U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKE ST, CROIX
WASHINGTON COUNTS MINNESOTA, AND
ST, CROIX AND PIERCE COUNTIES, WISCONSIN
EPA REGION V
WORKING PAPER No, 122
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVAILIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
ifrGPO 697.032
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REPORT
ON
LAKE ST, CROIX
WASHINGTON CQUOTY, MINNESOTA, AND
ST, CROIX AND PIERCE COUNTIES, WISCONSIN
EPA REGION V
WORKING PAPER No, 122
WITH THE COOPERATION OF THE
MINNESOTA POLLUTION CONTROL AGENCY
AND THE
MINNESOTA NATIONAL GUARD
JANUARY, 1975
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1
CONTENTS
P age
Foreword
List of Minnesota Study Lakes iv, v
Lake and Drainage Area Map vi
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 4
III. Lake Water Quality Summary 5
IV. Nutrient Loadings 9
V. Literature Reviewed 15
VI. Appendices 16
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1’1
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 fresh water 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 [ 3O3(e)], water
quality criteria/standards review [ 5303(c)], clean lakes [ 5314(a ,b)],
and water quality monitoring [ 5106 and §305(b)] activities mandated
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 Bel trami
Blackhoof Crow Wing
Budd Martin
Buffalo Wright
Calhoun Hennepin
Carlos Douglas
Carrigan Wright
Cass Beltrami, Cass
Cleat-water 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 Hornme 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
Walimark Chisago
White Bear Washington
Winoria Douglas
Wolf Beltrami, Hubbard
Woodcock Kandiyohi
Zunibro Olmstead, Wabasha
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vi
LAKE ST. CROIX
® Tributary Sampling Site
X Lake Sampling Site
Se,age Treatment Facility
Direct Drainage Area Limits
ioMi.
-J
Isc
Map Location
Co.
C
Still
ST. CROIX CO.
PIERCE CO.
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LAKE ST. CROIX*
STORET NO. 27A7
I. CONCLUSIONS
A. Trophic Condition:
Survey data show that Lake St. Croix is eutrophic. Of
the 60 Minnesota lakes sampled in the fall of 1972, when essen-
tially all were well-mixed, 14 had less mean total phosphorus,
13 had less mean dissolved phosphorus, and 35 had less mean
inorganic nitrogen. Of all 80 Minnesota lakes sampled, 45 had
greater mean chlorophyll a, and 36 had greater Secchi disc
transparency.
Reportedly, no particular aquatic nuisance problems are
indicated for Lake St. Croix, although an algae bloom occurred
in the summer of 1974 (Schilling, 1974).
B. Rate-Limiting Nutrient:
There was a loss of nitrogen in the assay sample and the
results of the algal assay are not indicative of conditions in
the lake at the time of sampling. However, the lake data indi-
cate nitrogen limitation in June and August and phosphorus
limitation in November.
C. Nutrient Controllability:
1. Point sources—-During the sampling year, Lake St. Croix
received a total phosphorus load at a rate of 79 lbs/acre/yr
* In this report, Lake St. Croix is considered to extend from the St.
Croix River bridge at Stiliwater, Minnesota, to the U.S. 10 highway
bridge just upstream from the confluence of the St. Croix River with
the Mississippi River.
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2
(8.9 g/m 2 /yr) or more than four times that proposed by Vollen-
weider (in press) as “dangerous”; i.e., a eutrophic rate (see
page 14). Now, Vollenweider’s model may not be applicable to
water bodies with very short hydraulic retention times, and
Lake St. Croix has a relatively short mean retention time of
23 days. However, the lake retained (accumulated) about 33%
of the applied phosphorus load during the sampling year, and
it is likely that the Vollenweider loading rates have some
significance in this case.
The Minnesota Pollution Control Agency regulations require
phosphorus control at point sources that directly or indirectly
contribute to lakes or reservoirs. It is calculated that even
complete removal of phosphorus at the point sources considered
in this study would still leave a loading rate of nearly 7.9
g/m 2 /yr (about 3½ times the eutrophic rate).
While a high level of point-source phosphorus control would
be expected to result in at least some improvement in the tro-
phic condition of Lake St. Croix, it appears that attention
will have to be given to non-point sources as well if an op-
timal level of phosphorus reduction is to be achieved (see
below).
2. Non—point sources--It is estimated that about 88% of the
total phosphorus load during the sampling year was contributed
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3
by non-point sources. The mean non-point phosphorus exports of
the various subdrainages do not appear to be excessive (see page
l4) but the rather high drainage area to lake area ratio of 600
to 1 ensures a significant loading rate from non-point sources
alone. Note that even the low phosphorus export of unimpacted
Trout Brook (22 lbs P/mi 2 /yr), if applied to the entire drainage,
would result in a lake loading rate of about 21 lbs/acre/yr or
2.3 g/m 2 /yr.
