameters
were collected from three stations on the lake and from a number
of depths at each station (see map, page v). During each visit,
depth-integrated samples were collected from each station for
chlorophyll a_ analysis and phytoplankton identification and enumera-
tion. During the first and last visits, 18.9-liter depth-integrated
samples were composited for algal assays. Maximum depths sampled
were 3.0 meters at Station 01, 14.9 meters at Station 02, and 21.0
meters at Station 03. For a more detailed explanation of NES methods,
see NES Working Paper No. 175.
The results obtained are presented in full in Appendix C and are
summarized in III-A for waters at the surface and at the maximum
depth for each site. Results of the phytoplankton counts and chloro-
phyll ^determinations are included in III-B. Results of the limiting
nutrient study are presented in III-C.
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ISLAND PA2K WESERvOIR
STO°ET CODE 1607
PARAMFTEP
TEMPE3ATUPE (OEG CFNT)
O.-l.5 M DEPTH
MAX DEPTH**
OISSOl tfED OXYGEN (MG/L)
O.-l.5 M HEPTH
MAX DEPTH**
CONDUCTIVITY (L
O.-l.5 M DEPTH
MAX DEPTH**
PH (STANDARD UNITS)
O.-l.5 M OEPTH
MAX DEPTH**
TOTAL ALKALINITY (MR/L)
O.-l.5 M DEPTH
MAX DEPTH**
TOTAL P (MG/L)
O.-l.5 M DEPTH
MAX DEPTH**
DISSOLVED ORTHO P (MG/L)
O.-l.5 M DEPTH
MAX DEPTH**
N02+N03 (MG/L)
O.-l.5 M OEPTH
MAX DEPTH**
AMMONIA (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
KjELDAHL N (MG/L)
n.-l.S M DEPTH
MAX DEPTH**
SECCHI DISC
PHYSICAL AND CHEMICAL CHARACTERISTICS
( 7/HO/75 )
s*«» = t
N* RANGE MEDIAN
6
3
)
6
3
6
3
6
3
.)
6
3
6
3
'D
6
3
ft
3
6
3
6
3
16.8- 17.8
6.3- 16.9
6.8- 9.2
2.2- 7.fl
132.- 145.
93.- 137.
9.2- 9.4
B.I- 9.3
70.- 82.
60.- 80.
0. 018-0. 02R
0.034-0.258
0.011-0.014
0.014-0.134
0.020-0.020
0.020-0.040
0.0?0-0.030
0.030-0.400
0.200-0.400
0.200-0.500
17.6
8.5
8.7
3.2
135.
105.
9.3
8.4
74.
*?.
0.0?0
0.105
0.012
0.066
0.0?0
0.0*0
0.0?B
0. 160
O.?00
0.300
MAX
DEPTH
RANGE
(METERS)
0.0- 1.5
3.0- 21.0
0.0- 1.5
3.0- 21.0
0.0- 1.5
3.0- 21.0
0.0- 1.5
3.0- 21.0
0.0- 1.5
3.0- 21.0
0.0- 1.5
3.0- 21 .0
0.0- 1.5
3.0- 21.0
0.0- 1.5
3.0- 21.0
0.0- 1.5
3.0- 21.0
0.0- 1.5
3.0- 21.0
( 9/ 3/75 )
S»»» = 3
K.* RANGE MEDIAN
5 15.0- 16.6
2 13.6- 15.0
5 5.0- 9.2
2 5.0- 5.4
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B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
07/30/75
09/03/75
10/20/75
Dominant
Genera
1. Aphanizomenon
2. Chroqmonas
3. Cryptomonas
4. Cyanophytan
5. Microcystis
Other genera
Total
1. Aphanizomenon
2. Chroomonas
3. Melosira
Other genera
Total
1. Fragilaria
2. Aphanizomenon
3. Melosira
4. Chrysophytan
5. Cryptomonas
Other genera
Total
Algal
Units
per ml
454
165
83
83
83
82
950
3,254
38
38
3,330
596
553
213
170
85
1,617
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2. Chlorophyll a_ -
Sampling Station Chlorophyll a
Date Number (yg/D
07/30/75 01 2.8
02 2.3
03 5.1
09/03/75 OT £3
03 26.3
,0/20/75 01 £9
03 2-9
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10
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked
a. 07/30/75
Ortho P
Spike (mg/1) Cone, (mg/1)
Control 0.025
0.05 P 0.075
0.05 P + 1.0 N 0.075
1.00 N 0.025
b. 09/03/75
Spike (mg/1)
Ortho P
Cone, (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
0.025
0.075
0.075
0.025
c.
