U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
PAYETTELAKE
VALLEY COUNTY
IDAHO
EPA REGION X
WORKING PAPER No, 784
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
PAYETELAKE
VALLEY CQUNIY
IDAHO
EPA REGION X
WORKING PAPER No, 784
WITH THE COOPERATION OF THE
IDAHO DEPARTMENT OF HEALTH AND WELFARE
AND THE
IDAHO NATIONAL GUARD
JULY, 1977
-------
REPORT ON PAYETTE LAKE
VALLEY 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. 784
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
July 1977
-------
CONTENTS
Page
Foreword i -j
List of Idaho Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions ]
II. Lake and Drainage Basin Characteristics 4
III. Lake Water Quality Summary 6
IV. Nutrient Loadings 12
V. Literature Reviewed 17
VI. Appendices 18
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ii
FOREWORD
The National EutropMcatlon Survey was Initiated 1n 1972 1n
response to an Administration commitment to Investigate the nation-
wide threat of accelerated eutrophicatlon 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 1n lake water-
sheds. ,
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophicatlon 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 eutrophicatlon 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 1s formatted to provide state
environmental agencies with specific Information for basin
E Tanning [§303(e)], water quality criteria/standards review
§303(c)], clean lakes [§314(a,b)], and water quality monitoring
[§106 and §305(b)] activities mandated by the Federal Water
Pollution Control Act Amendments of 1972.
-------
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
Blaine, Camas
Bonneville (Lincoln in WY)
Valley
Kootenai
Kootenai
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Map Location
PAYETTE LAKE
0 Tributary Sampling Site
X Lake Sampling Site
^. Drainage Area Boundary
Scale
5 Mi.
116*00'
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REPORT ON PAYETTE LAKE, IDAHO
STORE! NO. 1611
I. CONCLUSIONS
A. Trophic Condition:*
Based on field observations and Survey data, Payette Lake
is considered early mesotrophic. Chlorophyll a_ values ranged
from 1.4 yg/1 to 13.8 yg/1 with a mean of 4.6 yg/1. Potential
for primary productivity as measured by algal assay control
yield was low. Of the 13 Idaho lakes sampled in 1975, 10 had
greater median total phosphorus, 6 had greater median inorganic
nitrogen, and 8 had greater median orthophosphorus levels than
Payette Lake.
Survey limnologists did not note any problem conditions
during their visits to the lake. However, the Idaho Environmental
Overview (Idaho Department of Water Resources, et al. 1975)
reports pollutants in the reservoir attributable to discharge
from septic tanks and a lumber mill located near the lake.
*See Appendix E.
-------
B. Rate-Limiting Nutrient:
Algal assay results indicate that Payette Lake was limited
by available phosphorus levels. Spikes with phosphorus, or nitrogen
and phosphorus simultaneously resulted in increased assay yields.
Addition of nitrogen alone did not stimulate a growth response.
Lake data indicate phosphorus to be limiting primary production on
one of the sampling dates (09/16/75) whereas nitrogen appears to
be limiting on the other two sampling occasions.
C. Nutrient Controllability:
1. Point sources -
There were no known point sources impacting Payette Lake
during the sampling year. Septic tanks were estimated to
account for 0.4% of the phosphorus input. However, the Idaho
Department of Highways map used for the septic tank determination
did not show individual residences, and Survey limnologists
reported more homes surrounding the lake than were estimated
using this map. These uncounted additional residences could
substantially increase the calculated phosphorus loading to
Payette Lake,
2
The present estimated loading of 0.19 g P/m /yr is less
than that proposed by Vollenweider (1975) as an "oligotrophic"
loading (See Section IV-F). Although the actual phosphorus
loading to the lake is probably greater than estimated, the
-------
fact remains that water quality in Payette Lake is high, and
any potential sources of pollution should be evaluated carefully
in order to maintain the excellent condition of the lake.
2. Nonpoint sources -
Gaged tributaries accounted for 70.3% of the total phosphorus
load reaching Payette Lake during the sampling year. The
estimated phosphorus load from ungaged drainage areas was
20.3% of the total load.
The phosphorus export rates of the two gaged tributaries
impacting Payette Lake (Section IV-D) are substantially lower
than those found in tributaries draining into downstream
2
Cascade Reservoir (range of 20-31 kg P/km /yr, mean of 25 kg
P/km2/yr).*
*See "Report on Cascade Reservoir", Working Paper No. 777.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake surface area, mean depth and volume were provided by Herman Ray
(personal communication). Tributary 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:
1. Surface area: 21.60 km2.
2. Mean depth: 5.7 meters.
3. Maximum depth: ?
4. Volume: 123.349 x 106 m3.
5. Mean hydraulic retention time: 140 days.
-------
B. Tributary and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage^ Mean flow
Name area (km ) (m3/sec)
A-2 North Fork Payette River 255.9 7.58
B-l Horse Creek 12.8 0.29
Minor tributaries and
immediate drainage - 82.5 2.71
Totals 351.2 10.58
2. Outlet - A-l North Fork Payette 373.0 10.19
River
C. Precipitation:
1. Year of sampling: 77.7 cm.
2. Mean annual: 71.6 cm.
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III. LAKE WATER QUALITY SUMMARY
Payette Lake was sampled three times during the open-water
season of 1975 by means of a pontoon-equipped Huey helicopter. 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 enumeration. During the first and last visits,
18.9-liter depth-integrated samples were composited for algal assays.
