U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
SUTTLELAKE
JEFFERSON COUNTY
OREGON
EPA REGION X
WORKING PAPER No, 833
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
SUTTlf LAKE
JEFFERSON COUNTY
OREGON
EPA REGION X
WORKING PAPER No, 82
WITH THE COOPERATION OF THE
OREGON DEPARTMENT OF ENVIRONMENTAL REGULATION
AND THE
OREGON NATIONAL GUARD
JANUARY, 1978
-------
i
CONTENTS
Page
Foreword ' ii
List of Oregon Lakes and Reservoirs iv
Lake or Reservoir Drainage Area Map v
Sections
I. Conclusions 1
II. Drainage Basin Characteristics 3
III. Water Quality Summary 4
IV. Nutrient Loadings 8
V. Literature Reviewed 12
VI. Appendices 13
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11
FOREWORD
The National Eutrophication Survey was initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concentrations,
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 non-point
source pollution abatement in lake watersheds.
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 eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and water-
shed 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 [§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.
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Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
fresh water 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 EPA
and to augment plans implementation by the states.
ACKNQWLEPMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Oregon Department of Environ-
mental Quality for the professional involvement and to the Oregon
National Guard for conducting the tributary sampling phase of the
the Survey.
William H. Young, Department Director, and Harold L. Sawyer,
Administrator, and the staff of the Water Quality Control Division
provided invaluable lake documentation and counsel during the
Survey, reviewed the preliminary reports, and provided critiques
most useful in the preparation of this Working Paper series.
Brigadier General Richard A. Miller, the Adjutant General
of Oregon, and Project Officer Lt. Colonel John Mewha, who
directed the volunteer efforts of the Oregon National Guardsmen,
are also gratefully acknowledged for their assistance to the
Survey.
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1v
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES and RESERVOIRS
STATE OF OREGON
NAME COUNTY
Brownlee Baker, OR; Washington, ID
Diamond Douglas
Hells Canyon Baker, Wallowa, OR; Adams,
Idaho, ID
Hills Creek Lane
Owyhee Malhuer
Oxbow Baker, OR; Adams, ID
Suttle Jefferson
Waldo Lane
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\
Ti
(
BUTTLE Z./4/CE*44'25'—
Ore.
Map Location
SUTTLE LAKE
Tributary Sampling Site
X Lake Sampling Site
is Drainage Area Boundary
3
Scale
5 Km,
TMI.
121° 50'
121°45'
44°20'
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SUTTLE LAKE
STORE! NO. 4107
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Suttle Lake is meso-eutrophic. It
ranked third in overall trophic quality when the eight Oregon
lakes and reservoirs sampled in 1975 were compared using a
combination of six parameters*. Two of the water bodies had
less median total phosphorus, two had less median dissolved
orthophosphorus, none had less and two had the same median
inorganic nitrogen, four had less mean chlorophyll a_, and
two had greater mean Secchi disc transparency. Significant
depression of dissolved oxygen with depth did not occur at
any sampling time.
B. Rate-Limiting Nutrient:
The results of the algal assay indicate that nitrogen was
the limiting nutrient when the assay sample was taken (03/28/75).
The lake data indicate nitrogen limitation all three sam-
pling times.
C. Nutrient Controllability:
1. Point sources—No known municipal or industrial point
sources impacted Suttle Lake during the sampling year. It is
estimated that septic tanks serving lakeshore dwellings and
campgrounds contributed 0.5% of the total phosphorus load
* See Appendix A.
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2
during the sampling year, but a shoreline survey would be
necessary to determine the significance of those sources.
The present loading of 1.70 g/m2/yr is greater than
that proposed by Vollenweider (Vollenweider and Dillon, 1974)
as a eutrophic load (see page 11). Because of this, all phos-
phorus inputs to the drainage area of Suttle Lake should be
reduced as much as possible to slow the aging of the lake.