10/20/75
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
Ortho P
Cone, (mg/1)
0.015
0.065
0.065
0.015
Inorganic N
Cone, (mg/1)
0.025
0.025
1.025
1.025
Inorganic N
Cone, (mg/1)
0.310
0.310
1.310
1.310
Inorganic N
Cone, (mg/1)
0.115
0.115
1.115
1.115
Maximum Yield
(mg/1-dry wt.)
3.6
3.6
13.5
9.9
Maximum Yield
(mg/1-dry wt.)
6.6
17.9
32.0
5.4
Maximum Yield
(mg/1-dry wt.)
6.0
7.4
28.4
9.3
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11
2. Discussion -
The control yields of the assay alga, Selenastrum capri-
cornutum, indicate that the potential primary productivity in Island
Park Reservoir was high during all three sampling periods. In the
July and October assays, a significant increase in yield occurred
when nitrogen was added alone and in combination with phosphorus
indicating nitrogen limitation at those times. In the September
assay, the addition of orthophosphorus alone produced a significant
increase in yield over that of the control, indicating phosphorus
limitation at that time. Note that in the September assay the
addition of nitrogen alone did not result in any increase in yield
over that of the control.
The mean inorganic nitrogen to orthophosphorus ratios (N/P)
in the lake data were less than 6/1 on all sampling occasions,
suggesting primary limitation by nitrogen on all three sampling
occasions.
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12
IV. NUTRIENT LOADINGS
(See Appendix D for data)
For the determination of nutrient loadings, the Idaho National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page v), except for the high
runoff months of May and June when two samples were collected at
some stations. Sampling was begun in October 1974, and was com-
pleted in September 1975.
Through an interagency agreement, stream flow estimates for
the year of sampling and a "normalized" or average year v/ere pro-
vided by the Idaho District Office of the USGS for the tributary
sites nearest the lake.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of a USGS computer program for
calculating stream loadings. Nutrient loads indicated for tribu-
taries are those measured minus known point source loads, if any.
Nutrient loadings for unsampled "minor tributaries and immedi-
ate drainage" ("ZZ" of USGS) were estimated by using the mean
?
annual nutrient loads, in kg/km/year, in Hotel Creek, Sheep Creek
and Sheridan Creek, at Stations B-l, C-l and E-l and multiplying
2
the means by the ZZ area in km .
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13
A. Waste Sources:
1. Known municipal - None
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
% of
Source kg P/yr total
a. Tributaries (nonpoint load) -
A-2 Henrys Fork 6,135 61.3
B-l Hotel Creek 690 6.9
C-l Sheep Creek 130 1.3
D-l Icehouse Creek 430 4.3
E-l Sheridan Creek 715 7.2
b. Minor tributaries and immediate
drainage (nonpoint load) - 1,325 13.2
c. Known municipal STP's - None
d. Septic tanks* - 30 0.3
e. Known industrial - None
f. Direct precipitation** - 550 5.5
Totals 10,005 100.0%
2. Outputs - A-l Henrys Fork 22,550
3. Net annual P export*** - 12,545
*Estimate based on 100 lakeshore residences.
**Estimated (See NES Working Paper No. 175).
***Export probably due to unknown sources and/or sampling error.
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14
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kg N/yr total
a. Tributaries (nonpoint load) -
A-2 Henrys Fork 52,870 36.8
B-l Hotel Creek 8,920 6.2
C-l Sheep Creek 1,970 1.4
D-l Icehouse Creek 8,325 5.8
E-l Sheridan Creek 17,055 11.9
b. Minor tributaries and immediate
drainage (nonpoint load) - 19,540 13.6
c. Known municipal STP's - None
d. Septic tanks* - 1,065 0.7
e. Known industrial - None
f. Direct precipitation** - 34,050 23.6
Totals 143,795 100.0%
2. Outputs - A-l Henrys Fork 459,510
3. Net annual N export*** - 315,715
*Estimate based on 100 lakeshore residences.