/
Go1
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4
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometryt:
1. Surface area: 8,209 acres.
2. Mean depth: 28.8 feet.
3. Maximum depth: 78 feet.
4. Volume: 236,419 acre/feet.
5. Mean hydraulic retention time: 23 days.
B. Tributary and Outlet:
(See Appendix A for flow data)
1. Tributaries -
Name
St. Croix River
Valley Branch Stream (B-l)
Trout Brook
Kinnickinnic River
Willow River
Minor tributaries &
immediate drainage -
Totals
Drainage area* Mean flow*
6,550.0 mi 4,472.7 cfs
13.0 mi 2 9.7 cfs
11.0 mi 2 2.6 cfs
167.0 mi 2 95.3 cfs
263.0 mi 41.0 cfs
683.2 mi 2 471.7 cfs
7,687.2 mi 2 5,093.0 cfs
2. Outlet -
St. Croix River 7,700.0 mi 2 ** 5,093.0 cfs
C. Precipitation***:
1. Year of sampling: 31.4 inches.
2. Mean annual: 30.9 inches.
t DNR lake survey map (1970); mean depth by random-dot method.
* Drainage areas are accurate within ±5%; mean daily flows are accurate
within ±10%; and ungaged flows ar accurate within ±10 to 25% for
drainage areas greater than 10 mit.
** Includes area of lake.
*** See Working Paper No. 1, “Survey Methods”.
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5
III. LAKE WATER QUALITY SUMMARY
Lake St. Croix 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 two or more depths at each station (see
map, page vi). During each visit, a single depth-integrated (15 feet or
near bottom to surface) sample was composited 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 15 feet at station 1, 71 feet at station 2, and 28 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 essentially was 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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6
A. Physical and chemical characteristics:
FALL VALUES
(11/04/72)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 5.0 6.2 6.4 7.0
Dissolved oxygen (mg/i) 10.0 10.5 10.5 10.8
Conductivity (jimhos) 203 209 210 215
pH (units) 7.5 7.5 7.5 7.6
Alkalinity (mg/i) 74 76 76 78
Total P (mg/i) 0.027 0.031 0.030 0.038
Dissolved P (mg/i) 0.014 0.017 0.017 0.022
NO + NO (mg/i) 0.190 0.212 0.200 0.250
Ani onia mg/i) 0.050 0.080 0.080 0.110
ALL VALUES
Secchi disc (inches) 36 44 36 60
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7
B. Biological characteristics:
1. Phytoplankton -
Sampling Dominant Number
Date Genera per ml
06/28/ 72 1 . Mel osira 1 ,039
2. Achnanthes 783
3. Dinobryon 693
4. Stephanodiscus 437
5. Flagellates 376
Other genera 1 ,582
Total 4,910
08/26/72 1. Dinobryon 2,532
2. Cyclotella 1,338
3. Chroococcus 524
4. Melosira 289
5. Pediastrum 271
Other genera 1 ,086
Total 6,040
11/04/72 1. Cyclotella 2,264
2. Dinobryon 1,396
3. Flagellates 1,057
4. Melosira 1,057
5. Asterionella 830
Other genera 2,830
Total 9,434
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8
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 ( .ig/l )
06/28/72 01 16.1
02 32.3
03 20.0
08/26/72 01 2.7
02 3.7
03 2.3
11/04/72 01 5.5
02 5.7
03 3.9
C. Limiting Nutrient Study:
Because of a loss of about 20% of the inorganic nirogen in
the assay sample between the time of collection and the begin-
ning of the assay, the results are not indicative of lake con-
ditions at the time of sampling. The lake data indicate that
phosphorus was limiting in November (N/P ratio = 17/1), and
nitrogen was limiting in June (N/P = 7/1) and August (N/P =
9/1).
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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 tribu-
tary sites indicated on the map (page vi), except for May when extra sam-
ples were collected. Sampling was begun in October, 1972, and was com-
pleted in September, 1973.
Through an interagency agreement, stream flow estimates for the year
of sampling and a 11 normalized or average year were provided by the
Minnesota District Office of the U.S. Geological Survey for the tributary
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 unsam-
pled “minor tributaries and immediate drainage” (“ZZ” of U.S.G.S.) were
estimated by using the means of the nutrient loads, in lbs/mi 2 /year, at
stations B-i and C-i and multiplying the means by the ZZ area in mi 2 .
The operators of the Stiliwater, Bayport, and Oak Park Heights, Minne-
sota, wastewater treatment plants provided monthly effluent samples and
corresponding flow data. However, the communities of Taylors Falls, Minne-
sota, and St. Croix Falls, Hudson, New Richmond, and River Fails, Wisconsin,
did not participate in the Survey, and nutrient loads from these sources
were estimated at 2.5 lbs P and 7.5 lbs N/capita/year.
* See Working Paper No. 1.
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10
In the following loading tables, the nutrient loads attributed to
the St. Croix River are those measured at station A-l minus the Taylors
Falls and St. Croix Falls estimated loads; and the loads given for the
Kinnickinnic River are those measured at station D-l minus the estimated
River Falls loads.