2. Non-point sources~Non-point sources, including di-
rect precipitation, contributed 99.5% of the total phosphorus
load to Suttle Lake during the sampling year. The Blue Lake
outlet stream added 81.9% of the total, and the ungaged
tributaries added an estimated 16.5%.
The non-point phosphorus export rate of the Blue Lake
outlet stream was 32 kg/km2/yr (see page 10).
-------
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
A. Morphometry :
1. Surface area: 1.09 kilometers2.
2. Mean depth: 9.9 meters.
3. Maximum depth: 21.0 meters.
4. Volume: 10.791 x 106 m3.
5. Mean hydraulic retention time: 87 days.
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
Blue Lake outlet 46.9 1.350
Minor tributaries &
immediate drainage - 9.5 0.097^
Totals 56.4 1.447
2. Outlet -
Lake Creek 57.5** 1.440
C. Precipitation***:
1. Year of sampling: 30.9 centimeters.
2. Mean annual: 30.8 centimeters.
t Table of metric equivalents—Appendix B.
tt Newcomb, 1941.
* For limits of accuracy, see Working Paper No. 175, "... Survey Methods,
1973-1976".
** Includes area of lake.
*** See Working Paper No. 175.
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4
III. WATER QUALITY SUMMARY
Stittle Lake was sampled three times during the open-water season
of 1974 by means of a pontoon-equipped Huey helicopter. Each time,
samples for physical and chemical parameters were collected from a
number of depths at one station on the lake (see map, page v). Dur-
ing each visit, a single depth-Integrated (4.6 m to surface) sample
was collected for phytoplankton identification and enumeration; and
a similar sample was collected for chlorophyll a^ analysis. During the
first visit, a single 18.9-liter depth-Integrated sample was taken
for algal assays. The maximum depth sampled was 18.9 meters.
The sampling results are presented in full in Appendix D and are
summarized in the following table.
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OARAMETER
TEMP (C)
DISS OXY (MG/L)
CNDCTVY (MC^OMO)
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/L)
ORTHO P (MG/L)
N02»N03 (MG/L)
AMMONIA (MG/L)
KJEL N (MG/L)
INORG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A (Ufi/L)
iECCHI (METERS)
A. SUMMARY OF PHYSICAL AND
1ST SAMPLING ( 3/28/75)
1 SITES
RANGE MEAM r-'EDlAN
2.7 - 3.5 3.4 3.b
11.4 - ll.fi 11.7 11.7
50. - 52. 50. bO.
7.5 - 7.6 7.S 7.5
26. - 30. 28. 27.
0.021 - 0.098 0.035 0.023
0.014 - 0.028 0.021 0.021
0.020 - 0.020 0.020 0.020
0.020 - 0.030 0.02? 0.020
0.200 - 0.300 0.217 0.200
O.u<*0 - 0.050 U.O-+.'1 0.040
0.230 - 0.320 0.237 0.220
1.2 - 1.2 1.2 1.2
CHEMICAL CHARACTERISTICS FOR SUTTLE LAKE
STCRET COOE 4107
2ND SAMPLING ( 7/16/75)
1 SITES
RANGE MEAN MEDIAN
11.1 - 16.8 14.7 16.6
8.2
37.
7.3
25.
0.021
0.007
0.020
0.030
0.200
0.050
0.230
24.9
1.8
- 10.0
47.
9.2
28.
- 0.100
- 0.041
- 0.030
- 0.040
- 0.600
- 0.060
- 0.620
- 24.9
1.8
9.5
42.
8.5
26.
0.042
0.019
0.022
0.034
0.480
0.056
0.502
24.9
1.8
10.0
44.
9.1
26.
0.031
0.014
0.020
0.030
0.500
0.060
0.520
24.9
1.8
3RD SAMPLING (10/31/75)
1 SITES
RANGE MEAN MEDIAN
9.7 - 10.2 10.0 10.1
8.8 - 9.0 8.8 8. a
46. - 57. 49. 47.
7.3 - 7.4 7.3 7.3
36. - 38. 37. 38.