**Estimated (See NES Working Paper No. 175).
***Export probably due to unknown sources and/or sampling error.
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15
D. Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
2 2
Tributary kg P/km /yr kg N/km /yr
Henrys Fork 9 78
Hotel Creek 18 233
Sheep Creek 4 61
Icehouse Creek 22 423
Sheridan Creek 2 60
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16
E. Yearly Loadings:
In the following table, the existing phosphorus loading is
compared to the relationship proposed by Vollenweider (1975).
Essentially, his "eutrophic" loading is that at which the receiving
waters would become eutrophic or remain eutrophic; his "oligotrophic"
loading is that which would result in the receiving water remaining
oligotrophic or becoming oligotrophic if morphometry permitted. A
"mesotrophic" loading would be considered one between "eutrophic"
and "oligotrophic."
It should be noted that Vollenweider's model may not be appli-
cable to water bodies with very short retention times or in which
light penetration is severely restricted from high concentrations of
suspended solids in the surface waters.
Total Yearly
Phosphorus Loading
(g/m2/yr)
Estimated loading for Island Park Reservoir 0.32
Vollenweider's "eutrophic" loading 0.78
Vollenweider's "oligotrophic" loading 0.39
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17
V. LITERATURE REVIEWED
Martin, R.O.R. and Ronald L. Hanson. 1966. Reservoirs in the U.S.
Geological Survey Water Supply Paper No. 1838. U.S. Government
Printing Office, Washington, D.C.
U.S. Environmental Protection Agency. 1975. National Eutrophica-
tion Survey Methods 1973-1976. Working Paper No. 175. National
Environmental Research Center, Las Vegas, Nevada, and Pacific
Northwest Environmental Research Laboratory, Corvallis, Oregon.
Vollenweider, R. A. 1975. Input-Output Models With Special
Reference to the Phosphorus Loading Concept in Limnology.
Schweiz. Z. Hydrol. 37:53-84.
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18
VI. APPENDICES
APPENDIX A
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
Cubic meters x 8.107 x 10 = acre/feet
Square kilometers x 0.3861 - square miles
Cubic meters/sec x 35.31G = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 - pounds
Kilograms/square kilometer x 5.711 ~ Ibs/squarc mile
-------
APPENDIX B
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLO* INFORMATION FOR IDAHO
08/23/T6
LAKE CODE 1607
ISLAND PARK PES.
TOTAL DRAINAGE AREA OF LAKEISO KM)
SUB-DRAINAGE
TRIBUTARY AREAISQ KM)
JAN
FEB
1245.8
MAR'
APR
MAY
NORMALIZED FLOWS(CMS)
JUN JUL AUG
SEP
OCT
NOV
DEC
MEAN
1607A1
1607A2
160781
1607C1
1607D1
1607E1
1607Z7
1245.8
676.0
38.3
32.4
19.7
282.3
197.1
4.96
7.02
0.20
0.028
0.48
0.40
1.67
6.91
7.02
0.20
0.028
0.48
0.40
1.67
fl.38
7.14
0.20
0.028
0.54
0.40
1.78
12.86
10.73
0.40
0.057
0.76
1.76
2.89
27.33
14.10
1.59
0.085
0.79
3.28
4.56
25.94
9.51
1.84
0.255
0.71
1.67
4.42
30.58
11.64
0.54
0.227
0.59
0.68
2.80
31.15
11.84
0.31
0.085
0.45
0.37
2.07
22.00
8.35
0.28
0.085
0.45
0.23
1.81
13.65
7.67
0.25
0.057
0.48
0.28
1.78
R.52
7.31
0.25
0.057
0.48
0.3*
1.76
6.14
7.08
0.23
0.028
0.48
0.40
1.70
16.61
9.14
0.52
0.085
0.56
0.85
2.41
SUMMARY
TOTAL DRAINAGE AREA OF LAKE =
SUM OF SUB-DRAINAGE AREAS =
1245.8
1245.8
TOTAL FLOW IN
TOTAL FLOW OUT
162.54
198.42
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY
1607A1
MONTH
YEAR
MEAN FLOW DAY
FLOW DAY
FLOW DAY
FLOW
1607A2
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
74
74
74
75
75
75
75
75
75
75
75
75
74
74
74
75
75
75
75
75
75
75
75
75
21.181
16.395
17.641
17.443
10.647
15.150
23.446
31.998
35.396
28.911
34.037
21.408
12.601
13.224
14.073
14.017
14.187
15.291
15.206
16.311
14.442
15.857
15.801
15.121
19
3
23
11
q
8
12
3
3
12
10
14
19
3
23
11
9
8
1?