Maximum depths sampled were 53.3 meters at Station 01, 53.3 meters at
Station 02, and 33.5 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 a^ determinations are included in III-B. Results of the limiting
nutrient study are presented in III-C.
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STORET CODE 1611
PHYSICAL AND CHEMICAL CHARACTERISTICS
PARAMETER
TEMPERATURE (DEG CENT)
O.-l. 5 M DEPTH
MAX DEPTH**
DISSOLVED OXYGEN (MG/L)
0.-1.5 M 9EPTH
MAX DEPTH**
CONDUCTIVITY
0.-1.5 M DEPTH
MAX DEPTH**
PH (STANDARD UNITS)
O.-l. "5 M DEPTH
MAX DEPTH**
TOTAL ALKALINITY (MG/L)
O.-l .5 M DEPTH
MAX DEPTH**
TOTAL P (MG/L)
O.-l. 5 M DEPTH
MAX DEPTH**
DISSOLVED ORTHO P
O.-l. 5 M DEPTH
MAX DEPTH**
N02+N03 (MG/L)
O.-l. 5 M DEPTH
MAX DEPTH**
AMMONIA (MG/L)
O.-l. 5 M DEPTH
MAX DEPTH**
KJELDAHL N (MG/L)
O.-l. 5 M DEPTH
MAX DEPTH**
SECCHI DISC (METERS)
N*
ENT)
6
3
MG/L)
6
3
^)
0
0
)
6
3
MG/L)
6
3
6
3
(MG/L)
6
3
6
3
6
3
6
3
( 6/ 4/75
S*»* = 1
RANGE MEDIAN
3.8-
3.1-
9.4-
8.4-
9.5
3.4
11.0
10.0
7.4
3.2
9.6
8.8
MAX
DEPTH
PANGt
(METERS)
0.0-
33.5-
0.0-
33.5-
1.5
50.3
1.5
50.3
::::::::::: ::::: ::::::::::
7.0-
6.8-
11.-
10.-
0.008-0
0.010-0
0.011-0
0.009-0
0.020-0
0.030-0
0.030-0
0.020-0
0.200-0
0.200-0
7.6
7.0
17.
13.
.014
.039
.016
.013
.060
.060
.040
.040
.300
.200
7.4
7.0
15.
12.
0.010
0.012
0.013
0.. 0 1 2
0.045
0.050
0.040
0.030
0.200
0.200
0.0-
33.5-
0.0-
33.5-
0.0-
33.5-
0.0-
33.5-
0.0-
33.5-
0.0-
33.5-
n.o-
33.5-
1.5
50.3
1.5
50.3
1.5
50.3
1.5
50.3
1.5
50.3
1.5
50.3
1.5
50.3
N*
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
( 8/ 1/75
S»«* = 3
RANGE MEDIAN
13.9- 15.3
0.6- 1.5
5.4- 9.8
7.6- 8.2
14.- 481.
18.- 18.
7.2- 8.4
6.7- 7.1
10.- 149.
10.- 18.
0.005-0.116
0.007-0.070
0.007-0.033
0.007-0.009
0.020-0.080
0.040-0.060
0.020-0.060
0.020-0.030
0.200-0.500
0.200-0.400
14.3
1.0
7.6
8.0
17.
18.
7.3
7.1
15.
12.
0.011
0.010
0.008
0.009
0.020
0.050
0.020
0.020
0.200
0.200
MAX
DEPTH
RANGE
(METERS!
0.0-
32.3-
0.0-
32.3-
0.0-
32.3-
0.0-
32.3-
0.0-
32.3-
0.0-
32.3-
0.0-
32.3-
0.0-
32.3-
0.0-
32.3-
0.0-
32.3-
1.5
53.3
1.5
53.3
1.5
53.3
1.5
53.3
1.5
53.3
1.5
53.3
1.5
53.3
1.5
53.3
1.5
53.3
1.5
53.3
N*
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
{ 9/16/75
S««* = 3
RANGE MEDIAN
16.4- 17.9
4.7- 6.0
7.9- 8.6
7.8- 9.1
16.- 21.
14.- 23.
7.1- 8.1
6.5- 7.1
10.- 13.
10.- 12.
0.017-0.031
0.022-0.301
0.002-0.004
0.002-0.002
0.020-0.020
0.040-0.060
0.020-0.020
0.020-0.020
0.200-0.200
0.200-0.400
17.6
5.2
B.I
B.I
18.
16.
7.7
6.8
10.
10.
