U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
HAUSER LAKE
KOOTENAI COUNTY
IDAHO
EPA REGION X
WORKING PAPER No, 780
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
HAUSER LAKE
KOOTBIAI COUNTY
IDAHO
EPA REGION X
WORKING PAPER No, 780
WITH THE COOPERATION OF THE
IDAHO DEPARTMENT OF HEALTH AND WELFARE
AND THE
IDAHO NATIONAL GUARD
JULY, 1977
-------
REPORT ON HAUSER LAKE
KOOTENAI 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. 780
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
-------
CONTENTS
Page
Foreword i i
List of Idaho Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Introduction 1
II. Conclusions 1
III. Lake Characteristics 3
IV. Lake Water Quality Summary 4
V. Literature Reviewed 11
VI. Appendices 12
-------
ii
FOREWORD
The National Eutroph1cat1on Survey was Initiated 1n 1972 1n
response to an Administration commitment to Investigate the nation-
wide threat of accelerated eutrophlcatlon to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concen-
trations, and impact on selected freshwater lakes as a basis for
formulating comprehensive and coordinated national, regional, and
state management practices relating to point source discharge
reduction and nonpoint source pollution abatement 1n lake water-
sheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophlcatlon analysis are based on related concepts
that:
a. A generalized representation or model relating
sources, concentrations, and impacts can be
constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized
model can be transformed Into an operational
representation of a lake, its drainage basin, and
related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and
watershed data collected from the study lake and its drainage
basin is documented. The report is formatted to provide state
environmental agencies with specific information for basin
planning [§303(e)L water quality criteria/standards review
[§303(c]], clean lakes [§314(a,bj], 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.
-------
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
-------
Map Location
MAUSER LAKE
X Lake""Sampling Site
o 1 2 Km";
I i
CO
a:
/ (
I' V
I
1
i Mi".
Scale
\
\
\
117° 04'
V
47° 50'
r
Mauser
47° 46'
117°00'
-------
REPORT ON MAUSER LAKE, IDAHO
STORE! NO. 1605
I. INTRODUCTION
Mauser Lake was included in the National Eutrophication
Survey (NES) as a water body of special interest to the Idaho
Department of Health and Welfare. Tributaries and nutrient
sources were not sampled, and this report relates only to the
data obtained from lake sampling.
II. CONCLUSIONS
A. Trophic Condition:*
Based upon Survey data, Hauser Lake is considered
eutrophic, i.e., nutrient rich and highly productive.
Whether such nutrient enrichment is to be considered bene-
ficial 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 1.8 ug/1
to 35.6 yg/1 with a mean of 11.1 yg/1. Hypolimnetic oxygen
levels in the lake were severely depressed during September,
and the potential for primary productivity as measured by
algal assay control yields was high during September and
October. Of the 13 Idaho lakes sampled in 1974, 5 had higher
median total phosphorus, 4 had higher median inorganic
nitrogen and 3 had higher median orthophosphorus levels than
*See Appendix C.
-------
Mauser Lake; ammonia and phosphorus were especially high in the
hypolimnion at Station 01 during September and October.
Survey limnologists reported algal blooms and floating
algal mats throughout the lake in June and July, as well as
some floating aquatic macrophytes (water lilies, duckweed).
Other studies (Idaho Department of Water Resources, et al. 1975)
indicate poor water quality in Mauser Lake can be mainly attri-
buted to excessive residential development with inadequate
septic systems, and agricultural runoff.
B. Rate-Limiting Nutrient:
The algal assay results indicate Mauser Lake was limited
by available phosphorus during June sampling, but by nitrogen
during September and October assay sample collections. The lake
data suggest primary limitation by nitrogen on all sampling
occasions.
-------
III. LAKE CHARACTERISTICS
A. Lake Morphometry:*
2
1. Surface area: 2.43 km .
2. Mean depth: 1.2 meters.
3. Maximum depth: 12.2 meters.
4. Volume: 2.837 x 106 m3.
B. Precipitation:
1. Year of sampling: 86.1 cm.
2. Mean annual: 84.2 cm.
*Lake surface area, mean depth and volume provided by Herman Ray
(1976). Maximum depth was estimated on the basis of National
Eutrophication Survey (NES) sampling data.
