U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
TROUT LAKE
ITASCA COUNTY
MINNESOTA
EPA REGION V
WORKING PAPER No, 131
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
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REPORT
ON
TROUT LAKE
ITASCA COUNTY
MINNESOTA
EPA REGION V
WORKING PAPER No, 131
WITH THE COOPERATION OF THE
MINNESOTA POLLUTION CONTROL AGENCY
AND THE
MINNESOTA NATIONAL GUARD
NOVEMBER, 1974
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1
CONTENTS
Page
Foreword
List of Minnesota Study Lakes iv, v
Lake and Drainage Area Map vi
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Summary 4
IV. Nutrient Loadings 9
V. Literature Reviewed 14
VI. Appendices 15
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11
FOR EWORD
The National Eutrophication Survey was initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to fresh water lakes and
reservoi rs.
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 0
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 [ g303(e)], water
quality criteria/standards review [ g303(c)], clean lakes [ g314(a,b)],
and water quality monitoring [ lO6 and 3O5(b)] activities riandated
by the Federal Water Pollution Control Act Amendments of 1972.
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111
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.
ACKNOWLEDGMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Minnesota Pollution Control
Agency for professional involvement and to the Minnesota National
Guard for conducting the tributary sampling phase of the Survey.
Grant J. Merritt, Director of the Minnesota Pollution Control
Agency, John F. McGuire, Chief, and Joel G. Schilling, Biologist,
of the Section of Surface and Groundwater, Division of Water Quality,
provided invaluable lake documentation and counsel during the course
of the Survey; and the staff of the Section of Municipal Works, Divi-
sion of Water Quality, were most helpful in identifying point sources
and soliciting municipal participation in the Survey.
Major General Chester J. Moeglein, the Adjutant General of
Minnesota, and Project Officer Major Adrian Beltrand, who directed
the volunteer efforts of the Minnesota National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.
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iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF MINNESOTA
LAKE NAME COUNTY
Albert Lea Freeborn
Andrusia Beltrami
Badger Polk
Bartlett Koochiching
Bear Freeborn
Bemidji Beltrami
Big Stearns
Big Stone Big Stone, MN; Roberts,
Grant, SD
Birch Cass
Blackduck Beltrami
Blackhoof Crow Wing
Budd Martin
Buffalo Wright
Calhoun Hennepin
Carlos Douglas
Carrigan Wright
Cass Beltrami, Cass
Clearwater Wright, Stearns
Cokato Wright
Cranberry Crow Wing
Darling Douglas
Elbow St. Louis
Embarass St. Louis
Fall Lake
Forest Washington
Green Kandlyohi
Gull Cass
Heron Jackson
Leech Cass
Le Homme Dieu Douglas
Lily Blue Earth
Little Grant
Lost St. Louis
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V
LAKE NAME COUNTY
Madison Blue Earth
Malmedal Pope
Mashkenode St. Louis
McQuade St. Louis
Minnetonka Hennepin
Minnewaska Pope
Mud Itasca
Nest Kandiyohi
Pelican St. Louis
Pepin Goodhue, Wabasha, MN;
Pierce, Pepin, WI
Rabbit Crow Wing
Sakatah Le Sueur
Shagawa St. Louis
Silver McLeod
Six Mile St. Louis
Spring Washington, Dakota
St. Croix Washington, MN; St. Croix,
Pierce, WI
St. Louis Bay St. Louis, MN; Douglas, WI
Superior Bay St. Louis, MN; Douglas, WI
Swan Itasca
Trace Todd
Trout Itasca
Wagonga Kandiyohi
Wailmark Chisago
White Bear Washington
Winona Douglas
Wolf Beltrami , Hubbard
Woodcock Kandiyohi
Zumbro Olmstead, Wabasha
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d
TROUT LAKE
Sewage Treatment Facility
® Tributary Sampling Site
X Lake Sampling Site
Direct Drainage Area Limits
Indirect Drainage Area
\
Nap Location
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TROUT LAKE
STORET NO. 2793
I. CONCLUSIONS
A. Trophic Condition:
Survey data show that Trout Lake is eutrophic. Of the 60
Minnesota lakes sampled in October, when all essentially were
well—mixed, 28 had less mean total phosphorus, 36 had less mean
dissolved phosphorus, but only seven had less mean inorganic
nitrogen. For all data, only six lakes had greater Secchi disc
transparency, and 13 had less chlorophyll a.