However, the estimated phosphorus load from the New Richmond treatment
plant (9,250 lbs P/yr) was over twice that measured at the outlet station
(E-l) of the Willow River (4,480 lbs P/yr), indicating a rather high degree
of phosphorus sedimentation and/or biological assimilation in the river
and in Lake Mallalieu. Therefore, in this report, it is assumed that
one-half of the load measured at E-l is attributable to New Richmond and
the rest is due to non-point sources. Note, however, nitrogen loads were
not likewise adjusted; the nitrogen load attributed to the Willow River is
that measured at [ -1 minus the estimated New Richmond load.
The septic tank loads were estimated on the basis of the combined
populations of Lakeland, St. Croix Beach, and Afton (1970 Census) at
0.25 lbs P and 9.4 lbs N/capita/year.
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11
A. Waste Sources:
1 . Known Minnesota municipa1 —
Pop. Mean Receiving
Name Served Treatment Flow (mgd) Water
Taylors Falls 587 trickling 0.059* St. Croix River
filter
Stiliwater 11,205 act, sludge 1.825 Lake St. Croix
Oak Park Hts. 1,238 act. sludge 0.470 Lake St. Croix
Bayport 3,110 act. sludge 0.420 Lake St. Croix
2. Known Wisconsin municipal** -
Pop. Mean Receiving
Name Served Treatment Flow (mgd) Water
St. Croix 1,425 trickling 0.271 St. Croix River
Falls filter
New Richmond 3,700 trickling 0.356 Willow River
filter
Hudson 6,590 trickling 0.400 Lake St. Croix
filter
River Falls 7,230 trickling 0.695 Kinnickirinic
filter River
3. Industrial - Unknown
t Anonymous, 1974.
* Estimated at 100 gal/capita/day.
** Wisconsin STP data from McKersie, et al., 1972.
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12
B. Annual Total Phosphorus Loading - Average Year:
1 . Inputs -
lbs P1 % of
Source yr total
a. Tributaries (non-point load)
St. Croix River 530,160 81.4
Valley Branch Stream (B-i) 600 <0.1
Trout Brook 240 <0.1
Kinnickinnic River 17,440 2.7
Willow River 2,240 0.3
b. Minor tributaries & immediate
drainage (non-point load) - 23,230 3.6
c. Known municipal STP’s -
Taylors Falls 1,470 0.2
Stillwater 14,030 2.2
Oak Park Heights 13,020 2.0
Bayport 6,590 1.0
St. Croix Falls 3,560 0.5
New Richmond 2,240 0.3
Hudson 16,480 2.5
River Falls 18,080 2.8
d. Septic tanks* - 580 <0.1
e. Industrial - Unknown - -
f. Direct precipitation** - 1 ,280 0.2
Total 651,240 100.0
2. Outputs -
Lake outlet - St. Croix River 439,130
3. Net annual P accumulation - 212,110 pounds
Tstimated 2,320 contributing population (see page 9).
* See Working Paper No. 1.
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13
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
lbs NI % of
Source yr total
a, Tributaries (non-point load) -
St. Croix River 10,101,250 80.5
Valley Branch Stream (6-1) 45,550 0.4
Trout Brook 8,820 <0.1
Kinnickinnic River 449,860 3.6
Willow River 110,880 0.9
b. Minor tributaries & immediate
drainage (non-point load) - 1,470,930 11.7
c. Known municipal STP’s -
Taylors Falls 4,400 <0.1
Stiliwater 71,530 0.6
Oak Park Heights 25,870 0.2
Bayport 21,100 0.2
St. Croix Falls 10,690 <0.1
New Richmond 27,750 0.2
Hudson 49,420 0.4
River Falls 54,220 0.4
d. Septic tanks* - 21,810 0.2
e. Industrial - Unknown - -
f. Direct precipitation** - 79,090 0.6
Total 12,553,170 100.0
2. Outputs -
Lake outlet - St. Croix River 12,399,580
3. Net annual N accumulation - 153,590 pounds
* Estimated 2,320 contributing population (see page 9).
See Working Paper No. 1.
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14
D. Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tributary lbs P/mi 2 /yr lbs N/mi 2 /yr
St. Croix River 81 1,542
Valley Branch Stream (B-i) 46 3,504
Trout Brook 22 802
Kinnickinnjc River 104 2,694
E. Yearly Loading Rates:
In the following table, the existing phosphorus loading
rates are compared to those proposed by Voilenweider (in press).
Essentially, his “dangerous” rate is the rate at which the
receiving waters would become eutrophic or remain eutrophic; his
“permissible” rate is that which would result in the receiving
water remaining oligotrophic or becoming oligotrophic if mor-
phometry permitted. A mesotrophic rate would be considered one
between “dangerous” and “permissible”.
Note that Vollenweider’s model may not be applicable to
water bodies with very short hydraulic retention times.