-------
IV. LAKE WATER QUALITY SUMMARY
Mauser Lake was sampled four 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
two 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 10.7 meters at Station 01 and 7.3 meters
at Station 02. For a more detailed explanation of NES methods, see
NES Working Paper No. 175.
The results obtained are presented in full in Appendix B 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
chlorophyll a_ determinations are included in III-B. Results of the
limiting nutrient study are presented in III-C.
-------
HAUSEo
PARAMETER
PHYSICAL AND CHEMICAL CHARACTERISTICS
( 10/23/75 )
"MX
S«o* = t OEPTn
TEMPEPATU^E (OEG
O.-l.^ u DEPTH
MAX DFPTH**
DISSOLVED OXYGEN
0.-1.5 M HEPTH
MAX DEPTH**
CONDUCTIVITY UIMH
0.-1.5 M DEPTH
MAX DEPTH**
CFNT)
4
2
(MG/L)
4
2
0^)
4
2
11.7-
9.0-
7.2-
0.6-
43.-
53.-
11 .9
11.3
7.8
7.8
46.
64.
11. <^
10. i
7.5
4.2
45.
59.
0
7
0
7
0
7
.0-
.3-
.0-
.3-
.0-
.3-
1
10
1
10
1
10
.5
.7
.5
.7
.5
.7
PH (STANDARD UNITS)
n.-l.S M OFPTH
MAX DEPTH**
TOTAL ALKALINITY
0.-1.5 M DEPTH
MAX DEPTH**
TOTAL P (MG/D
0.-1.5 M DEPTH
MAX DEPTH**
DISSOLVED O&THO P
0.-1.5 M DEPTH
MAX DEPTH**
N02+N03 (MG/L)
0.-1.5 M DEPTH
MAX DEPTH**
AMMONIA (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
KJELOAHL N (MG/L)
0.-1.5 M DEPTH
MAX DEPTH**
4
2
(MG/L)
4
2
4
2
(MG/L)
4
2
4
2
4
2
4
2
7.1-
6.9-
20.-
18.-
0.029-0
0.026-0
0.010-0
0.007-0
0.020-0
0.020-0
0.070-0
0.070-0
0.400-0
0.400-1
7.8
7.1
32.
28.
.043
.632
.016
.454
.020
.030
.090
.890
.400
.200
7.3
7.0
24.
23.
0.0^3
0.329
0.01.3
0.230
0.0?0
0.0?b
O.ORO
O.'flO
0.400
0.800
n
7
0
7
0
7
0
7
0
7
0
7
0
7
.0-
.3-
.0-
.3-
.0-
.3-
.0-
.3-
.0-
.3-
.0-
.3-
.0-
.3-
1
10
1
10
1
10
1
10
1
10
1
10
1
10
.5
.7
.5
.7
.5
.7
.5
.7
.5
.7
.5
.7
.5
.7
SECCHI DISC (METEWS)
2.7- 3.n
» N = NO. OF
»» MAXIMUM DEPTH SAMPLED AT EACH SITE
»»» s = NO. OF SITES SAMPLED ON THIS DATE
-------
STORET CODE 1605
PARAMETER
N«
PHYSICAL AND CHEMICAL CHARACTERISTICS
( 6/ 3/75 ) ( 7/23/75 )
MAX HAX
= ? OEPTH S*«« = 2 OEPTH
BAN'GE ' RANGE
MEDIAN (DETERS) M* RANGE MEDIAN (METERS)
N*
( 9/10/75 )
S»«o = 2 DEPTH
RANGE
RANGE MEDIAN (METERS)
TEMPEPATUPE (DEG CFMT)
O.-l.S M DEPT*
MAX DEPTH**
DISSOLVED OXYGEN
O.-l.S M DEPTH
MAX DEPTH**
4
2
4
CONDUCTIVITY (UMHOS)
O.-l.S M DEPTH 4
MAX DEPTH** 2
PH (STANDARD UNITS)
O.-t.S M DEPTH 4
MAX DEPTH** 2
TOTAL ALKALINITY
O.-l.S M DEPTH
MAX DEPTH**
TOTAL P (MG/L)
0.-1.5 M DEPTH
MAX DEPTH**
DISSOLVED ORTHO P
O.-l.S M DEPTH
MAX DEPTH**
N02+N03 (MG/L)
0.-1.5 M DEPTH
M.AH DEPTH**
AMMONIA (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
KJELDAHL N (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
(MG/L)
4
2
4
2
(MG/L)
4
2
' 4
2
4
2
4
2
15.8-
6.2-
8.*-
6.6-
38.-
34.-
7.8-
7.1-
23.-
15.-
0.024-0
0.028-0
0.011-0
0.013-0
0.020-0
0.020-0
0.040-0
0.030-0
0.300-0
0.400-0
16.4
8.6
9.2
6.8
40.