Hypolimnetic depression of dissolved oxygen occurred at all
stations in July, and near-depletion occurred at all stations in
September, 1972.
B. B. Rate-Limiting Nutrient:
Algal assay results show that Trout Lake was nitrogen
limited at the time the assay sample was collected. Lake data
show nitrogen limitation at the other sampling times as well
(N/P ratios were less than 6/1).
C. Nutrient Controllability:
1. Point sources--During the sampling year, Trout Lake
received a total phosphorus load at a rate in excess of that
proposed by Vollenweider (in press) as “dangerous”; i.e., a
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2
eutrophic rate (see page 13). Of this load, it is estimated
that about 88% originated from the Coleraine-Bovey sewage
treatment plant.
It is estimated that 80% phosphorus removal at the Coleraine-
Bovey sewage treatment plant would reduce the loading rate to
0.8 lbs/acre/yr or 0.10 g/ni 2 /yr--the “permissible’ (oligotrophic)
rate.
It is concluded that phosphorus control at the Coleraine-
Bovey sewage treatment plant would result in improvement of
the trophic condition of Trout Lake.
2. Non-point sources--The phosphorus export of the unnamed
stream (A-l) was a very low 13 lbs/mi 2 /yr (see page 13).
In all, it is estimated that non-point sources contributed
less than 12% of the total phosphorus load reaching Trout Lake
during the sampling year.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometry :
1. Surface area: 1,890 acres.
2. Mean depth: 50 feet.
3. Maximum depth: 135 feet.
4. Volume: 94,500 acre/feet.
5. Mean hydraulic retention time: 17.4 years.
B. Tributary and Outlet:
(See Appendix A for flow data)
1. Tributaries -
Name Drainage area* Mean flow*
2
Unnamed stream 1.5 mi 0.6 cfs
Minor tributaries & 2
immediate drainage - 11.8 mi 6.9 cfs
Totals 13.3 mi2 7.5 cfs
2. Outlet -
Trout Creek 16.2 mi2** 7.5 cfs
C. Precipitation***:
1. Year of sampling: 22.6 inches-.
2. Mean annual: 25.7 inches.
t DNR lake survey map (1966); mean depth by random dot method.
* Drainage areas are accurate within ±5%; mean daily flows are accurate
within ±10%; and ungaged flows are accurate within ±10 to 25% for
drainage areas greater than 10 mi2.
** Includes area of lake.
*** See Working Paper No. 1, "Survey Methods".
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4
III. LAKE WATER QUALITY SUMMARY
Trout Lake was sampled three times during the open-water season of
1972 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 vi).
During each visit, a single depth-integrated (15 feet to surface) sample
was compos -ited from the stations for phytoplankton identification and
enumeration; and during the last visit, a single five-gallon depth—
integrated sample was composited for algal assays. Also each time, a
depth-integrated sample was collected from each of the stations for
chlorophyll a analysis. The maximum depths sampled were 48 feet at sta-
tion 1, 118 feet at station 2, and 40 feet at station 3.
The results obtained are presented in full in Appendix B, and the
data for the fall sampling period, when the lake was essentially well-
mixed, are summarized below. Note, however, the Secchi disc summary
is based on all values.
For differences in the various parameters at the other sampling
times, refer to Appendix B.