Total Phosphorus Total Nitrogen
Units Total Accumulated Total Accumulated
ibs/acr /yr 79.3 25.8 1,529.2 18.7
grams/mr/yr 8.89 2.90 171.4 2.1
Vollenweider loading rates for phosphorus
(g/m 2 /yr) based on mean depth and mean
hydraulic retention time of Lake St. Croix:
“Dangerous” (eutrophic rate) 2.20
“Permissible” (oligotrophic rate) 1.10
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15
V. LITERATURE REVIEWED
Anonymous, 1965. Report on application for waste disposal permit,
Allen S. King Plant, Northern States Power Company, Oak Park
Heights, Minnesota. MN Dept. of Health, Minneapolis.
Anonymous, 1974. Wastewater disposal facilities inventory.
MPCA, Minneapolis.
McKersie, Jerome R., Robert M. Krill, Charles Kozel, Thomas E.
DeWitt, and Danny J. Ryan; 1972. St. Croix River pollution
investigation survey. WI Dept. of Nat. Resources, Madison.
Schilling, Joel, 1974. Personal communication (sumary of
information on Minnesota lakes). MPCA, Minneapolis.
Vollenweider, Richard A., (in press). Input-output models.
Schweiz Z. Hydrol.
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VII. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
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T. IeJtAI lY L0w Ju’jV(HMAT ION IINNFSOT4
10/30/74
LA
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TRIBUTARY FLOW INFORMATION FOR MINNESOTA 10/30/74
LAP(E CODE 2747 ST. CROIX LAKE
MEAN MONTMLY FLOWS AND DAILY FLOWS
TRIRUTAPY MONTH YEAR MEAN FLOW DAY FLOW DAY FLOW DAY FLOW
274781 10 72 9.25 14 8.90
II 72 9.80 5 12.00
1? 72 9.00 2 9.00
1 73 9.40
2 73 9.30 3 9.20
3 73 10.60 4 9.50
4 73 10.10 8 10.00
5 71 10.70 2 13.00 20 9.30
6 73 9.10 9 8.60
7 73 9.00 18 9.10
6 73 12.00 12 0.0
9 73 14.00 29 20.00
27A7C1 10 72 0.78 14 0.60
11 72 0.31 5 0.70
1? 7 ? 0.28 2 0.30
73 0.63
2 73 0.30 3 0.30
3 73 1.52 4 0.80
6 73 26.50 8 21.00
5 73 6.63 2 16.00 20 2.60
6 73 1.87 9 1.40
7 73 1.60 28 1.60
9 73 1.30 12 1.10
9 73 3.00 29 4.50
274701 10 7? 108.00 14 123.00
II 77 178.00 5 252.00
1 ? 7’ 96.00 2 102.00
1 73 102.00
2 73 91.20 3 97.00
3 73 727.00 4 3030.00
4 71 70.40
5 73 S6.40 2 49.00 20 54.00
6 73 109.00 9 130.00
7 73 44.30 18 39.40
9 73 97.40 12 124.00
9 73 75.60 29 80.90
?7A7E1 10 7 46.40 14 53.00
11 7? 76.50 5 108.00
1? 7? 41.30 2 44.00
1 73 43.90
73 40.Ifl 3 42.00
1 71 313.00 4 1303.00
6 73 30.30 8 29.00
5 73 37.20 2 26.00 20 23.00
6 73 46.90 9 56.00
7 73 19.00 18 16.90
8 73 41.90 1? 53.30
9 71 37.50 29 34.80
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W1H(JTA Y FLOW INFO WATION FOW MINNESOTA
10/30/74
LA(F CODE ?7A7
ST. C OIX LAt(E
MEAN MONTHLY FLOI S AND •)AILY FLOWS
TPI8JTA Y
MONT-I YEAR
‘AEAN FLOW DAY
FLOW DAY
FLOw hAY
FLOW
?7A7Z7 10
7’
‘ .63.00
14
522.00
i i
7?
609.00
5
864.00
1
7?
?7 1.eO
2
288.00
1
71
?Q0. 0
2
73
?‘ 7.C 0
3
279.00
3
73
1000.00
4
261.00
4
73
700.00
8
666.00
5
73
750.i 0
2
531.00
F,
73
530. Oi,)
9
63Y.00
7
73
243.00
18
216.00
8
71
36 .C0
12
378.00
0
73
351.(.0
477.00 20
468.00
477.00
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APPENDIX B
PHYSICAL and CHEMICAL DATA
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STOPET E1PfEVaL DATF 74/10/30
?7A70 I
‘.4 54 00.0 09? 46 25.0
Sr cporx LA (E
?7 MINNESOTA
1 1FPALES
3
2111202
0017 FEET DEPTH
1)A TE
TO
7?/l 1/0’ .