0.046 - 0.111 0.063 0.048
0.013 - 0.025 0.016 0.014
0.020 - 0.020 0.020 0.020
0.020 - 0.020 0.020 0.020
0.200 - 0.200 0.200 0.200
0.040 - 0.040 0.040 0.040
0.220 - 0.220 0.220 0.220
1.4 - 1.4 1.4 1.4
3.7 - 3.7 3.7 3.7
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B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
03/28/75
07/16/75
10/31/75
Dominant
Genera
1.
2.
3.
1.
2.
1.
2.
3.
4.
5.
Melosira sp.
Dactylococcopsis sp.
Synedra sp.
Total
Anabaena sp.
AsterioneTTa sp.
Total
Stephanodiscus sp.
Fragilaria sp.
Chroomonas T?) sp.
Cryptqmonas sp_.
Asterionella sp.
Other genera
Algal Units
per ml
1,374
153
38
1,565
1,263
90
1,353
637
495
283
106
35
142
2. Chlorophyll a_ -
Total
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
1,698
Sampling
Date
03/28/75
07/1 6/75
10/31/75
Station
Number
1
1
1
Chlorophyll a
(yg/D
1.2
24.9
1.4
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Ortho P
Cone, (mg/1)
0.018
0.068
0.068
0.018
Inorganic N
Cone, (mg/1)
0.012
0.012
1.012
1.012
Maximum yield
(mg/l-dry wt.)
0.4
0.4
17.8
5.8
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7
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum, indicates that the potential primary productivity
of Suttle Lake was moderate at the time the sample was
taken (03/28/75). The addition of nitrogen alone produced
a significant increase in yield, but no such increase
occurred with the addition of only phosphorus. Therefore,
limitation by nitrogen is indicated.
The lake data indicate nitrogen limitation all three
sampling times; i.e., the mean inorganic nitrogen to
orthophosphorus ratios were 2 to 1 in March, 3 to 1 in
July, and 3 to 1 in October.
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8
IV. NUTRIENT LOADINGS
(See Appendix E for data)
For the determination of nutrient loadings, the Oregon National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page v). Sampling 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 Oregon District Office of the U.S. Geological Survey for the
tributary sites nearest the lake.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of a U.S. Geological Survey com-
puter program for calculating stream loadings*. Nutrient loads for
unsampled "minor tributaries and immediate drainage" ("ZZ" of U.S.G.S.)
were estimated using the nutrient loads at station B-l, in kg/km2/year,
and multiplying by the ZZ area in km2.
No known wastewater treatment plants impacted Suttle Lake during
the sampling year.
See Working Paper No. 175.
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A. Waste Sources:
1. Known municipal - None
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
kg P/ % of
Source ^r total
a. Tributaries (non-point load) -
Blue Lake outlet 1,520 81.9
b. Minor tributaries & immediate
drainage (non-point load) - 305 16.5
c. Known municipal STP's - None
d. Septic tanks* - 10 0.5
e. Known industrial - None
f. Direct precipitation** - 20 1.1
Total 1,855 100.0
2. Outputs -
Lake outlet - Lake Creek 1,355
3. Net annual P accumulation - 500 kg.
* Estimate based on six lakeshore dwellings and four campgrounds; see
Working Paper No. 175.
** See Working Paper No. 175.
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10
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source yr total
a. Tributaries (non-point load) -
Blue Lake outlet 14,670 76.6
b. Minor tributaries & immediate
drainage (non-point load) - 2,975 15.5
c. Known municipal STP's - None
d. Septic tanks* - 345 1.8
e. Known industrial - None
f. Direct precipitation** - 1,175 6.1
Total 19,165 100.0
2. Outputs -
Lake outlet - Lake Creek 29,445
3. Net annual N loss - 10,280 kg.
D. Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr kg N/km2/yr
Blue Lake outlet 32 313
* Estimate based on six lakeshore dwellings and four campgrounds; see
Working Paper No. 175.