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5
A. Physical and chemical characteristics:
FALL VALUES
(10/22/72)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 7.2 7.4 7.4 7.6
Dissolved oxygen (mg/i) 7.4 9.0 9.2 9.6
Conductivity (pmhos) 300 316 320 320
pH (units) 8.1 8.1 8.1 8.2
Alkalinity (mg/i) 48 110 119 123
Total P (mg/i) 0.043 0.052 0.050 0.092
Dissolved P (mg/i) 0.036 0.040 0.040 0.049
NO + NO (mg/i) 0.020 0.049 0.050 0.070
Am onia mg/1) 0.020 0.037 0.030 0.080
ALL VALUES
Secchi disc (inches)
72 110
102 152
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6
B. Biological characteristics:
1. Phytoplankton —
Sampling Dominant Number
Date Genera per ml
07/11/72 1. Dinobryon 2,333
2. Flagellates 850
3. tiicrocystis 669
4. Anabaena 307
5. Chroococcus 199
Other genera 380
Total 4,738
09/08/72 1. Microcystis 2,542
2. Dinobryon 325
3. Anabaena 132
4. Chroococcus 96
5. Melosira 48
Other genera 170
Total 3,313
10/22/72 1. Dinobryon 2,151
2. Flagellates 1,283
3. Asterionella 1,170
4. Melosira 906
5. Anabaena 792
Other genera 3,245
Total 9,547
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01
02
03
01
02
03
Maximum yield
( mg/i-dry wt. )
1 .6
1 .8
1 .9
1 .6
1 .8
43.8
13.2
09/08/72
10/22/72
2.6
4.3
5.1
12.8
12.7
14.1
2. Chlorophyll a -
(Because of instrumentation problems during the 1972 sampling,
the following values may be in error by plus or minus 20 percent.)
Sampling Station Chlorophyll a
Date Number ( pg/i )
07/11/72 01 2.9
02 4.8
03 3.8
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P Inorganic N
Spike (mg/i) Conc. (mci/i) Conc. (mdl ) _____________
Control 0.020 0.051
0.006 P 0.026 0.051
0.012 P 0.032 0.051
0.024 P 0.044 0.051
0.060 P 0.080 0.051
0.060 P + 10.0 N 0.080 10.051
10.0 N 0.020 10.051
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum , indicates that the potential primary productivity
of Trout Lake was moderate at the time the assay sample was
collected. Also, the lack of significant change in yields
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8
with increased levels of orthophosphate until nitrogen also
was added shows that the lake was nitrogen limited at the
time the sample was collected. Note that the addition of
only nitrogen resulted in a yield greater than the control
yield.
Nitrogen limitation is also indicated by the field data
for each of the sampling times (i.e., N/P ratios were less
than 6/1 on all occasions).
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9
IV. NUTRIENT LOADINGS
(See Appendix C for data)
For the determination of nutrient loadings, the Minnesota National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page vi), except for the high
runoff months of April and May when two samples were collected. Samp-
ling was begun in October, 1972, and was completed in October, 1973.
Through an interagency agreement, stream flow estimates for the year
of sampling and a “normalized” or average year were provided by the
Minnesota District Office of the U.S. Geological Survey for the tribu-
tary sites nearest the lake.
In this report, nutrient loads for sampled tributaries were deter-
mined by using a modification of a U.S. Geological Survey computer
program for calculating stream loadings*. Nutrient loadings for unsampled
“minor tributaries and immediate drainage” (“ZZ” of U.S.G.S.) were esti-
mated by using the means of the nutrient loads, in lbs/mi 2 /year, at sta-
tions B-i, C-i, G-1, H-i, and J-i of nearby Swan Lake and multiplying
the means by the U area in mi 2 .
Nutrient loads from the sewage treatment plant serving Coleraine and
Bovey were estimated at 2.5 lbs P and 7.5 lbs N/capita/year.
* See Working Paper No. 1.
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A. Waste Sources:
1. Known municipal -
Pop. Mean Receiving
Name Served* Treatment Flow (mgd) Water
Coleraine- 1,086 trickling 0 194** Trout Lake
Bovey 858 filter
2. Known industrial - None
* 1970 Census.
** Estimated at 100 gal/capita/day for combined population.
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B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
lbs P/ % of
Source yr total
a. Tributaries (non-point load) —
Unnamed stream (A-i) 20 0.4
b. Minor tributaries & immediate
drainage (non-point load) - 330 5.9
c. Known municipal —
Coleraine-Bovey 4,860 88.0
d. Septic tanks* - 20 0.4
e. Known industrial — None
f. Direct precipitation** - 290 5.3
Total 5,520 100.0
2. Outputs -
Lake outlet - Trout Creek 440
3. Net annual P accumulation - 5,080 pounds
* Estimate based on 31 shoreline dwellings (1969 U.S.G.S. map); see
Working Paper No. 1.