TPAF r)FPT4
OF
1)AY FEET
17 30 0000
14 10 0000
14 30 0000
3 7I 7
C1ILPPHYL
A
U(, /L
16. IJ
?. 7J
55J
00010
003JO
00071
00094
00400
00410
00630
00610
00665
00666
DATE
TIMF
DEPTH
AT P
DO
TPANSP
CNDUCTVY
PH
1 ALK
NO? .NO3
NH3—N
PHOS—TOT
PHOS—DIS
FPO’
OF
TEMP
SECCHI
FIELD
CACO3
N—TOTAL
TOTAL
TO
DAY
FFET
CENT
‘ 1G/L
INCHES
MICROMHO
SU
MG/L
MG/L
MG/L
P46/L P
MG/L P
1 ?/Oh/
17 10 0000
?‘. ‘
10.?
60
165
7.63
8?
0.060
0.050
0.032
0.020
17 10 0015
7 O.’
7.7
150
7.37
81
0.130
0.110
0.036
0.025
7?/0M/ - .
14 0 0000
141
7.00
61
0.230
0.200
0.066
0.063
I ’. 10 000’.
2 1.J
5.3
140
7.10
14 10 0015
I.O
5.4
140
7.10
60
0.250
0.210
0.061
0.049
72/11/04
14 10 0000
4H
215
7.50
76
0.240
0.110
0.034
0.020
14 30 0004
6.5
10.4
205
7.50
78
0.250
0.110
0.038
0.021
14 10 0008
6.5
10.4
210
7.50
78
0.240
0.100
O.03H
0.022
J VALUE KNOWN TO F It. EQPO4
-------
STORET ‘ ETP1EVAL DATE 74/10/30
DATE
F Oh
TO
TIME DFPTpI
OF
DAY FEET
3?’17
C PIL P PH YL
A
UG/L
?7A702
44 57 20.0 09? 45 30.0
ST CPOIX LA’
-------
STORET RETRIEVAL DATE 74/10/30
?7A7 03
45 01 52.0 09? 46 07.0
ST CROIX LAKE
27 MINNESOTA
1 1EPALES
3
2111202
002? FEET DEPTH
DATE
FPOP
TO
7?/0B/?
7?/I 1/04
TIME DEPTH
O .
DAY FEET
18 P5 0000
15 40 OOJO
15 15 0000
3’21 7
CHLP PHYL
A
20.OJ
7 .3j
3 .QJ
00010
00300
00077
00094
00400
00410
00630
00610
00665
00666
DATE
TIME
DEPTH
WATER
DO
TIRANSP
CNDUCTVY
PH
1 ALK
N02&NO3
NH3—N
PHOS-TOT
PHOS—DIS
FROM
OF
TEMP
SECCHI
FIELD
CACO3
N—TOTAL
TOTAL
TI)
DAY
FEET
CENT
MG/L
INCHES
MICROP4HO
SU
MG/L
MG/L
MG/L
MC /L P
HG/L P
7?/06/2
18 15 0000
26.u
P.O
36
140
7.23
72
0.060
0.120
0.060
0.036
18 15 0015
21.4
7.4
135
7.28
71
0.080
0.130
0.055
0.036
7?/0R/?
15 40 0000
36
120
7.30
50
0.250
0.140
0.087
0.054
15 40 0004
19.4
6.5
120
7.20
49
0.240
0.130
0.084
0.052
15 40 0015
18.3
6.?
120
7.20
49
0.250
0.140
0.080
0.054
15 4Q 0021
18.?
6•3
120
7.20
48
0.240
0.140
0.087
0.052
15 40 092R
18.1
6.1
120
7.?0
55
0.250
0.160
0.092
0.055
7?/)I/04
15 15 0000
47
215
7.50
74
0.200
0.090
0.02Q
0.015
15 15 0004
7.0
10.6
208
7.50
75
0.190
0.060
0.027
0.017
15 15 O )15
5.0
10.6
203
7.50
76
0.200
0.050
0.028
0.014
15 IS 0026
5.0
10.6
205
7.50
76
0.200
0.060
0.029
0.014
J V LUF PcWO . N TO 3E rr ER O
-------
APPENDIX C
TRIBUTARY and WASTEWATER
TREATMENT PLANT DATA
-------
STO ET ETRTEVAL )ATE 74/10/50
2747A1 LS27A7A I
45 03 30.0 09? 48 00.0
ST CROIX UVEP
27 7.5 STILLWATFR
I/LAPcE ST CROIX
AT INT HRDC, RETW STILLWATE e& HOULTON
11EPALES 2111204
4 0000 FEET DEPTH
10f 30 006 00610 00611 00665
DATE TIM OFDT I Nu? JO3 TOT KJEL NH3-N PHOS—DIS PHOS-TOT
FQ OM OF ‘4—T’)TAL N TOTAL URTHO
T0 DAY FFFT MG/L ‘IG/t MG/L MG/L P M&/L P
7?/10/l4 14 30 0.1$ 0 0.700 O. Ob2 0.014 0.050
7?/11/0S 12 30 O.?34 fl. -,f,0 0.138 0.017 0.056
71/04/0U 10 00 0.60(J 1.c4 0 0.013 0.012 0.OM O
71/0 /02 0 15 0.070 0. 70 0.010 0.006 0.050
71/05/20 14 00 0.061 1.100 o. O Oc< 0.011 0.050
71/06/09 14 00 ( ‘.075 1. OC 1.016 0.012 0.057
71/u7/1 1700 o.oioc 0.7? ’) 0.013 0.013 0.055
71/0’ /17 15 45 0.0I0 1.260 0.021 0.014 0.057
71/09/29 09 00 U.1’.3 O. 4) 1.049 0.026 0.085
I c VALUF KNOWN TO RE LESS
ThAN INDICATED
-------
STET ETPTFVAL flAT 7 /1 /30
?7t7A2 27A4E1
44 4 00.0 09? 49 00.0
sr c oi RIVER
27 7.5 PRESCOT/HAST
0/LAKE ST CROIX
US 10 HPDG L PI ESCOTT WI
1 IFPALES
4
2111204
0000 FEET DEPTH
DATE
TIMF
flF T’-l
(O 7 NO3
TOT KJ L
NH3—N
Pr40$—DIS
PHOS-TOT
F 0M
O
N-TOTAL
N
TOTAL
ORTHO
TO
DAY
F T
Mh/L
‘ lOlL
N1(,/L
M5/L p
M( /L P
72/ 10/14
U.4?4
0.P 5O
0.079
0.038
0.075
72/Il/OS
13
10
0.310
0.720
0.115
0.025
0.050
72/12/0?