35.
8.3
7.5
24.
26.
.040
.033
.024
.013
.080
.020
.170
.040
.600
.400
16.1
7.4
::;
40.
35.
8.0
7.3
24.
21.
0.0?7
0.030
0.014
0.015
0.045
0.0?0
0.045
0.035
0.400
0.400
0.0- 1.5
7.3- 10.4
1.0- 1.5
7.3- 10.4
0.0- 1.5
7.3- 10.4
0.0- 1.5
7.3- 10.4
0.0- 1.5
7.3- 10.4
0.0- 1.5
7.3- 10.4
0.0- 1.5
7.3- 10.4
0.0- 1.5
7.3- 10.4
0.0- 1.5
7.3- 10.4
0.0- 1.5
7.3- 10.4
3
2
3
2
3
2
3
2
3
2
3
3
2
3
2
3
2
3
2
27.4- 27.5
10.9- 13.8
8.4- 9.2
8.8- 9.2
48.- 52.
38.- 42.
8.2- 8.6
7.2- 7.6
19.- 24.
22.- 23.
0.012-0.012
0.011-0.015
0.012-0.013
0.015-0.037
0.020-0.030
0.020-0.110
0.030-0.040
0.030-0.160
0.300-0.400
0.300-0.300
27.5
12.3
9.0
9.0
51.
40.
8.3
7.4
20.
23.
0.012
0.013
0.012
0.026
0.020
0.065
0.040
0.095
0.300
0.300
0.0-
6.7-
0.0-
6.7-
0.0-
6.7-
0.0-
6.7-
0.0-
6.7-
0.0-
6.7-
0.0-
6.7-
0.0-
6.7-
0.0-
6.7-
0.0-
6.7-
1.5
9.4
1.5
9.4
1.5
9.4
1.5
9.4
1.5
9.4
1.5
9.4
1.5
9.4
1.5
9.4
1.5
9.4
1.5
9.4
4
2
4
2
3
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
1*.9- 15.4
4.4- 10.3
8.6- 9.6
0.2- 1.8
33.- 34.
33.- 42.
7.5- 8.5
7.1- 7.2
21.- 24.
25.- 31.
0.017-0.035
0. 048-0. 350
0.003-0.011
0.014-0.255
0.020-0.020
0.020-0.020
0.020-0.020
0.020-0.400
0.300-0.400
0.400-0.800
15.1
7.3
9.2
1.0
33.
38.
7.8
7.1
23.
28.