** See Working Paper No. I.
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12
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
lbs N I % of
Source yr total
a. Tributaries (non-point load) -
Unnamed stream (A-i) 530 1.1
b. Minor tributaries & immediate
drainage (non-point load) - 13,860 29.2
c. Known municipal -
Coleraine-Bovey 14,580 30.7
d. Septic tanks* - 730 1.5
e. Known industrial - None -
f. Direct precipitation** - 17,820 37.5
Total 47,520 100.0
2. Outputs -
Lake outlet - Trout Creek 13,600
3. Net annual N accumulation - 33,920 pounds
* Estimate based on 31 shoreline dwellings (1969 U.S.G.S. map); see
Working Paper No. 1.
** See Working Paper No. 1.
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13
D. Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tributary lbs P/mi 2 /yr lbs N/mi 2 /yr
Unnamed stream 13 353
E. Yearly Loading Rates:
In the following table, the existing phosphorus loading
rates are compared to those proposed by Vollenweider (in press).
Essentially, his “dangerous” rate is the rate at which the
receiving water would become eutrophic or remain eutrophic;
his “permissible” rate is that which would result in the
receiving water remaining oligotrophic or becoming oligo-
trophic if morphometry permitted. A mesotrophic rate would
be considered one between “dangerous” and “permissible”.
Total Phosphorus Total Nitrogen
Units Total Accumulated Total Accumulated
lbs/acre/yr 2.9 2.7 25.1 17.9
grams/mr/yr 0.33 0.30 2.8 2.0
Vollenweider loading rates for phosphorus
(gfm 2 /yr) based on mean depth and mean
hydraulic retention time of Trout Lake:
“Dangerous” (eutrophic rate) 0.20
“Permissible” (oligotrophic rate) 0.10
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V. LITERATURE REVIEWED
Anonymous, 1973. Wastewater disposal facilities inventory. MPCA,
Minneapolis.
Schilling, Joel, 1974. Personal communication (lake map). MPCA,
Minneapolis.
Vollenweider, Richard A., (in press). Input-output models. Schweiz.
A. Hydrol.
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15
VII. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
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rprFl,ITAPY FLOW INFOMMATION FOP MIP’INESOIA 10/30/74
LA F COOF ?703 r UiT LA’Q
TOTAL I)RATNAGF APEA OF LAPcE
SUr3—flPA1 GE NO MAL1ZFr) FLOWS
TPIRUTAPY ARFA JAN FF MA APP MAY JUN JUL AUG SEP OCT NOV DEC MEAN
?79 3A1 1.5” 0.11 Ø•fl7 0.26 7•3 1.61 1.35 0.55 0.23 0.41 0.46 0.27 0.24 0.66
279141 16.20 1.90 I.1 3.43 2H.10 17.20 33.90 5.72 2.65 3.78 5.09 3.24 3.11 7.47
?7917Z 14.70 2.47 1.64 4.27 25.20 15.20 12.90 5.10 2.27 3.38 4.40 2.75 3.32 6.89
SUMMARY
TOTAL OPAJNAG AREA OF LAPSE = 16.20 TOTAL FLOW IN 90.64
SUM OF SLJN—OPAINAI,E APEAS = 16.24 TOTAL FLOW OUT = 89.70
ME4N MONTHLY FLONS ANI) )AILY FLOWS
TPIAIJTARY MONTH Y AP MEAN FLOW flAY FLOw UAY FLOW DAY FLOW
?791A1 10 7? 0. I 14 0.20
I I 77 0. S 19 0.3C
1? 72 0.10
1 73 0.? 9 0.20
2 71 0.13 18 0.10
3 73 0. 55
4 73 0.71 6 0.70 19 0.60
5 71 1.34 5 0.90 20 1.20
6 73 3• 1S 14 0.90
7 73 O.’.8 26 0.55
9 73 0.50 ‘0 0.53
9 73 0.51
279141 10 7 3’. 14 1.90
I I 72 3.4? 14 1.20
32 7? 3 4P
73 3.74
7 73 7•74 2.30
1 73 .09
4 73 Q•’.) 5 8.6’) 19 7.30
5 71 l4. 0 S 9.?0 20 34.00
6 7 3 11.10 I’. 9.70
7 71 5.01 26 4 M(,
4 73 5. 0 ?u 6.10
9 73 4.73
?791.’7 10 72 ?. i ’ 14 1.50
I I 7? ‘.‘ 0 14 2.70
I? 7 4.11
I 71 4.47 4.83
73 ?.76 IH 7.90
3 73 9.01 17 11.00
6 73 7.56 5 7.70 IQ 6.60
5 73 37.60 5 7.60 20 11.00
10.10 1’.