15
25
0.?94
O.6R 0
3.046
0.019
0.044
71/01/14
13
00
( .S60
l. ?6()
0.130
0.024
0.035
71/07/03
13
£.O
0.6( 0
1. 00
0.027
0.035
71/03/04
13
0
0.670
1.540
0. O SP
0.021
0.035
71/06/O
II
00
‘ .? 0
0.750
0.054
0.020
0.050
73/05/07
1’
30
1’.Ofl
0.740
3.060
0.007
0.050
73/PS/19
10
-.0
0.019K
(‘.E +0
0.00 5K
0.005K
0.045
71/0S/?0
jc
10
0.055
1.700
0.010
0.007
0.035
71/06/09
15
9fl
0.350
1.100
0.132
0.019
0.040
71/07/1
17
45
O.1 6
O.h90
0.0??
0.00 5K
0.015
73/OM/1?
10
10
0.010K
1.000
0.CiO
0.011
0.040
73/0 /?9
09
45
0.343
0.360
0.027
0.031
K VALUE KNOWN TO E LESS
THAN INDICATED
-------
STO ET QETRIEVAL DAT’ 74/10/30
?747B1 LS2747B1
44 54 30.0 092 46 00.0
VALLEY I3PANC,-j STAEAM
27 7.5 HUDSON
1/LAJcE ST CROIX
ST HWY 95 RDG RETW AFTON ST
1 1EPALES 2111204
4 0000 FEET
MAPYS PT
DEPTH
00630
00625
00610
00671
00665
NO2 .N03
TOT KJFL
NH3—N
P OS—DIS
PHOS-TOT
N—roTaL
N
TOTAL
OPTHO
lf/L
iG/L
MG/L
MG/L P
MG/L P
DATE
FPDM
TO
72/10/14
72/ I 1/05
72/12/0?
73/01/14
73/02/03
73/03/04
7 3/0 “/0 A
73/05/0?
73/05/20
73/06/09
73/07/lu
73/3M/I?
73/09/ ?
TIMF DEPTH
OF
DAY ’ FEET
15 30
13 ?0
14 46
i 20
13 00
10 3t)
19 110
14 30
14 30
17 16
09 45
09 15
0 • 3 F 0
o • 6Y0
?.4 0 0
2 73’.)