0.024
0.022
0.002
0.002
0.020
0.050
0.020
0.020
0.200
0.200
1
MAX
DEPTH
RANGE
(METERS)
0.0- 1.5
29.9- 53.3
0.0- 1.5
29.9- 53.3
0.0- 1.5
29.9- 53.3
0.0- 1.5
29.9- 53.3
0.0- 1.5
29.9- 53.3
0.0- 1.5
29.9- 53.3
0.0- 1.5
29.9- 53.3
0.0- 1.5
29.9- 53.3
0.0- 1.5
29.9- 53.3
0.0- 1.5
29.9- 53.3
3.5- 12.5
7.2
4.0- 4.0
4.0
6.7- 6.7 6.7
* N = NO. OF SAMPLES
** MAXIMUM DEPTH SAMPLED AT EACH SITE
*** 5 = NO. OF SITES SAMPLED ON THIS DATE
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B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
06/04/75
08/01/75
09/16/75
Dominant
Genera
1. Asterionella
2. Melosira
3. Synedra
4. Chroomonas
5. Cryptomonas
Other genera
Total
1.
2.
3.
4.
5.
Asterionella
Melosira
label 1 aria
Chroomonas
Synedra
1.
2.
3.
4.
Other genera
Total
Tabellaria
Melosira
Asterionella
Crucigenia
Other genera
Total
Algal
Units
per ml
1,170
1,080
225
90
45
2,610
1,505
1,254
502
351
151
150
3,913
629
449
180
45
1,303
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2. Chlorophyll a^ -
Sampling Station Chlorophyll a_
Date Number (yg/1)
06/04/75 01 3.0
02 3.3
03 1.4
08/01/75 01 6.2
02 2.6
03 13.8
09/16/75 01 4.6
02 3.7
03 2.8
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10
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked
a. 06/04/75
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 I*
1.00 N
b. 09/16/75
Ortho P
Cone, (mg/1)
0.005
0.055
0.055
0.005
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
Ortho P
Cone, (mg/1)
0.005
0.055
0.055
0.005
Inorganic N
Cone, (mg/1)
0.035
0.035
1.035
1.035
Inorganic N
Cone, (mg/1)
0.045
0.045
1.045
1.045
Maximum Yield
(mg/1-dry wt.)
0.2
1.1
18.0
0.2
Maximum Yield
(mg/1-dry wt.)
0.2
1.4
14.1
0.2
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11
2. Discussion -
The control yields of the assay alga, Selenastrum capri-
cornutum, indicate that potential for primary production in Payette
Lake was low at both sample collection times (06/04/75, 09/16/75).
The addition of phosphate produced an increase in yield over that
of the control, indicating phosphorus limitation. Spikes with
nitrogen and phosphorus simultaneously resulted in maximum yield
while the addition of nitrogen alone did not stimulate growth beyond
the control yield.
Lake data show mean N/P ratios of approximately 6/1 and 7/1 on
the first and second sampling dates, respectively, indicating
nitrogen limitation. On the third sampling date, the N/P ratio
was 18/1 indicating phosphorus limitation (an N/P ratios of 14/1 or
greater is generally considered indicative of phosphorus limitation).
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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 June and July when two samples were collected. Samp-
ling was begun in October 1974, and was completed in September 1975.
Through an interagency agreement, stream flow estimates for the
year of sampling and a "normalized" or average year were provided 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 tributaries
are those measured minus known point source loads, if any.
Nutrient loadings for unsampled "minor tributaries and immediate
drainage" ("11" of USGS) were estimated by using the mean annual
2
nutrient loads, in kg/km /yr, in North Fork Payette River and Horse
Creek at Stations A-2 and B-l and multiplying the means by the 11
2
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 North Fork Payette River 2,770 67.7
B-l Horse Creek 105 2.6
b. Minor tributaries and immediate
drainage (nonpoint load) - 825 20.3
c. Known municipal STP's - None
d. Septic tanks* - 15 0.4
e. Known industrial - None
f. Direct precipitation** - 380 9.0
Totals 4,095 100.0
2. Output - A-l North Fork Payette 4,030
River
3. Net annual P accumulation - 65
*Estimate based on 27 lakeshore residences, 3 camps and 1 park,
**Estimated (See NES Working Paper No. 175).
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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 North Fork Payette River. 129,995 65.6
B-l Horse Creek 5,505 2.8
b. Minor tributaries and immediate
drainage (nonpoint load) - 38,690 19.5
c. Known municipal STP's - None
d. Septic tanks* - 535 0.3
e. Known industrial - None
f. Direct precipitation** - 23,320 11.8
Totals 198,045 100.0
2. Outputs - A-l North Fork Payette 118,875
River
3. Net annual N accumulation - 79,170
*Estimate based on 27 lakeshore residences, 3 camps and 1 park.
**Estimated (See NES Working Paper No. 175).
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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
North Fork Payette River 11 508
Horse Creek 8 430
E. Mean Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total N
Tributary (mg/1) (mg/1)
C-l Elip Creek <0.012 0.282
D-l Fall Creek <0.015 0.504
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16
F. 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
"mesdtrophic" loading would be considered one between "eutrophic" and
"oligotrophic."