0.019
0.199
0.007
0.134
0.020
0.020
0.020
0.210
0.350
0.600
0.0- 1.5
6.7- 10.1
0.0- 1.5
6.7- 10.1
0.0- 1.5
6.7- 10.1
0.0- 1.5
6.7- 10.1
0.0- 1.5
6.7- 10.1
0.0- 1.5
6.7- 10.1
0.0- 1.5
6.7- 10.1
0.0- 1.5
6.7- 10.1
0.0- 1.5
6.7- 10.1
0.0- 1.5
6.7- 10.1
SECCHI DISC
2.9- 3,.2
3.0
4.3- 4.3
4.3
3.0- 4.6 3.8
* N = NO. OF SAMPLES
»» MAXIMUM DEPTH SAMPLED AT EACH SITE
«»» s = NO. OF SITES SAMPLED ON THIS DATE
-------
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
06/03/75
07/23/75
09/10/75
10/23/75
Dominant
Genera
1. Cryptomonas
2. Ankistrodesmus
3. Unidentified cell
4. Nitzschia
Other genera
Total
1. Chroomonas
2. Tabellaria
3. Asterionella
4. Cryptomonas
5. Dinobryon
Other genera
Total
1. Aphanizomenon
2. Melosira
3. Euglena
4. Chlamydomonas
5. Tabellaria
Other genera
Total
1. Cryptomonas
2. Chroomonas
3. Melosira
4. Schroederia
5. Mallomonas
Other genera
Total
Algal
Units
per ml
459
153
92
61
765
260
186
74
74
74
112
780
2,225
805
284
189
189
568
4,260
217
186
186
186
62
29_
866
-------
2. Chlorophyll a^ -
Sampling
Date
06/03/75
07/23/75
09/10/75
10/23/75
Station
Number
01
02
01
02
01
02
01
02
Chlorophyll a
(yg/D
1.8
1.9
18.0
11.1
35.6
11.8
6.1
2.6
-------
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked
a. 06/03/75
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
b. 09/10/75
Ortho P
Cone, (mg/1)
0.010
0.060
0.060
0.010
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
c. 10/23/75
Ortho
Cone.
P
(mg/1)
0.045
0.095
0.095
0.045
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
Ortho
Cone.
P
(mg/1)
0.095
0.145
0.145
0.095
Inorganic N
Cone, (mg/1)
0.040
0.040
1.040
1.040
Inorganic N
Cone, (mg/1)
0.190
0.190
1.190
1.190
Inorganic N
Cone, (mg/1)
0.220
0.220
1.220
1.220
Maximum Yield
(mg/1-dry wt.)
0.6
2.0
19.2
0.6
Maximum Yield
(mg/1-dry wt.)
11.6
12.9
37.4
15.6
Maximum Yield
(mg/1-dry wt.)
10.3
10.6
35.8
32.8
-------
10
2. Discussion -
The control yields of the assay alga, Selenastrum capri-
cornutum, indicate that the potential primary productivity in Mauser
Lake was moderate during June sampling, but extremely high during
September and October. In the June assay, a significant increase
in yield occurred when phosphorus was added alone and in combination
with nitrogen indicating phosphorus limitation. The addition of
only nitrogen resulted in a yield which was not significantly greater
than that of the control.
In the September and October assays, the addition of nitrogen
alone produced significant increases in yield over those of the
controls, indicating nitrogen limitation in the lake at those times.
The mean inorganic nitrogen to orthophosphorus ratios (N/P)
in the lake data were less than 6/1 on all sampling occasions, sug-
gesting nitrogen limitation (a mean N/P ratio of 14/1 or greater
generally reflects phosphorus limitation).
-------
11
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
Overview. Boise, Idaho.
Ray, Herman. 1976. Personal communication, (morphometric data
of selected Idaho water bodies). 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 Laboratory, Con/all is, Oregon.