2 • 50 (I
‘ .53 1)
2.200
1 .660
1 .900
1.040
2.040
. 1 ?0
0.100K
0 • lOOK
0 • 130K
0 • lOOK
0. lOOK
0.630
I • 100
0 • 340
0 • JOOK
0 • 1 70
‘1.043
C l .0 IA
0.025
0.021
0 • 053
0 • 320
0.007
0 .C 11
0.03
0.052
0.0 13
0.016
0.014
0.313
0.016
0.012
0.015
0.010
0.060
0 .008
0 .005K
0.014
0.032
0.013
0.016
0.019
0.026
0.021
0.020
0.020
0.0 . 0
0.016
0 • 0 30
0.040
0.040
0.026
0.025
0. 035
K VALUE KNOWN TO BE LESS
THAN I’ DICATED
-------
STORET ET IEvAI )ATt 7 /1fl/ O
27A7C1 LS27A7C I
44 51 30.0 09? 46 30.0
T’ OUT R OK
7.5 PRESCOTT
T/LAKE ST CROIX
C i ) iiwY 21 2.5 MI S OF AFTON
11Ej- ALES 2111204
4 0000 FEET DEPTH
(0630 006 ’ S 00610 00671 00665
Ol’TF. TIME i)F°TH N07b.N03 TuT KJrL NH3—N Pp-j()S—DjS PHOS—TOT
FROM or N—TUT L N TOTAL UPTHO
TO DAY FEET M6/L Mr,/L Mu/I ic,/L H MG/L P
7?/10/14 15 55 0.?PD 1.353 0.050 0.034 0.072
7?/1I/0 13 IS 0.4? , 0.210 0.C2 1 u.O? 0.046
72/1?/02 I c 00 1.9- 0.100K 0.008 0.033 0.0 , 6
71/0I/1’e 1? 0 J.9f-0 0.100K .01f ’ 0.024 0.025
73/0?/03 13 0 1.960 0.603 0.0?4 0.0’7 0.030
71/04/08 10 .5 1.66) 0.110 0.007 0.021 0.fl?5
71/05/fl? 19 15 I.4 ) 0. 30 0.026 0.074 0.160
71/05/20 14 45 1.0’ C 1.100 r,.o10 0.017 0.035
73/O6/0 14 ‘eS 1. 10 1. 00 • .040 0.01 0.035
71/C’7/?R 17 10 1.? 0 0.160 0.024 0.026 0.045
71/OP/17 10 15 1.4’O (‘.130 0.009 0.027 0.040
71/09/?Q 09 30 1.643 0.460 fl.01? 0.038 0.065
3E LESS
K VaL(J’ KNOWN TO
THAN P’ DICATED
-------
ST’)PET RFT’ tEVAL O4TF 74/10/30
27A7D1 LS27A7D1
44 4 30.0 092 44 00.0
KINNICKINNIC RIVER
27 PIERCE Co MAP
T/L pcE ST CROIX
CO HWY F Ri)G NNE PRESCOT SMI
1 IEPALES 2111204
4 0000 FEET
WSW P FALS
DEPTH
0C630
306?
00610
00671
00665
DATE
TIME
DEPT-i
NO’F NOi
TOT KJEL
NH3-N
PHOS—DIS
PHOS—TOT
rQ M
OF
N—TOTAL
N
TOTAL
ORTHO
TO
DAY
FEET
M(/L
MG/L
M(/L
MG/L P
MG/L P
72/10/14
16
co
0.L.40
0.100K
0.0 ?
0.170
0.210
7?/1I/0
lLi
QS)
).730
0.? ()
0.061
0.128
0.170
72/1?/02
15
30
7.903
0.176
f).176
0.1%
0.220
73/01/14
13
20
J.400
0.7 0
0. Q6
0.115
0.150
7 /0?/01
1
00
3. Ilu
0.?60
Q.j47
0.126
0.155
73/03/04
13
45
‘.9 0)
7•4flØ
0.399
0.180
0.240
71/05/0?
IQ
45
1.7 0
1.700
‘). 160
0.132
0.345
73/07/IA
2Q
‘)0
‘.300
0.100K
J.010
0.094
0.130
73/0 /1?
73/oq/?0
10
10
45
00
?.7)0
i 94’-,
0.110
0.I 0
0.007
0.017
0.076
0.120
0.105
0.150
K VALUF KNOwN TO F E LESS
THAN INOICAT Q
-------
STOPET RET 1FVAL r)ATF 4/1)/30
?747E1 L 27A7E1
59 00.0 09? 45 30.0
LArcE MALLALIFU
27 7.5 HUDSON
T/LAKE ST CROIX
AT -IUDSON CITY B UG
I IEPALES
‘4
2111204
0000 FEET DEPTH
1 -3 i
0C67 5
0)f’10
00671
006 f ’5
DATE
T1M
[ )FPT-I
“lU? .NOi
TOT KJEL
Ne-fl—N
PHOS—DIS
2 H0S—IOT
FPOti
OF
‘J—TOTAL
N
TOTAL
ORTHO
TO
Y
FEET
C ’/L
i(/t
Mr,/L
M(/L P
MG/L
77/10/14
15
00
‘.0.
).25C
1.044
0.l)0F
t .0f’9
77/11/05
17
45
)•45(1
1.260
0.027
0.007
0.054
72/17/0?
14
25
1.200
0. 60
0.013
0.010
0.0Sf’
73/01/la
12
00
2.0 ’ 40
0.1 0
0.094
0.03 5
0.O+0
71/02/03
1’.
20
2.003
)•47 1)
0.0W6
0.OJP
0.045
73/03/04
1?
30
2.000
0.960
0.10?
0.03?