Note that Vollenweider's model may not be applicable 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 Payette Lake 0.19
Vollenweider's "eutrophic" loading 0.74
Vollenweider's "oligotrophic" loading 0.37
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17
V. LITERATURE REVIEWED
Idaho Department of Water Resources, Department of Health and Welfare,
Department of Fish and Game, and Department of Budget, Policy
Planning and Coordination. 1975. Idaho Environmental Review.
Boise, Idaho.
Ray, Herman. 1976. Morphometric Data of Selected Idaho Water Bodies
(Personal Communication). Boise, Idaho.
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 Laboratroy, 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 motors/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 - pounds
Kilograms/square kilometer x 5.711 ~ Ibs/square mile
-------
APPENDIX B
TRIBUTARY FLOW DATA
-------
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 rneters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 - pounds
Kilograms/square kilometer x 5.711 ~ Ibs/square mile
-------
IMFOPMiTIOM FOK IDAHO
Oe/?3'/76
LAKE CODE 1611
P4YETTF. LAKE
TOTAL DRAINAGE AREA OF LAKE(SQ KM)
373.0
JAN
FFB
APP
NORMALIZED FLOwS(CMS)
JUN JUL AUG
SEP
OCT
NOV
DEC
1611A1
161 I A?
161131
16117?
373.0
?55.9
12.8
104.1
2.46
0.74
0.057
0.37
i.69
0.79
0.057
0.40
'.7?
0.82
0.085
0.51
6.73
7.93
0.283
2.78
4 0 , e 1
32.00
1.133
11.10
4 1
35
1.
12
.34
.96
189
.15
3.69
9.06
0.311
3.11
*- T rt
0.51
0.057
0.34
2.78
0.45
0.057
0.31
3.94 2.21
0.79 0.38
0.057 0.085
0.40 0.51
2.*6
0.79
0.085
0.51
SUMMARY
TOTAL
SUM OF
DRAINAGE
SUB-DRA
ARFA OF
LAKE =
INAGE AHEAS =
37?. 0
37?. 8
TOTAL FLO*
TOTAL FLOW
IN =
OUT =
126.66
121.99
MEAN
10.19
7.^8
2.71
MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY MONTH
1611A1
YEAK
MEAN FLOW DAY
FLOW DAY
FLOW DAY
FLOW
1611A?
in
11
12
1
2
3
4
5
6
7
fl
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
3.738
1.274
1.331
1 .586
1.926
1.756
1.756
14.300
59.749
28.090
7.221
8.353
0.283
0.538
0.991
1.104
1.416
1.133
1.218
10.449
43.608
20.870
3.341 '
1.472
21
15
14
IP
\*
14
19
18
7
t;
17
n
20
15
14
1*
IP
7
5
17
11
2.492
1.218
1.274
1.671
2.180 16
1.501
1.642
21.379
75.323 21
80.703 19
10.449
8.948
0.538
0.396
0.991
1.104
lfl.66l
52.952 21
40.493 19
1.218
1 .416
2.124
46.723
3.823
44.457
9.883
-------
T3IBUTAPY FLOW INFORMATION FQP IDAHO
OP/P3/76
LAKE CODF 1M1
PAYETTE
MEAN MONTHLY FLOWS AND DAILY FLO--SICMS)
TPIRUTAUY
MONTH
YEAP
FLO*
DAY
FLO«
1611*1
10
11
12
1
2
3
4
5
*,
7
8
9
74
7»
74
75
75
75
75
75
75
75
75
75
o.n?>8
o.oae
0.0?8
0.283
0.170
0.113
0.??7
0.6?3
1.^44
o.7oa
0.113
0.057
?0
1 =
U
is
l1^
14
'19
1 =<
7
c;
17
1?
n
0
0
0
0
o
0
0
1
1
0
0
.023
.031
.031
.680
.142
.085
.198
.934
.982 21
.529 19
.085
.057
1.218
0.311
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STO=£T
•iATl EUT»OPU>IC4TIO'
E P A - L A S VEGAS
161101
44 55 35.0 116 06 37.0
LO«EP PAYETTE
160?5 IDAHO
TO
OF-
DAY
75/06/04 10
1 n
10
10
10
10
10
75/18/01 08
08
08
08
ne
08
08
75/09/16 14
14
14
14
14
14
14
14
'E DEPTH
FEET
05 0000
05 000^
05 001^
05 0035
05 0075
05 0115
05 0165
00 0000
00 0005
00 0015
00 0030
00 0070
00 0120
00 017C
40 0000
40 000^
40 0015
41 0027
41 0055
40 0090
40 0130
40 0175
00010
TF.MP
CENT
7.6
7.4
4.7
4. a
3.7
3.5
3.4
14.4
14.3
14.?