3
13
12
10
14
18.604
23.928
18.293
18.604
9.175
15.433
27.722
21.577 31
47.006
26.051
34.830
20.303
12.743
12.459
14.102
14.073
14.045
15.291
15.234
15.631 31
20.671 15
16.424
16.424
15.065
43.891
14.640
20.671
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TRIBUTARY FLOW INFORMATION FOR IDAHO
08/33/76
LAKE CODE 1607
ISLAND PARK RES.
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY
160791
1607C1
1607D1
1607E1
MONTH
YEAR
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
9
9
10
11
12
i
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
B
9
74
74
74
75
75
75
75
75
75
75
75
75
74
74
74
75
75
75
75
75
75
75
75
75
74
74
74
75
75
75
75
75
75
75
75
75
74
74
74
75
75
75
75
75
75
75
75
75
MEAN FLOW DAY
FLOW DAY
FLOW DAY
FLOW
0.340
0.311
0.311
0.283
0.229
0.201
0.190
0.850
3.540
2.209
0.481
0.340
0.071
0.068
0.065
0.054
0.040
0.031
0.028
0.340
3.398
1.586
0.127
0.074
0.623
0.623
0.623
0.566
0.510
0.453
0.453
1.161
2.917
2.180
0.793
0.651
2.435
2.407
2.379
2.237
2.067
1.954
1.897
3.710
6.881
5.635
2.860
2*464
19
3
23
11
9
8
12
31
13
12
10
14
19
3
23
11
9
8
12
31
13
12
10
14
19
3
23
11
9
'B
12
31
13
12
10
14
19
3
23
11
9
P
12
31
13
12
10
14
0.227
0.227
0.283
0.255
0.227
0.227
0.170
2.549
9.628
1.756
0.453
0.227
0.057
0.057
0.057
0.057
0.028
0.028
0.028
2.860
3.653
2.464
0.113
0.057
0.623
0.623
0.566
0.538
0.510
0.481
0.425
2.718
3.002
2.577
0.765
0.623
3.115
2.662
2.294
2.209
2.124
2.010
1.841
5.097
20.105
2.662
2.237
2.237
15
3.964
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
160701
44 23 41.0 111 33 13.0 3
ISLAND PARK RESERVOIR
16043 IDAHO
11EPALES 751117 2111303
0014 FEET DEPTH CLASS 00
DATE TIME DEPTH WATER
FROM OF
TO DAY FEET
75/07/30 09 30 0000
09 30 000*=;
09 30 0010
75/09/03 09 30 0000
09 30 0005
75/10/30 11 15 0000
11 15 0005
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/07/30 09 30 0000
09 30 0005
09 30 0010
75/09/03 09 30 0000
09 30 0005
75/10/30 11 15 0000
11 15 0005
0010
TER
EMP
ENT
16.8
17.0
16.9
15.0
15.0
8.5
8.4
0665
S-TOT
/L P
0.023
0.028
0.034
0.124
0.123
0.056
0.077
00300
DO
MG/L
9.0
8.2
7.8
5.2
5.0
9.1
7.1
32317
CHLRPHYL
A
UG/L
2.8
5.3
0.9
00077
TRANSP
SECCHI
INCHES
146
44
96
00031
INCDT LT
RFMNING
PERCENT
00094
CNDUCTVY
FIELD
MICROMHO
133
134
137
130
130
126
126
00400
PH
SU
9.30
9.30
9.30
6.75
7.75
9.00
8.30
00410
T ALK
CAC03
MG/L
83
80
80
74
77
74
84
00610
NH3-N
TOTAL
MG/L
0.030
0.030
0.030
0.050
0.060
0.040
0.070
00625
TOT KJEL
N
MG/L
0.200
0.200
0.300
0.500
0.500
0.300
0.400
00630 00671
N02&N03 PHOS-DIS
N-TOTAL 0»THO
MG/L MG/L P
0.030K
0.030K
0.020K
0.100
0.100
0.020K
0.090
0.013
0.011
0.014
0.037
0.027
0.017
0.03ft
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORE! RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
16070?