** See Working Paper No. 175.
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11
E. Yearly Loads:
In the following table, the existing phosphorus loadings
are compared to those proposed by Vollenweider (Vollenweider
and Dillon, 1974). Essentially, his "dangerous" loading is
one at which the receiving water would become eutrophic or
remain eutrophic; his "permissible" loading is that which
would result in the receiving water remaining oligotrophic
or becoming oligotrophic if morphometry permitted. A meso-
trophic loading would be considered one between "dangerous"
and "permissible".
Note that Vollenweider's model may not be applicable to
water bodies with short hydraulic retention times.
Total Phosphorus Total Nitrogen
Total Accumulated Total Accumulated
grams/m2/yr 1.70 0.46 17.6 loss*
Vollenweider phosphorus loadings
(g/m2/yr) based on mean depth and mean
hydraulic retention time of Suttle Lake:
"Dangerous" (eutrophic loading) 1.24
"Permissible" (oligotrophic loading) 0.62
* There was an apparent loss of nitrogen during the sampling year. This
may have been due to nitrogen fixation in the lake, solubilization of
previously sedimented nitrogen, recharge with nitrogen-rich ground water,
unsampled point sources discharging directly to the lake, or (probably)
insufficient outlet sampling in relation to the relatively short hydraulic
retention time of the lake. Whatever the cause, a similar nitrogen loss
has occurred at Shagawa Lake, Minnesota, which has been intensively studied
by EPA's former National Eutrophication and Lake Restoration Branch (Malueg
et al., 1975).
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12
V. LITERATURE REVIEWED
Malueg, Kenneth W., D. Phillips Larsen, Donald W. Schults, and
Howard T. Mercier; 1975. A six-year water, phosphorus, and
nitrogen budget for Shagawa Lake, Minnesota. Jour. Environ.
Qual., vol. 4, no. 2, pp. 236-242.
Newcombe, Hugh R., 1941. A biological investigation of forty
lakes of the upper Deschutes River watershed in Oregon.
Lake Survey Rept. No. 1. OR Game Comm., Portland.
Vollenweider, R. A., and P. J. Dillon, 1974. The application of
the phosphorus loading concept to eutrophication research.
Natl. Res. Council of Canada Publ. No. 13690, Canada Centre
for Inland Waters, Burlington, Ontario.
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Y:L APPENDICES
13
APPENDIX A
LAKE RANKINGS
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
4101 BROWNLEE RESERVOIR
4102 DIAMOND LAKE
4103 HELLS CANYON RESERVOIR
4104 HILLS CREEK RESERVOIR
4105 OWYHEE
4106 OXBOW RESERVOIR
4107 SUTTLE LAKE
4108 WALDO LAKE
MEDIAN
TOTAL P
0.079
0.028
0.068
0.038
0.095
0.071
0.031
0.005
MEDIAN
INORG N
0.560
0.040
0.640
0.060
0.425
0.690
0.040
0.040
500-
MEAN SEC
428.133
294.500
429.111
435.200
480.417
425.555
95.000
-100.000
MEAN
CHLOHA
16.207
7.300
18.722
2.333
3.350
10.311
9.167
0.350
15-
MIN DO
14.500
6.800
12.400
7.400
13.200
12.200
6.800
6.600
MEDI,
DISS ORTI
0.043
0.011
0.045
0.027
0.064
0.040
0.020
0.006
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PERCENT OF LAKES WITH HIGHER vALuts (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
4101 BROWNLEE RESERVOIR
4102 DIAMOND LAKE
4103 HELLS CANYON RESERVOIR
4104 HILLS CREEK RESERVOIR
4105 OWYHEE
4106 OXflOW RESERVOIR
4107 SUTTLE LAKE
4108 WALDO LAKE
MEDIAN
TOTAL
14 (
86 <
43 (
57 (
0 <
29 (
71 (
100 <
P
1)
6)
3)
4)
0)
2>
5)
7)
MEDIAN
INORG
29 (
93 (
14 (
57 (
43 (
0 (
71 (
93 (
N
2)
6)
1)
4)
3)
0)
5)
6)
500-
MEAN
MEAN SEC
43 (
71 (
29 (
14 (
0 (
57 (
86 (
100 (
3)
5)
2)
1)
0)
4)
6)
7)
CHLORA
14 (
57 (
0 (
86 (
71 (
29 (
43 (
100 (
1)
4)
0)
6)
5).