4.6
1.6
0.9
0.6
17. 9
17.8
16.7
9.3
6.4
5.4
5.0
4.7
00300 00077 C009<*
DO TR«,\iSP CNDUCTVY
SECCHI FIELD
KG/L INCHES MICPOMHO
10
9
Q
Q
p.
a
9
7
8
10
8
6
7
7
8
8
10
8
3
8
7
.0 138
.6
.6
.2
.6
.4
.8
.6
.0
.6
.1
.2
.6
.9 264
.6
.0
.2
.2
.2
.0
.8
16
20
18
18
22
20
18
20
21
19
18
16
18
17
16
IIEPALE; 2111202
0999 FEET DEPTH CLASS 00
00400 00410 00610 00625 006"»0 00671
PH T ALK NM3-N TOT KJEL N02«,N(13 PnQS-DIS
CAC03 TOTAL N N-TOTAL QBTHO
SU
7
7
7
7
7
6
7
7
7
7
7
7
7
7
7
7
7
6
6
6
6
6
.50
.60
.30
.25
.01
.95
.05
.30
.40
.45
.40
.20
.10
.13
.10
.40
.10
.85
.65
.55
.60
.50
MG/L
IS
15
15
15
13
11
10K
IS
16
16
15
16
17
18
10K
10K
10
10
10
11
10
10
MG/L
0.040
0.040
0.030
0.040
0.040
0.030
0.020
0.020
0.040
O.OS>0
0.020
0.020
0.0?0
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
MG/L MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.200K
.?OOK
.200
.300
.200
.200K
.200K
.500
.200K
.200*
.200K
.200K
.200K
.200K
.200K
.200K
.200K
.?OOK
,200<
.200K
.200K
.200K
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
o.
0.
0.
020K
020K
020K
030
040
040
030
020K
020K
020K
020K
040
040
040
020K
020K
020K
020K
020K
030
040
o=;o
MG/L P
0.016K
0.013K
0.012J
0.016K
0.013K
0.011J
0.013
0.008
0.009
O.OOR
0.009
0.002
0.006
0.009
0.004
0.002K
0.002K
0.013
0.002K
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
STOOET RETRIEVAL GATE 76/08/25
NATL FUTPOPHICATION SURVEY
EPA-LAS VEGAS
161101
44 55 35.0 116 06 37.0 3
LO*ES PftYETTE
16085 IDAHO
11EPALES
0999 FEET
DEPTH
?111202
CLASS 00
DATE
FROM
TO
75/06/04
75/08/01
75/09/16
TIME C
OF
00665 32217 00031
)EPT"-> PnOS-TOT CHL^PHYL IMCOT LT
HAY FEET
10
10
10
10
10
10
10
08
08
08
08
08
08
08
1*
14
14
14
14
14
14
14
05
05
05
05
05
05
05
00
00
00
00
00
00
00
40
40
40
40
40
40
40
40
0000
0005
0015
0035
007*
0115
0165
0000
000*
0015
0030
0070
0120
0175
0000
0005
0015
0027
0055
0090
0130
0175
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.014
.012
.013
.013
.011
.011
.012
.116
.012
.009
.010
.007
.019
.010
.031
.023
.020
.019
.018
.014
.015
.022
UG/L PFRCFNT
3.0
6.2
4.6
-------
STO'ET RETRIEVAL DATE 76/08/25
NATL EUTROPhlCATION SURVEY
F.PA-LAS VEGAS
161103
44 58 20.0 116 04 00.0 3
LOrtER PAYETTE
16085 IDAHO
DATE
TO
75/06/04
75/Ofl/Ol
75/09/16
00010
TIME DEPTH WATER
OF TFMP
DAY FEET
10
10
10
10
10
10
10
07
07
07
07
07
07
07
13
13
13
13
13
13
13
13
45
45
45
45
45
45
45
00
00
00
00
00
00
00
50
50
50
50
50
50
50
50
0000
0005
0015
0036
0075
0115
0165
0001
0005
0015
0025
0070
0120
0170
0000
0005
0015
0030
0075
0115
0140
0175
CENT
4.2
3.8
3.5
3.2
3.2
3.1
3.1
13.9
U.I
13.6
6.3
1.8
1.3
1.0
16.5
16.4
15.3
14.4
6.4
5.7
5.5
5.2
11EPALES
2111
0999 FEET DEPTH CLASS
00300
00
MG/L
9.4
9.4
9.4
9.4
9.2
9.8
10.0
5.4
7.6
8.2
9.4
9.6
9.0
8.0
8.2
8.2
8.6
8.7
9.2
9.0
9.0
9.1
00177 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
492
481
17
16
17
18
19
18
264 16
18
18
17
14
15
15
14
00400
PH
su
7.05
7.05
7.05
7.10
7.10
7.15
7.00
8.35
8.40
8.00
7.55
7.35
7.20
7.15
8.10
7.80
7.50
7.35
7.10
7.95
7.50
7.10
00410
T ALK
CAC03
MG/L
11
17
12
1?