44 25 37.0 111 27 20.0 3
ISLAND PARK RESERVOIR
16043 IDAHO
11EPALES 751117 2111202
0053 FEET DEPTH CLASS 00
DATE
FROM
TO
75/07/30
75/09/03
75/10/20
DATE
FROM
TO
TIME DEPTH
OF
DAY FEET
10 00 0000
10 00 0005
10 00 0030
10 00 0049
09 55 0000
09 55 0005
09 55 0015
09 55 0030
09 55 0045
10 20 0005
11 00 0000
11 00 0005
11 00 0016
11 00 0040
TIME DtPTH
OF
DAY FEET
00010
WATER
TEMP
CENT
17.6
17.7
11.1
8.5
16.3
16.2
16.1
15.8
14.1
9.9
9.8
9.7
8.8
00665
PHOS-TOT
MG/L P
00300
DO
MG/L
9.2
8.8
4.0
3.2
9.2
9.0
9.2
9.0
8.0
8.4
8.8
8.4
6.4
32217
CHLRPHYL
A
UG/L
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
168 145
139
116
105
52 121
123
121
120
108
120 106
111
107
106
00031
INCDT LT
RF.MNING
PERCENT K VALUE
00400
PH
SU
9.30
9.40
8.60
8.40
9.00
9.10
9.15
9.15
8.85
9.00
9.00
8.70
8.45
KNOWN TO BE
00410
T ALK
CAC03
MG/L
74
73
68
62
68
68
70
73
66
72
68
68
68
73
LESS
00610
NH3-N
TOTAL
MG/L
0.020
0.020
0.060
0.160
0.040
0.030
0.020
0.040
0.050
0.020K
0.020
0.040
0.060
0.070
00625
TOT KJEL
N
MG/L
0.400
0.200K
0.200K
0.200
0.400
0.400
0.300
0.500
0.300
0.200
0.200
0.300
0.300
0.300
00630
N02S.N03
N-TOT4L
MG/L
0.020K
0.020K
0.020
0.040
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.040
00671
PHOS-DIS
ORTHO
MG/L P
0.012
0.012
0.034
0.066
0.008
0.011
0.012
0.012
0.013
0.004
0.00$
0.018
0.021
0.029
THAN INDICATED
75/07/30
75/09/03
75/10/20
10 00 0000
10 00 0005
10 00 0030
10 00 0049
09 55 0000
09 55 0005
09 55 0015
09 55 0030
09 55 0045
10 20 0005
11 00 0000
11 00 0005
11 00 0016
11 00 0040
0.019
0.018
0.04]
0.105
0.062
0.063
0.024
0.032
0.035
0.029
0.037
0.055
0.052
0.089
2.3
18.7
19.6
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
160703
44 35 12.0 111 23 42.0 3
ISLAND PARK RESERVOIR
16043 IDAHO
11EPALES 751117 3111202
0073 FEET DEPTH CLASS 00
DATE
FROM
TO
75/07/30
75/09/03
75/10/20
00010
TIME DEPTH *ATER
OF TEMP
DAY FEET
10
10
10
10
10
10
10
10
10
10
10
10
10
10
15
15
15
15
15
20
20
20
20
20
30
30
30
30
0000
0005
0020
0045
0069
0000
0005
0015
0040
0064
0000
0005
0021
0051
CENT
17.8
17.8
13.2
8.8
6.3
16.6
16.5
15.8
13.6
10.2
10.2
10.1
8.8
00300
DO
MG/L
6.8
8.6
7.2
4.8
2.2
8.8
8.2
8.4
5.4
8.5
8.6
7.9
7.4
00300
DO
MG/L
6.8
8.6
7.2
4.8
2.2
6.8
8.2
8.4
5.4
8.5
8.6
7.9
7.4
00077
TRANSP
SECCHI
INCHES
132
96
120
00094
CNDUCTVY
FIELD
MICROMHO
135
132
123
102
93
120
120
119
117
118
89
105
97
00400
PH
SU
9.30
9.20
7.90
7.80
8.10
9.10
9.10
9.10
8.30
9.00
9.10
8.70
8.50
00410
T ALK
CAC03
MG/L
71
70
64
61
60
72
72
71
72
74
66
68
67
63
00610
NH3-N
TOTAL
MG/L
0.030
0.020
0.030
0.060
0.400
0.0?0
0.020K
0.020
0.020
0.210
0.020K
0.020K
0.050
0.070
00625
TOT KJEL
N
MG/L
0.200K
0.300
0.200K
0.200K
0.500
0.200
0.200
0.200
0.300
0.400
0.300
0.200
0.200
0.200
00630
N02&N03
N-TOTAL
MG/L
0.020K
0.020K
0.020K
0.020
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00671
PHOS-DIS
ORTHO
MG/L P
0.014
0.012
0.012
0.024
0.134
0.005
0.004
0.003