2)
3)
7)
15-
MEDIAN
MIN DO
0 (
86 (
29 (
57 (
14 (
43 (
86 <
86 (
0)
5)
2)
4)
1)
3)
5)
5)
DISS ORTHO P
29 (
86 (
14 {
57 (
0 (
43 (
71 (
100 (
2)
6)
1)
4)
0)
3)
5)
7)
INDE
NO
129
479
129
328
128
201
426
579
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LAKES RANKED BY INDEX NOS.
RANK' LAKE CODE LAKE NAME INDEX NO
1 4108 WALDO LAKE 579
2 4102 DIAMOND LAKE 479
3 4107 SUTTLE LAKE 428
4 4104 HILLS CREEK RESERVOIR 328
5 4106 OXtiOW RESERVOIR 201
6 4101 BROWNLEE RESERVOIR 129
7 4103 HELLS CANYON RESERVOIR 129
8 4105 OWYHEE 123
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APPENDIX B
CONVERSION FACTORS
-------
CONVERSION FACTORS
hectares x 2.471 * acres
Kilometers x 0.6214 = miles
Steters x 3.281 * feet
_g
-------
APPENDIX C
TRIBUTARY FLOW DATA
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FLO* JNF'JNMATION FOR OREGON
08/11/76
LA«E COOE.
SUTTLE LAKE
4107A1
4107B1
4107ZZ
TOTAL UPAIMAGE AREA OF LAKE(SO KM)
1.70
1.59
0.097
57.5
NORMALIZED FLOWS(CMS)
TRIBUTARY AOfA(S!J KM)
57.5
46.9
10.6
1.6e
1.56
0.09?
1.50
1.39
0.097
1. 7«
1 .t>4
O.OV7
2.27
2.10
0.097
JUN
1.90
1.76
0.097
JUL
1.10
1.05
0.097
AUG
0.90
0.85
0.097
SEP
0.87
0.82
0.097
OCT
0.93
0.83
0.097
NOV
1.16
1.10
0.097
DEC
1.58
1.47
0.097
MEAN
1.44
1.35
0.097
TOTAL DRAINAGE A*LA OF LAKE =
SUM OF SUB-DRAINAGE AREAS =
57.5
57.5
MEAN MONTHLY FLOWS AND UAILY FLOWS2
2.1*0
1.388
2.832
2.095
1.189
1.104
0.991
17
21
10
17
21
SUMMARY
TOTAL FLOW IN =
TOTAL FLO* OUT =
17.36
17.36
FLOW DAY
a.010
2.350
1.161
1.841
2.152
FLOW
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APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORET (RETRIEVAL OATf 7*>/08/12
DATE
FROM
TO
75/03/28
75/07/16
75/10/31
DATE
FROM
TO
75/03/28
75/07/16
75/10/31
TIME DEPTH
OF
DAY FEET
11 ?0 0000
11 20 0005
11 20 0015
11 20 0030
11 20 0045
11 ?0 0061
15 30 0000
15 30 0005
15 30 0015
15 30 0035
15 30 0062
10 15 0000
10 15 0005
10 15 0030
10 15 0061
TIME DEPTH
OF
DAY FEET
11 20 0000
11 ?0 0005
11 20 0015
11 20 0030
11 20 0045
11 20 0061
15 30 0000
15 30 0005
15 30 0015
15 30 0035
15 30 0062
10 15 0000
10 15 0005
10 15 0030
10 1^ 0061
0001C
WATER
TF.MP
CtMT
2.7
3.5
3.5
3.5
3.5
3.5
Ib.a
16.8
16.6
12.2
11.1
10. .030
0.020K
0.020K
0.020K
0.020K
0.020K
00671
PHOS-DIS
ORTriO
MG/L P
0.024
0.020
0.021
0.022
0.014
0.028
0.013