7 73 4•6 26 5.20
P 71 70 5.20
4 73 4.’ I
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APPENDIX B
PHYSICAL and CHEMICAL DATA
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STORET RETRIEVAL DATE 74/10/30
279301
47 16 48.0 093 24 57.0
TROUT LAXE
27 MINNESOTA
1IEPALES 211)202
3 0042 FEET DEPTH
00010 00300 00077 00094 00400 00410 00630 00610 00665 00666
DATE TIME ITWPTlI WATER DO TRANSP CNDUCTVY PH 1 ALK N02&N03 NH3—N PHOS—TOT P1405—015
FROM OF TEMP SECCHI FIELD CACO3 N—TOTAL TOTAL
TO DAY FEET CENT MG/L INCI- ES MICROMHO SU MG/L HG/L MG L MG/L P MG/L P
72/07/11 06 25 0000 102 370 8.60 111 0.040 0.050 0.014 0.008
06 25 0004 20.R 9.8 360 8.50 110 0.040 0.050 0.015 0.008
06 25 0015 20.8 8.8 360 8.50 111 0.040 0.050 0.018 0.011
06 25 0024 12.5 5.4 370 8.00 125 0.080 0.050 0.040 0.033
06 25 0040 6.4 5.6 400 7.50 129 0.120 0.050 0.071 0.050
72/09/OR 18 18 0000 144 298 8.70 116 0.030 0.050 0.015 0.009
18 18 000’ 17.5 9.3 281 8.78 1)6 0.030 0.050 0.015 0.010
18 18 0015 17.2 Q•4 280 8.75 119 0.030 0.050 0.017 0.009
18 18 0025 16.1 6.5 290 8.35 122 0.030 0.050 0.020 0.012
18 18 0035 9.1 2.0 328 7.35 133 0.130 0.060 0.190 0.184
18 18 0048 6.8 2.0 320 7.30 134 0.190 0.060 0.107 0.10L
72/10/22 14 30 0000 72 320 8.15 121 0.060 0.030 0.046 0.038
14 30 0004 7.5 9.6 310 8.15 90 0.060 0.040 0.050 0.841
14 30 0015 7.5 9.5 320 8.20 48 0.020 0.040 0.050 0.138
14 30 0025 7.5 9.4 320 8.20 48 0.020 0.050 0.046 0.039
14 30 0035 7.’ 9.2 320 8.20 119 0.050 0.020 0.052 0. 841
14 30 0040 7.2 9.2 320 8.15 120 0.060 0.030 0.055 0.044
1”17
DAly TIME flE T 4 CI-IL PHYL
FROM OF A
TO DAY FEET UG/L
7 ?/O7/11 06 25 0000 2.’J
72/09/OR IA 19 0000
72/10/22 14 30 0000 12.AJ
J VALUE KNOWN TO BE IN ERROR
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sr ’ r F 1P1 VAL ‘‘.‘i”i u
?793U2
47 15 38.0 093 24 20.0
T ’ )’J1 LArcE
27 ‘I INNFSOTA
IIFPALES 2111202
3 0090 FEET DEPTH
C)077 0 ’)094 0O’.Ofl 00410 00630 00610 00665 00666
r)ATE ‘ F ’r-i , ATr ,, 0 1 S C jr)tJCTVY i’H I AL) O2 .NO3 Nr13—P1 PHOS—TOT PHOS—DIS
F49M ‘1V 5 CCr- ’1 FIELI) CACO3 HTOTAL TOTAL
ro )AY cF2T C ’ -’.T l’/t 1 ’a - ’FS “IIC ”UH.-IO SU HG/L MG/L MG/L MG/L P HG/L