0.004
0.032
O.OOS
0.010
0.014
0.018
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
75/07/30 10 15 0000 0.022 5.1
10 15 0005 0.019
10 15 0020 0.017
10 15 0045 0.030
10 15 0069 0.258
75/09/03 10 20 0000 0.017 26.3
10 20 0005 0.029
10 20 0015 0.020
10 20 0040 0.016
10 20 0064 0.052
75/10/20 10 30 0000 0.029 2.9
10 30 0005 0.034
10 30 0021 0.037
10 30 0051 0.044
00031
INCDT LT
RF.MNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
STORET RETRIEVAL DATE'76/08/25
NATU EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N024.N03
FROM OF
TO DAY FEET
74/10/19
74/11/03
75/01/11
75/02/09
75/03/08
75/04/12
75/05/03
75/05/31
75/06/03
75/07/12
75/08/10
75/09/14
12 47
11 15
15 32
12 38
11 15
11 00
09 00
11 40
11 50
12 10
10 00
12 10
1607A1
44 25 05.0 111 23 43.0 4
HENRYS FORK
16 7.5 ISLAND PK DM
0/ISLANO PARK RESERVOIR 130691
BELO DAM 4.5 MI H OF RT 20/191 JCT
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
G/L
0.040
0.024
0.072
0.112
0.155
0.100
0.120
0.005
0.010
0.005
0.015
0.055
00625
TOT KJEL
N
M6/L
0.300
0.650
0.300
0.700
0.350
2.700
1.950
1.050
1.150
0.500
0.300
0.500
00610
NH3-N
TOTAL
MG/L
0.050
0.050
0.060
0.112
0.025
0.055
0.060
0.025
0.015
0.015
0.070
0.110
00671
PHOS-DIS
ORTHO
MG/L P
0.015
0.035
0.030
0.032
0.030
0.030
0.020
0.005K
0.014
0.010
0.050
0.075
00665
PHOS-TOT
MG/L P
0.025
0.035
0.050
0.060
0.040
0.030
0.060
0.025
0.030
0.020
0.060
0.080
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATIOM SURVEY
EPA_ LAS VEGAS
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/19
74/11/03
75/01/11
75/03/08
75/04/12
75/05/03
75/06/13
75/06/15
75/07/12
75/08/10
75/09/14
14
10
15
11
11
09
12
11
12
11
11
10
40
10
48
34
50
30
45
45
40
30
1607A2
44 29 25.0 111 23 52.0 4
HENRYS FORK
16 7.5 ISLAND PK DM
T/ISLAND PARK RESERVOIR 130691
8NK 300 FT V END RD BY LWR COFFE POT CMP
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
G/L
0.040
0.024
0.07E
0.060
0.070
0.030
0.010
0.005
0.005
0.035
00625
TOT KJEL
N
MG/L
0.300
0.300
0.200
0.150
1.250
0.350
1.200
1.500
0.450
0.500
0.800
00610
MH3-N
TOTAL
MG/L
0.015
0.020
0.020
0.015
0.030
0.040
0.030
0.090
0.015
0.045
0.020
00671
PHOS-DIS
ORTHO
MG/L P
0.005K
0.005K
0.005
0.005
0.010
0.005
0.015
0.025
0.005
0.040
00665
PHOS-TOT
MG/L P
0.010
0.005K
0.020
0.010K
0.010
0.070
0.020
0.025
0.010K
0.040
K VALUE KNOWN TO BE LESS
THAN INDICATED -
-------
STOPET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&.N03
FROM OF
TO DAY FEET
74/10/19 15 40
74/11/03 10 20
75/05/31 12 10
75/06/13 13 00
75/07/12 13 13
75/08/10 11 05
75/09/14 09 55
1607B1
44 27 38.0 111 26 45.0 4
HOTEL CREEK
16 7.5 ISLAND PK DM
T/ISLAND PARK RESERVOIR 130691
SEC RD 8RDG 2 HI W HCCREA BRDG CMP
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&.N03
OTAL
IG/L
0.024
0.008
0.065
0.035
0.030
0.015
0.045
00625
TOT KJEL
N
MG/L
0.100
0.100K
1.700
0.500
0.500
0.250
0.750
00610
NH3-N
TOTAL
MG/L
0.010
o.oao
0.045