12
13
13
149
15
14
13
11
12
10
10
11
11
13
10
11
11
12
00610
NH3-N
TOTAL
MG/L
0.030
0.040
0.030
0.030
0.040
0.030
0.030
0.060
0.020
0.020K
0.020
0.040
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
.2(12
00
00625
TOT KJEL
N
MG/L
0.300
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.400
0.200K
0.200K
0.200K
0.200*
0.200K
0.200K
0.200K
0.200K
0.200K
0.300
0.300
0.300
O.ZOOK
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.050
0.060
0.060
0.060
0.070
O.P70
0.060
0.080
0.020K
0.020K
0.020
0.050
0.060
0.060
0.020K
0.020K
0.020K
0.020
0.040
0.050
0.060
0.060
00671
PHOS-DIS
OPTHO
MG/L P
0.015K
0.013K
0.004
0.013K
0.004
0.010K
0.009J
0.033J
0.012K
0.010K
0.008J
0.007K
0.006J
0.007J
0.002K
0.002K
0.00?
0.002
0.002
0.002
0.002
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
STOPtT RETRIEVAL DATE 76/OS/P5
NATL F.UTROP-UCATIOV'
EPA-LAS VEGAS
161102
44 58 20.0 116 04 00.0 3
LOWER PAVETTE
16085 IDAHO
11EPALES
0999 FEET
DEPTH
P111202
CLASS 00
DATE
FRO"
TO
75/06/04
75/08/01
75/09/16
00665 32217 00031
TIME DEPTH PMOS-TOT CHL&PHYL INCDT IT
OF A OFMNING
DAY FEET
10
10
10
10
10
10
10
07
07
07
07
07
07
07
13
13
13
13
13
13
13
13
45
45
45
45
45
45
45
00
00
00
00
00
00
00
50
50
50
50
50
50
50
50
0000
0005
0015
0036
007*
0115
0165
0000
0005
001*
0025
0070
0120
0170
0000
000*
0015
0030
0075
0115
0140
0175
MG/L P UG/L PERCENT
0.
0,
0.
0.
0,
0.
0.
0,
0,
0.
0.
0.
0.
0,
0.
0.
0.
0.
0,
0,
0,
0,
,012 3.3
,009
,009
,009
,009
,009
,010
,058 2.6
,010
,008
.008
.006
,006
,007
.026 3.7
.025
.024
.023
.013
.016
,019
.022
-------
STO=ET RETRIEVAL CiTE 76/08/25
NATL
EPA-LAS VEGAS
161103
44 56 45.0 116 03 55.0 3
LOWER PAYETTE
16085 IDAHO
00010
DATE TIME DEPTH *ATER
FPOM OF TEMP
TO DAY FEET CENT
75/06/04 11 20 0000 9.5
11 20 0005 7.4
11 20 0015 6.3
11 20 003« 4.3
11 20 0075 3.4
11 20 Oil" 3.2
75/08/01 07 30 0000 15.3
07 30 0005 15.]
07 30 0020 15.0
07 30 0030 4.7
07 30 0065 2.1
07 30 0106 1.5
75/09/16 14 20 0000 17.7
14 20 0005 17.6
14 20 001^ 16.9
14 ?>o 0027 15.0
14 20 0060 6.3
14 20 0098 6.0
00300
DO
11 .0
9.6
9.4
9.4
9.4
8.8
9.8
7.6
7.8
7.4
10.6
8.2
8.0
8.1
8.5
8.8
9.0
8.1
11EPALES 2111202
0114 FEET DEPTH CLASS
00077
TRANSD
SECCHI
INCHES
284
156
264
00094
CNDUCTVY
FIELD
MICRGMHO
17
14
15
16
16
18
18
18
19
19
19
23
00400
PH
su
7.50
7.40
7.20
7.10
7.00
6.80
7.20
7.30
7.25
7.00
6.90
6.70
8.00
7.65
7.50
7.35
7.00
6.80
00410
T ALK
CAC03
MG/L
14
14
10K
10
11
12
10
12
12
13
14
12
13
10K
10K
10K
10K
10K
00610
NH3-N
TOTAL
MG/L
0.040
0.040
0.030
0.030
0.030
0.040
0.020
0.020
0.020
0.020
0.040
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
0.020
00
00625
TOT KJEL
M
MG/L
0.200K
0.200
0.300
0.300
0.200K
0.200
0.200
0.200K
0.200
0.200
0.400
0.400
0.200K
0.200K
0.200K
0.200K
0.200K
0.400
00630
N02&N03
N-TOTAL
MG/L
0.050
0.0*0
0.030
0.040
0.040
0.050
0.020K
0.020K
0.020K
0.020
0.050
0.050
0.020K
0.020K
0.020K
0.020K
0.040
0.040
00671
PHOS-DIS
03THO
MG/L P
0.014K
0.011K
0.011K
0.010K
0.011J
0.012J
0.007J
0.007K
0.006J
0.008J
0.018
0.009
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
DATE
FPOM
TO
75/06/04
75/08/01
75/09/16
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF A PEMNING
DAY FEET
11
11
11
11
11
11
07
07
07
07
07
07
14
14
14
14
14
14
20
20
20
20
20
?0
30
30
30
30
30
30
20
ao
20
20
20
20
0000
0005
001^
0038