0.014
0.007
0.020
0.041
0.013
0.014
0.025
0.014
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APPENDIX E
TRIBUTARY DATA
-------
STORE! RETRIEVAL DATE 76/08/12
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
10 30
09 45
10 ?5
14 00
14 20
14 45
14 45
14 25
14 15
13 00
13 45
14 10
19 00
12 55
13 30
74/11/22
74/12/14
75/01/04
75/01/17
75/02/0-*
75/02/21
75/03/0^
75/04/14
75/05/18
75/06/18
75/07/20
75/08/09
75/08/10
75/09/13
4107A1
44 25 35.0 121 43 30.0 4
LAKE CREEK
41 15 SISTERS
0/S'JTTLE LAKE 131091
SANTIAM Hs»Y B*DG 13.5 Ml NE OF SISTERS
11EPALES 2111204
0000 FEET DEPTH CLASS 00
10630
I&N03
OTAL
IG/L
0.016
0.008
0.008
0.008
0.008
0.003
0.006
0.005
0.005
0.025
0.020
O.OOb
0.145
0.020
0.020
00625
TOT KJEL
N
MG/L
0.200
0.600
0.200
0.900
0.200
0.600
1.600
0.800
0.350
0.350
0.300
0.600
0.850
0.450
1.600
00610
NH3-N
TOTAL
MG/L
0.025
0.030
0.007
0.010
0.016
0.024
0.056
0.016
0.005*
0.020
0.010
0.015
0.015
0.045
0.015
00671
PHOS-OIS
ORTHO
MG/L P
0.015
0.01S
0.010
0.017
C.008K
0.008
O.OOS
0.008
0.015
0.010
0.015
0.010
0.005K
00665
PHOS-TOT
MG/L P
0.040
0.020
0.040
0.030
0.010
0.020
0.010
0.020
0.010
0.030
0.030
0.040
0.090
0.020
0.040
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORET RETRIEVAL DATE 7b/0d/l<>
410761
44 25 05.0 121 45 20.0 4
BLUE LAKE OUTLET
41 15 THR FNGKD JAC
T/SUTTLE LAKE 130*92
SEC «0 BROG 15.5 MI NE OF SISTERS
11EPALES 2111204
0000 FEET DEPTH CLASS 00
DATE
FROM
TO
74/10/19
7^/11/22
74/12/14
75/01/04
75/01/17
75/02/09
75/02/21
75/03/09
75/04/14
75/05/18
75/06/18
75/07/20
75/08/10
75/09/13
TIME DEPTH
OF
DAY FEET
09 50
10 00
13 40
14 00
14 30
It 00
14 10
14 30
13 40
13 00
14 30
12 40
13 20
00630
N02&N03
N-TOTAL
MG/L
0.02*
0.016
0.016
0.003
0.008
o.ooa
0.006
0.012
0.005
0.020
0.010
0.005
0.020
0.015
00625
TOT KJEL
N
MG/L
0.175
0.100K
0.100K
0.500
0.300
0.700
0.100
1.000
O.B75
0.050K
0.400
0.075
0.050K
0.500
00610
NH3-N
TOTAL
MG/L
0.175
0.015
0.005
0.020
0.008
0.016
0.012
0.012
0.005K
0.010
0.005
0.020
0.015
0.005K
00671
PHOS-DIS
ORTHO
MG/L P
0.035
0.040
0.040
0.035
0.032
0.016
0.016
0.016
0.020
0.015
0.025
0.030
0.035
00665
PMOS-TOT
MG/L P
0.040
0.040
0.040
0.050
0.032
0.030
0.016
0.020
0.020
0.030
0.022
0.030
0.050
0.050
K VALUE KNOWN TO BE
LESS THAN INDICATED
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