0.015
0.025
0.005K
0.015
00671
PHOS-DIS
ORTHO
MG/L P
o.oao
0.030
0.025
0.025
0.025
0.015
0.057
00665
PHOS-TOT
MG/L P
0.025
0.030
0.070
0.050
0.040
0.015
0.060
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/19
74/11/03
75/01/11
75/02/09
75/05/31
75/06/13
75/06/15
75/07/12
75/08/10
75/09/14
16 10
10 15
14 35
11 30
12 20
13 15
11 40
13 40
11 15
10 10
1607C1
44 27 03.0 111 28 12.0 4
SHEEP CREEK
16 7.5 ISLAND PK DM
T/ISLAND PARK RESERVOIR 130691
SEC RD BRDG 4 MI WSW OF MCCREA BROG CMP
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
«,N03
OTftL
G/L
0.016
0.008
0.128
0.128
0.090
0.010
0.010
0.005
0.030
00625
TOT KJEL
N
MG/L
0.400
0.400
0.500
0.500
1.900
1.300
1.700
0.300
0.300
1.000
00610
NH3-N
TOTAL
MG/L
0.020
0.025
0.075
0.096
0.050
0.025
0.260
0.020
0.025
0.015
00671
PHOS-DIS
ORTHO
MG/L P
0.010
0.020
0.030
0.024
0.055
0.025
0.020
0.030
0.050
00665
PHOS-TOT
MG/L P
0.025
0.025
0.050
0.060
0.100
0.070
0.070
0.050
0.050
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&.N03
FROM OF
TO DAY FEET
74/10/19 16 40
74/11/03 10 00
75/05/31 12 45
75/06/13 13 40
75/07/12 14 00
75/08/10 11 35
75/09/14 10 30
1607D1
44 25 05.0 111 34 57.0 4
ICEHOUSE CREEK
16 7.5 ICEHOUSE CRK
T/ISLAND PARK RESERVOIR 130*91
SEC RD 8ROG 1.1 Ml E OF COUNTY LINE
11EPALES 2111204
oooo FEET DEPTH CLASS oo
0630
&.N03
OTAL
G/L
0.024
0.048
0.230
0.165
0.095
0.045
0.050
00625
TOT KJEL
N
MG/L
0.700
0.200
0.600
0.850
0.550
0.600
0.400
00610
NH3-N
TOTAL
MG/L
0.015
0.020
0.025
0.020
0.025
0.025
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.005
0.020
0.025
0.020
0.020
0.015
0.035
00665
PHOS-TOT
MG/L P
0.015
0.035
0.050
0.070
0.035
0.015
0.040
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH NO?S.N03
FROM OF
TO DAY FEET
74/10/1*) 16 55
74/11/03 10 05
75/05/31 12 50
75/06/13 13 55
75/07/12 14 20
75/08/10 12 00
75/09/14 10 45
1607E1
44 34 42.0 111 35 48.0 4
SHERIDAN CREEK
16 7.5 ICEHOUSE CRK
T/ISLAMD PARK RESERVOIR 130691
GRN CYN RO BRDG 1 MI F OF COUNTY LINE
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
S.N03
OTAL
G/L
0.016
0.008
0.045
0.005
0.015
0.005
0.030
00625
TOT KJEL
N
MG/L
0.600
0.200
0.400
1.150
0.600
0.600
1.000
00610
NH3-N
TOTAL
MG/L
0.020
0.015
0.020
0.020
0.025
0.025
0.015
00671
PHOS-DIS
ORTHO
MG/L P
0.005K
0.005
0.045
0.045
0.065
0.015
0.030
00665
PHOS-TOT
MG/L P
0.010
0.010
0.120
0.130
0.100
0.020
0.040
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX E
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1975
STATE OF IDAHO
Mean or median values for six of the key parameters evaluated
in establishing the trophic conditions of Idaho lakes sampled are
presented to allow direct comparison of the ranking, by parameter,
of each lake relative to the others. Median total phosphorus, median
inorganic nitrogen and median dissolved orthophosphorus levels are
expressed in mg/1. Chlorophyll a_ values are expressed in yg/1.