0075
0110
0000
000^
0020
0030
0065
010*
ooon
000C'
0015
0027
0060
009«
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.009
.OOR
.009
.008
.013
.039
.008
.005
.006
.008
.043
.070
.017
.020
.017
.024
.017
.301
UG/L PERCENT
1.4
13.8
2.8
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
STORET RETRIEVAL DATE 76/08/25
\'ATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02J.N03
FRO" OF
TO DAY FEET
74/10/20
74/11/15
74/12/14
75/01/18
75/02/15
75/03/14
75/04/19
75/05/18
75/06/07
75/06/21
75/07/05
75/07/19
75/08/17
75/09/13
15
11
12
10
18
08
15
10
14
08
07
07
16
16
05
30
00
30
00
30
30
00
10
00
50
20
00
00
1611A1
44 54 30.0 lift 07 10.0 4
N FORK PAYETTE RIVER
16 VALLEY CO HWY MP
0/PAYETTE LAKE
HWY 55 B«DG IN MCCALL
11EPALES 2111304
0000 FEET DEPTH CLASS 00
0630
J.N03
OTAL
G/L
0.008
0.040
0.008
0.012
0.015
0.005
0.020
0.020
0.005
0.005
0.005
0.005
0.005
0.002
00625
TOT KJEL
N
MG/L
0.100K
0.100K
0.300
1.100
0.300
0.050
O.BOO
0.500
0.050K
0.200
0.350
0.100
0.800
0.200
00610
KJH3-N
TOTAL
MG/L
0.015
0.015
0.010
0.005
0.024
0.015
0.025
0.020
0.025
0.020
0.015
0.015
0.015
0.002
00671
PHOS-DIS
ORTHO
MG/L P
0.005K
0.005K
0.005K
0.005K
O.OOBK
0.005K
0.005K
0.005K
0.005K
0.005K
0.010
0.005K
0.010
0.005K
00665
PHOS-TOT
MG/L P
0.005K
0.010K
0.020
0.010K
0.010K
0.010K
0.010K
0.010K
0.020
0.010K
0.010
0.010K
0.040
0.015
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02J.N03
FROM OF
TO DAY FEET
74/10/20
74/11/15
74/12/14
75/01/18
75/05/18
75/06/07
7?/06/21
75/07/05
75/07/19
75/09/17
75/09/13
14
13
10
09
10
15
09
09
09
11
16
00
00
30
on
25
45
30
32
00
00
35
1611A2
45 00 30.0 116 03 30.0 4
N FORK PAYETTE RIVER
16 VALLEY CO HWY MP
T/PAYETTE LAKE
1307Q2
SEC RD 8RDG 8 MI N OF MCCALL
11EPALES 2111204
COCO FEET DEPTH CLASS 00
0630
J.N03
OTAL
G/L
0.048
0.040
0.048
0.080
0.175
0.065
0.022
0.005
0.005
0.015
0.010
00625
TOT KJEL
N
MG/L
0.100*
0.200
0.500
0.600
0.250
0.300
0.500
0.750
0.550
0.075
0.200
00610
NH3-N
TOTAL
MG/L
0.020
0.010
0.010
0.040
0.025
0.045
0.032
0.020
0.022
0.010
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.005K
0.005K
0.005K
0.005K
0.005K
0.005
0.005K
0.005
0.005K
0.005
0.005K
00665
PHOS-TOT
MG/L P
0.006
0.010K
0.010
0.040
0.010K
0.020
0.010K
0.010K
0.010K
0.010K
0.005
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
NATL EUTROPMICATION SU9VEY
EPA- LAS VEGAS
DATE TIME DEPTH N02J.N03
FROM OF
TO DAY FEET
74/10/20
74/11/15
74/12/U
75/01/18
75/02/15
75/03/14
75/04/19
75/05/18
75/06/07
75/06/21
75/07/05
75/07/19
75/08/17
75/09/13
14
12
10
10
20
07
16
10
15
12
08
08
13
16
30
30
00
On
00
30
00
45
15
50
40
10
00
25
1611B1
44 59 00.0 116 03 30.0 4
HORSE CREEK
16 VALLEY CO HHY MP
T/PAYETTE LAKE
SEC RD 3906 8POG 6 MI N OF MCCALL
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
J.N03
OTAL
G/L
0.04B
0.120
0.224
0.256
0.249
0.350
0.450
0.660
0.270
0.110
0.020
0.025
0.030
0.060
00625
TOT KJEL
N
MG/L
0.200
0.100K
0.500
0.200
0.200
0.500
0.400
0.425
0.350
0.300
0.350
0.200
1.350
0.250
00610
NH3-N
TOTAL
MG/L
0.010
0.015
0.015
0.012
0.016
0.015
0.015
0.035
0.025
0.015
0.015
0.015
0.025
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.005K
0.005K
0.005K
0.005K
0.008K
0.005K
0.005K
0.005
0.005
0.005K
0.005
0.005K
0.005
0.002
00665
PHOS-TOT
MG/L P
0.005K
0.010K
0.010
0.010K
0.020
0.010K
0.010K
0.010K