-------
12
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 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 - Ibs/square mile
-------
APPENDIX B
PHYSICAL AND CHEMICAL DATA
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
160501
47 46 38.0 117 00 45.0 3
HAUSER
16055- ID*HO
130391
DATE
TO
75/06/03
75/07/23
75/09/10
75/10/23
00010
TIME DEPTH WATER
OF TEMP
DAY FEET
10
10
10
10
15
15
15
15
15
09
09
09
09
14
14
14
14
35
35
35
35
55
55
55
55
55
15
15
15
15
30
30
30
30
0000
0005
0015
0034
0000
0010
0016
0025
0031
0000
0005
0020
0033
0000
0005
0016
0035
CENT
16
15
10
6
37
35
16
11
10
15
15
12
4
11
11
11
9
2
8
9
2
5
8
3
8
9
4
4
4
4
9
9
8
0
00300
DO
MG/L
a
9
5
6
8
8
2
1
8
8
9
4
0
7
7
10
0
.8
.2
.4
.8
.4
.6
.0
.6
.8
.6
.0
.6
.2
.8
.6
.0
.6
11EPALES 3111303
00300
DO
MG/L
8.8
9.3
5.4
6.8
8.4
8.6
3.0
1.6
8.8
8.6
9.0
4.6
0.3
7.8
7.6
10.0
0.6
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICKOMHO
114 40
38
36
34
48
44
45
39
36
130 34
31
43
108 45
46
43
64
0038
00400
PH
SU
8.00
7.80
7.30
7.50
8.60
8.50
7.40
6.70
7.30
8.50
8.15
7.35
7.10
7.80
7.50
7.35
6.95
FEET DEPTH CLASS
00410
T ALK
CAC03
MG/L
34
33
37
36
34
33
36
37
32
34
21
28
31
31
36
20
28
00610
NH3-N
TOTAL
MG/L
0.170
0.040
0.040
0.040
0.040
0.030
0.090
0.160
0.160
0.030K
0.020K
0.320
0.400
0.070
0.080
0.090
0.890
00
00625
TOT KJEL
N
MG/L
0.300
0.300
O.SOO
0.400
0.300
0.300
0.400
0.400
0.300
0.300
0.300
0.900
0.800
0.400
0.400
0.400
1.200
006TO 00671
N03S.N03 PHOS-DIS
N-TOTAL 09THO
MG/L MG/L P
0.070
0.080
0.080
0.030
0.020K
0.020K
0.060
0.100
0.110
0.030K
0.020K
0.020K
0.030K
0.030
0.020
0.030
0.030K
0.012
0.011
0.031
0.01A
0.012J
0.011J
0.034
0.031
0.037K
0.003
0.008
0.190
0.355
0.010
0.014
0.020
0.454
DATE
FROM
TO
75/06/03
75/07/23
75/09/10
75/10/23
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF A REMNING
DAY FEET
10
10
10
10
15
15
15
15
15
09
09
09
09
14
14
14
14
35
35
35
35
55
55
55
55
55
15
15
15
15
30
30
30
30
0000
0005
0015
0034
0000
0010
0016
0025
0031
0000
0005
0020
0033
0000
0005
0016
0035
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.034
.030
.043
.028
.012
.014
.021
.054
.015
.017
.021
.385
.350
.031
.036
.043
.632
UG/L PERCENT
1.8
18.0
35.6
6.1
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
ST09ET RETRIEVAL DATE 76/08/25
NATL EUTPOPMICATION SURVEY
EPA-LAS VEGAS
00010 00300
DATE TIME DEPTH «ATE» DO
FROM OF TEMP
TO DAf FEET CENT MG/L
00077 00094
THANSP CNDUCTVY
«?ECCHI FIELD
INCHES MICRO
75/06/03
75/07/23
75/09/10
75/10/23
11 00
11 00
11 00
1100
16 15
16 15
16 15
16 15
09 40
09 40
09 40
15 00
15 00
15 00
15 00
0000
0005
0015
0024
0000
0005
0016
0022
0000
0005
0022
0000
0005
0015
0024
16.4
16.1
11.3
8.6
27.5
27.4
18.3
13.8
14.9
14.9
10.3
11.9
11.7
11.7
11.3
8.8
8.8
8.4
6.6
9.2
9.0