To maintain consistent rank order with the preceding parameters,
the mean Secchi disc depth, in inches, is subtracted from 500.
Similarly, minimum dissolved oxygen values are subtracted from 15
to create table entries.
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
1601 AMERICAN FALLS RESERVOIR
1602 CASCADE LAKE
1603 LAKE COEUR D'ALENE
1604 OWOHSHAK RESERVOIR
1605 HAUSER
1606 HAYDEN LAKE
1607 ISLAND PARK RESERVOIR
1603 LAKE LOWELL
1609 MAGIC RESERVOIR
1610 PALISADES RESERVOIR
1611 LOWER PAYETTE
1612 LOWER TWIN LAKES
1613 UPPER TWIN LAKES
MEDIAN
TOTAL P
0.105
0.032
0.017
0.010
0.028
0.010
0.034
0.070
0.062
0.024
0.013
0.016
0.017
MEDIAN
INORG N
0.030
0.060
0.040
0.080
0.075
0.040
0.050
0.070
0.130
0.080
0.060
0.050
0.045
500-
MEAN SEC
463.800
415.067
380.348
401.866
366.286
243.500
391.778
477.111
400.750
345.428
234.000
370.000
369.143
MEAN
CHLORA
15.379
8.031
10.391
2.420
11.112
2.787
9.322
25.389
7.322
2.067
4.600
2.318
4.986
15-
MIN 00
14.700
14.800
12.200
7.400
14.800 *
11.800
12.800
14.600
14.700
12.800
9.600
13.600
8.200
MEDL
DISS ORTI
0.035
0.009
0.005
0.009
0.013
0.003
0.012
0.015
0.020
0.007
0.007
0.009
0.004
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PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE MEDIAN MEDIAN 500- MEAN 15- MEDIAN
CODE LAKE NAME TOTAL P INORG N MEAN SEC CHLORA MIN DO OISS ORTHO P
1601 AMERICAN FALLS RESERVOIR 0(0) 17 ( 1) 8(1) 8(1) 21 ( 2) 0(0)
1602 CASCADE LAKE 33 ( 4) 54 ( 6) 17 ( 2) 42 ( 5) 4 ( 0) 50 ( 5)
1603 LAKE COEUR D'ALENE 67 (8) 96 ( 11) 50 (6) 25 ( 3) 67 (8) 83 ( 10)
1604 DWORSHAK RESERVOIR 96 ( 11) 17 ( 1> 25 ( 3) 83 ( 10) 100 ( 12) 50 ( 5)
1605 HAUSER 42 ( 5) 33 ( 4) 75 ( 9) 17 ( 2) 4 ( 0) 25 ( 3)
1606 hAYOEN LAKE 96 ( 11) 96 ( 11) 92 ( 11) 75 ( 9) 75 ( 9) 100 ( 12)
1607 ISLAND PARK RESERVOIR 25 ( 3) 71 ( 8) 42 (5) 33 ( 4) 54 (6) 33 ( 4)
1608 LAKE LOWELL 8(1) 42 ( 5) 0 ( 0) 0(0) 33 ( 4) 17 ( 2)
1609 MAGIC RESERVOIR 17 ( 2) 0 ( 0) 33 ( 4) SO ( 6) 21 ( 2) 6 ( 1)
1610 PALISADES RESERVOIR 50 (6) 17 ( 1) 83 ( 10) 100 (12) 54 ( 6) 75 ( 9)
1611 LOWER PAYETTE 63 ( 10) 54 ( 6) 100 ( 12) 67 (8) 83 ( 10) 67 ( 8)
1612 LOWER TWIN LAKES 75 (9) 71 ( 8) . 58 ( 7) 92 ( 11) 42 (5) 50 ( 5)
1613 UPPER TWIN LAKES 58 (7) 83 ( 10) 67 ( 8) 58 ( 7) 92 ( 11) 92 ( 11)
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