72/07/11 (17 10 , ‘ ,OO) 10’ 351 ’ R.5O 111 0.040 0.060 0.021 0.012
(7 0 7 (i. , . ‘ 345 8.50 112 0.030 0.050 0.018 0.010
07 tO 1 )t P j. -’ 150 8.50 I I I 0.040 0.060 0.018 0.011
10 (m I. ) 40C 7. ”) 128 0.080 0.050 0.046 0.034
0’ 10 007’. “. 400 7.50 I ? ’ 0.110 0.050 0.051 0.043
7?f0 /0 Ii S 0A ’2 131’ 283 ‘ .70 116 0.030 0.050 0.017 0.009
IT ‘0 COf’. 7.’ •-. .. 2R0 8.75 1l 0.030 0.050 0.021 0.010
I7 ‘5 Oil’, 1 . .l 8 .70 120 0.030 0.050 0.019 0.011
J7 P S I ’ - .— .? 280 8.73 108 0.030 0.040 0.016 0.010
17 25 o ’Y3’- 9. .’ 2 .’. 320 7.40 128 0.060 0.030 0.04S 0.039
17 ‘5 ‘ 0 h .’- . - 122 7.35 130 0.150 0.040 0.078 0.071
17 7 ’ - 0fiO .. - ‘.4 1’? 7.30 130 0.210 0.050 0.096 0.091
17 ‘1 ” ) ‘ ,.- -‘.2 7.30 179 0.250 0.040 0.110 0.103
I ? ‘I’ 1.- 315 7.30 1?’ 0.270 0.090 0.141 0.136
7?/l.j/2 .’ 13 ‘-6 Jo’ ‘ir, 310 8.10 119 0.050 0.030 0.043 0.037
I SC fl ’ ’ . ‘..- “. 115 8.10 119 0.050 0.020 0.050 0.049
C ‘“15 7.- . 315 .l0 119 0.050 0.030 0.047 0.040
Ii 58 fJ ’ .’) 7.S ‘•F, 120 P.15 122 0.060 0.040 0.049 0.040
I ) ‘-‘0 G’) ’ -,S 7. ’ -..u 120 ‘4.10 123 0.050 0.050 0.048 0.047
I I t3 0I ”S 7. ’ ‘- ‘.‘ 115 ‘3.11 1’2 0.060 0.060 0.057 0.042
I I ‘0 Il- 7.2 —.‘ 1?0 8.1’ , 122 0.01t3 0.080 0.055 0.041
4’- ’ 1
0 T I I ir ‘r. . ‘I ‘ “
34 ‘ I
t , V Fr:r P’,/(
7?.’)l’lI ‘7 t O ““‘“
7?/0’ /C2 17 ‘ 0
72/10/22 I I fl ‘6,)”
J VALUE KNOWN TO BE IN ERROR
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STORET RETRIEVAL DATE 74/10/30
279303
‘ .7 14 52.0 093 23 50.0
TROuT LAIft
27 HINNEcOTA
IIFPALES 2111202
3 0034 FEET DEPTH
00010 00300 00077 ‘10094 00400 00 ’.10 00630 00610 00665 00666
DATE TTMF DEPTH WATER 00 WANSP CNr)UCTVY PH T ALK N026N03 NH3—N P805—TOT P805—015
FROM OF TE’4° SECCIiI FIEL) CACO3 N—TOTAL TOTAL
TO DAY FEET CENT MF,/L INCHES M1C OMHO SO HG/L MC,/L MG/L MG/L P MG/L P
72/07/11 08 00 0000 102 150 8.50 I II 0.040 0.050 0.023 0.010
08 00 0004 19.9 8.8 112 0.040 0.060 0.019 0.009
OR 00 0015 19.7 9.4 360 8.80 113 0.040 0.060 0.017 0.010
08 00 0031 7.9 5.8 400 7.50 130 0.080 0.060 0.043 0.024
72/09/08 16 45 0000 17.7 152 282 8.7) 122 0.030 0.060 0.016 0.009
16 45 0004 17.7 .2 100 .7fl 121 0.040 0.070 0.016 0.011