6.8
9.2
9.6
.3.4
1.8
7.2
7.4
7.6
7.8
126
168
180
120
160502
47 46 50.0 117 01
MAUSER
16055 IDAHO
00.0 3
130391
11EPALES 2111202
0036 FEET DEPTH CLASS OC
4 00400 00410
VY PH T ALK
CAC03
HO SO MG/L
40
40
36
35
51
52
43
42
33
33
33
44
43
42
53
8.30
8.00
7.80
7.10
8.20
8.35
7.55
7.65
7.50
7.50
7.20
7.10
7.10
7.10
7.10
24
24
25
15
20
19
19
23
22
23
25
32
20
21
18
00610 00625 00630 00671
NH3-N TOT KJEL N02&N03 PHOS-DIS
TOTAL N N-TOTAL ORTHO
MG/L
0.040
0.050
0.030
0.030
0.040
0.030
0.030
0.030
0.020K
0.020K
0.020K
0.090
0.080
0.060
0.070
MG/L
0.600
0.500
0.500
0.400
0.400
0.300
0.400
0.300
0.400
0.400
0.400
0.400
0.400
0.400
0.400
MG/L
0.020K
0.020K
0.020K
0.020K
0.030
0.020K
0.020K
0.020
0.020K
0.020K
0.020K
0.020
0.020
0.020
0.030
MG/L P
0.024
0.017
0.008
0.013
0.013K
0.012J
0.013J
0.015K
0.011
0.006
0.014
0.016
0.013
0.010
0.007
DATE
FROM
TO
75/06/03
75/07/23
75/09/10
75/10/23
TIME DEPTH
OF
DAY FEET
11 00 0000
11 00 0005
11 00 0015
11 00 0024
16 15 0000
16 15 0005
16 15 0016
16 15 0022
09 40 0000
09 40 0005
09 40 0022
15 00 0000
15 00 0005
15 00 0015
15 00 0024
00665
PHOS-TOT
MG/L P
0.04Q
0.025
0.026
0.032
0.012
0.012
0.030
0.011
0.035
0.017
0.048
0.043
0.029
0.025
0.026
32217
CHLRPHYL
A
UG/L
1.9
il.l
11.8
2.6
00031
IMCDT LT
REMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
APPENDIX C
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
1603 CASCADE LAKE
1603 LAKE COEUR D'ALENE
1604 DWORSHAK RESERVOIR
1605 MAUSER
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
8.081
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
MEOI;
OISS ORTf
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 (DUMBER 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 HAUSER
16 hAYDEN LAKE
1607 ISLAND PARK RESERVOIR
1603 LAKE LOWELL
1609 MAGIC RESERVOIR
1610 PALISADES RESERVOIR
1611 LOWER PAYETTE
1612 LOtfER TWIN LAKES
1613 UPPER TWIN LAKES
MEDIAN
TOTAL P
0 <
33 <
67 <
96 (
42 i
96 (
25 1
8 1
17 1
50 I
83 1
75 I
58 1
. 0)
I 4)
: 8)
: ID
: 5)
: ID
! 3)
t 1)
t 2)
1 6)
t 10)
I 9)
! 7)
MEDIAN 500=
INORG N MEAN SEC
17 (
54 1
96 (
17 (
33 (
96 (
71 1
42 <
0 (
17 I
54 1
71 1
83 t
: i>
[ 6)
: ID
! 1)
1 4)
[ 11)
r a)
I 5)
I 0)
I 1)
t 6)
[ 8) .
t 10)
8 (
17 <
50 1
25 1
75 (
92 1
42 1
0 1
33 <
83 i
100 i
58 <
67 i
: i)
: 2)
; 6)
I 3)
t 9)
I 11)
t 5)
I 0)
t 4)
I 10)
( 12)
t 7)
t 8)
MEAN
CHLORA
. 8
42
25
83
17
75
33
0
50
100
67
92
58
( 1)
( 5)
( 3)
( 10)
( 2)
t 9)
( 4)
( 0)
( 6)
I 12)
( 8)
( 11)
< 7)
15-
MIN DO
21 <
4 <
67 <
100 <
4 <
75 \
54 (
33 i
21 <
54 i
83 1
42 <
92 <
: 2)
: 0)
: 8)
: 12)
: o)
: 9)
I 6)
[ 4)
I 2)
1 6)
t 10)
t 5)
1 11)
MEDIAN
OISS ORTHO
0 <
50 (
83 <
50 (
25 (
100 1
33 1
17 (
8 <
75 \
67 (
50 I
92 l
: 0)
; 5)
: 10)
: 5)
; 3)
: 12)
I 4)
I 2)
I 1)
1 9)
( 8)
t 5)
I 11)
------- |