0.030
0.010K
0.010K
0.010K
0.020
0.010
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATIOM SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&N03
FRO* OF
TO DAV FEET
75/06/07 16 00
75/06/21 10 10
75/07/05 10 00
75/07/19 10 00
75/08/17 09 00
75/09/13 17 45
1611C1
45 00 00.0 116 03 30.0 4
ELIP CREEK
16 VALUE* CO "WY MP
T/PAYETTE LAKE 130792
SEC RO BRDG 7 »l N OF MCCALL
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
G/L
0.055
0.005
0.005
0.010
0.030
0.015
00625
TOT KJEL
N
MG/L
0.525
0.400
0.300
0.150
0.150
0.050
00610
NH3-N
TOTAL
MG/L
0.025
0.015
0.015
0.015
0.015
0.002
00671
PHOS-OIS
ORTHO
MG/L P
0.005K
0.005*
0.005K
0.005K
0.005K
0.005K
00665
PHOS-TOT
MG/L P
0.010K
0.010
0.010K
0.010K
0.010K
0.020
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOBET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
1611D1
44 57 20.0 116 03 30.0 4
FALL CREEK
16 VALLEY CO H*Y MP
T/PAYETTE LAKE
SEC RO RPDG A «I ME OF MCCALL
11EPALES ?111204
0000 FEET DEPTH CLASS 00
DATE
FROM
TO
74/10/20
74/11/15
74/12/14
75/01/18
75/02/15
75/03/14
75/04/19
75/05/18
75/06/07
75/06/21
75/07/05
75/07/19
75/OS/17
75/09/13
00^30 00625
TIME DEPTH N02S.N03 TOT KJEL
OF N-TOTAL N
DAY FEET
13
13
12
11
11
09
12
09
1ft
11
11
10
08
17
15
30
45
45
00
30
00
45
30
00
00
00
00
10
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.040
.040
.096
.128
.120
.110
.115
.170
.055
.015
.005
.010
.020
.015
MG/L
0.
0.
0.
0.
0.
1.
1.
0.
0.
0.
0.
0.
0.
0.
100K
200
100
600
200
050
250
650
500
250
250
250
250
100
00610 00671 00665
MH3-M PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
015
015
015
010
008
020
035
015
025
010
010
010
015
010
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P MG/L P
015
015
005K
005K
OOBK
005K
OOBK
010
005K
Oil
005K
010
015
010
0.015
0.015
0.010
0.010K
0.020
0.010K
0.010K
0.010
0.020
0.019
0.010
0.010
0.040
0.015
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 DWOHSHAK RESERVOIR
1605 HAUSER
1606 HAYDEN LAKE
1607 ISLAND PARK RESERVOIR
1608 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 DO
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
OISS 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
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
1601 AMERICAN FALLS RESERVOIR
1602 CASCADE LAKE
1603 LAKE COEUR D'ALENE
1604 DWORSHAK RESERVOIR
1605 MAUSER
160-6 HAYOEN LAKE
1607 ISLAND PARK RESERVOIR
1608 LAKE LOWELL
1609 MAGIC RESERVOIR
1610 PALISADES RESERVOIR
1611 LOWER PAYETTE
1612 LOrfER TWIN LAKES
1613 UPPER TWIN LAKES
MEDIAN
TOTAL P
0 (
33 (
67 (
96 (
42 (
96 (
25 (
8 (
17 (
50 (
83 (
75 (
58 (
0)
4)
8)
11)
5)
11)
3)
1)
2)
6)
10)
9)
7)
MEDIAN 500-
INORG N MEAN SEC
17 <
54 <
96 (
17 <
33 <
96 (
71 (
42 1
0 (
17 1
54 i
71 i
83 '
1)
6)
11)
1)
4)
: ii)
I 8)
I 5)
I 0)
1 1)
t 6)
( 8) .
( 10)
8 (
17 (
50 (
25 (
75 <
92 (
42 (
0 1
33 1
83 I
100 i
58 i
67 i
1)
2)
6)
3)
9)
: ID
! 5)
! 0)
I 4)
[ 10)
I 12)
I 7)
( 8)
MEAN
CHLORA
. 8
42
25
83
17
75
33
0
50
100
67
92
58
( 1)
( 5)
( 3)
( 10)
( 2)
( 9)
( 4)
( 0)
( 6)
( 12)
( 8)
I 1U
{ 7)
15-
MIN
21 (
4 (
67 (
100 (
4 (
75 <
54 <
33 ^
21 <
54 1
83 <
42 (
92 i
00
2)
0)
8)
12)
0)
: 9)
; 6)
: 4)
I 2)
I 6)
[ 10)
I 5)
( 11)
MEDIAN
OISS ORTHO
0
50
83
50
25
100
33
17
6
75
67
50
92
(
(
(
(
(
(
<
(
(
(
(
(
(
0)
5)
10)
5)
3)
12)
4)
2)
1)
9)
8)
5)
11)
------- |