16 45 0015 17.6 9.5 2 9 8.7) 120 0.030 0.050 0.020 0.012
16 45 0025 17.o 8.7 299 8.65 120 0.030 0.050 0.017 0.010
16 45 0010 15.0 7.0 299 8.70 13 0.020 0.040 0.020 0.013
16 45 0035 9.9 1.9 340 7.40 137 0.040 0.040 0.032 0.028
15 45 0040 8.’. 1.8 340 7.35 117 0.090 0.050 0.056 0.052
72/10/?? 11 IS 0000 96 120 8.10 123 0.050 0.040 0.054 0.036
13 iS 0004 7.4 8.9 120 .1fl 121 0.040 0.020 0.043 0.036
13 15 0015 7.’. 8.9 1?0 8.10 117 0.050 0.030 0.051 0.038
13 15 00?) 7.4 .2 300 8.1 ’) 114 0.040 0.020 0.054 0.036
I] IS 0031) 7.4 7.4 I0 8.10 114 0.050 0.030 0.092 0.040
17?I 7
DATE TIMF DFPT-l CHL9PH L
FROM OF
TO DAY FfFT U(,/L
72/07/Il 08 00 0000 3.8J
7?/OQLO8 16 65 0000 5.1J
72/10/?? 13 15 0000 14.IJ
J VALUE KNOWN TO BE IN ERROR
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APPENDIX C
TRIBUTARY DATA
-------
ST1PET ?ET’fl V’ft ‘:‘t- / ‘
?1 3A1 LS27Y3AI
47 1 00.0 i 93 23 00.0
U’INAMEI) STREAM 1’ TO TkOUT LAP(E
7.5 ROVEY
t/T’OuT LAKE
CO ‘-h’iY 1( fiiN 2.L MJ SE OFr3OVEY
11F t LfS ?111204
0000 FEET DEPTH
O) 71
)AT 1 [ tic -1 T’I t jL L N- —NJ - -,Oc—)1S HQ —f )T
rQflM J—T)t L T )TA( U Tr1O
TO flAY t ’/L P G/L P
7?/H/j’ u. ’ l Q .31 5 (j.U’O
J.O1 .
73/fl4/I’- ‘) ) .)?“ (.O1( (‘.03 J
71/)/0 I O “1 ‘.r .. ‘l1 J. 004K u.U15
71/’iS/ 2 t’ G —.1 .c .).0()’
1 O.Clu
7 /f 7/ - 1. .“I(’” . 11 ‘ 1 .C0 K
7 /,)-t/?L I ‘- .11 . ‘.‘ •1.r o K 0.010
7’/ / lr .‘17
K V LtJ KNOWN TO F LESS
TH N IfJOICATFI)
-------
ST1P T •- - 1 ‘t• v’ i- /
LS 7’ 3 1
), : O.c G’ 3 i Ou.O
1s? Jf C tt
,. .-WV
o/r d.)ur LAKE
i T C ) wY I C MJ SE OF OVE(
II AL S 21I1 O4
.4 u000 FEET DEPTrI
- • -‘— — I i ‘ . 7I
r . ..) • r L r - ‘- ‘— I I ’S— ‘ I ‘Z, I-. ’ ’ )‘ T T
T T’)F I
I ,‘.. ,‘ r - • .‘ ‘‘ /1 ‘ /L ‘‘ - .“L
72/ 1 ) / Ic, — , — c-_r .‘) ‘ - , O.UI
7?/)l/1L , .17I
7 /’ / )L ,- 4 ’ .r,I -. . .-
74/)./1 ’-’ r. . . • “ - •r7- ‘ . I1 r,.0 8 c
7 / L /,). ((‘ I ” ‘.rI
7 / ‘ - / 7 1 I .‘) I • ‘ • ‘) ‘ • 1 1 • 04’)
7 ’ ’- /l . -L •c. ,i • .03fl
71/f f/? c ._,1 ( •-,--. .‘il I ,.U1 , i s O )
7’)f ./ ’) . i -• -. ,.• ‘ - ,c- ‘.•)I •-’
n/v/o E’ ‘ •‘i • • ‘ ‘ .11
t VA jJ. r r’1r)wN TO Lr’;s
T ’-i N 1 ”DICATF 1 -)
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