0.040
71/04/0k
10
15
0.096
•J. 60
0.010
0.012
0.040
73105/07
7Q
00
).( 0
1.1 )
0.013
0. O OM
0.070
7 1/Qc/7Ø
14
15
L .43’)
1. f’M()
0.03f’
0.006
0.060
71/06/0-
14
15
..40O
1.150
0.022
0.005K
0.065
71/07/1 ?0
IS
0.0’i)
1.101
). 06
0.013
0.010
7aI0 /1’
11
00
i’.0I0
0.00S
0.011
0.050
71/09/79
10
15
J.4 )
0.7 0
3.027
0.013
0.060
K VALUE KNOWN TO E LESS
THAN INDICATED
-------
STORET ?ET.flEVAL I)AT Th/I0/30
00630
‘lATE uHF Of ’TH NO’ .NO3
FRJM OF N—T0T L
I C) DAY FEET M /L
73/02/2 11 (‘0
CP(T)— 0.120
71/02/26 13 00
71/u3/0’, 11 00
CP(T)— 0.’?45
71/01/06 11 00
71/04/04 11 00
CP(T)— 0.600
73/04/0’. 11 00
71/05/01 11 00
C (T)— O.O3
71/05/03 11 00
71/06/01 II 00
CD(T)— o.is ;
71/O /O1 11 00
73/07/02 1) 00
1.000
71/07/0’ Ii 00
71/OM/07 II 00
CR 11)— 0.040
71/OP/07 I I 00
71/03/05 I I 00
C (T)— 6.000
71/09/05 13 00
71/10/01 Il 00
CP(T 1— 0.? 0
71/10/0 1 13 00
73/12/01 00 00
CP(T)— 0.170
73/12/03 24 00
74/0t/O I I 00
CP(T)— u.080
74/01/08 13 00
?7A75 1 P 027A75 1
P010191
‘.5 02 25.0 0’)2 ‘+7 30.0
sr ILLW ATE?
27 7.5 STILLWATFP
D/LAI E ST CP01.
LAI(E ST C 01X
11E ALES 2141204
4 0000 FEET
DEPTH
00625
00610
00671
00665 50051 50053
TOT KJEL
Nr 3—N
PHOS—DIS
PHOS—TOT FLOW CONDUIT
N
TOTAL
OPTrIO
DATE FLOWMGI)
MG/L
W/L
MG/L P
MG/L INSI 1460 MONTHLY
13.000
‘.600
2.600
3.100 1.990 2.100
17.600
0.970
2.100
3.150 2.500 2.200
0.480
0.077
1.930
?.450 1.530 1.600
6.600
2.20(i
2.800 1.550 2.010
8. O0
0.285
3.360
1.700 1.000 1.200
7.P00
fl.P90
1.050 2.500 2.000
12.E’) O
2.520
3.400
4.000 1.850 1.790
31.900
1.870 1.760
10.500
0.110
3.700
4.000 1.670 1.960
11.000
1.980
0.110
0.670 1.810 1.750
10.500
3.900
0.210
1.OS O 1.730 1.700
-------
ST9PET FT IEV4L i)a1 7 /l0/ 0
: 0 ‘ TI C
r)r TF T JM ))F PT - I \JO? NO I
O ’ )r i— TOTAL
To flAY FF T PAC /L
73/ ) 2/7 - I (‘0
CPU)—
7 1/37/? - 11 PC
71/01/0” II 00
CPU)— (i•4LJ
71/03/0 Ii 00
71/(’4/94 11 00
71/04/04 13 ‘ “
71/05/03 1) 00
CP(T)—
71/05/01 13 (jt )
71/06/0) II ( Ii
CP(T)— I .3- u
71,a4/91 13 (JO
71/07/0? 10 00’
C (T)—
71/07/0? 1 09
71/r /97 II 00
C 1 1) —
71/)iI/07 Ii 00
73/J- /05 I I 00
CP ( T) —
71/) /0 11 00
71/10/0’. II 00
C°( T) —
71/10/04 11 0’)
71/1)/02 II 0’)
CP IT) —
71/11/0’ 13 00
71/1’/03 II 00
CD I T) —
73/I /03 13 00
00?98 7
?7a75? 0 7A752
45 01 00.0 09? 46 0.0
t-ArP ,) IT
7.5 5FJLLWATE$
O/Lt KE ST C O1X
L J € ST CkOJX
11 ALES 141204
4 0000 rEEl
DEPTH
9C8?5
O Of ’I0
00 671
00f ’S 50051 50053
TOT KJEL
rju-fl —P J
‘ hflS—fljS
P - OS—T0T FLOw CONOUIT
N
TOTAL
0. T-ft)
‘ ATL FLOw— iGq
W”/L
‘iO/L
M(/L P
MG/L P INST 4c,D MONTHLY
?5.003L
7.000
4.200
0.450 0.3 0
9.450
1.500
1.950
?.300 0.460 0.150
9.400
0.700
4. 50
5.300 0.440 0.430
7. 00
3.024
4.500
5.900 0.425 0.480
9.300
1.027
5.080
6.700 0.470 0.450
4. 00
0.150
3.970
5.800 0.490 0. 50
0.535 0.526
‘0.700
4. O0
0.490 0.410
?.R ’ )O
O.’7fl
7.400
7.500 0.453
11.S00
1.050
5.950
7.90f) 0.420 0.350
‘. 00
0.210
0.376
1.850 0.310 0.420
• 630
-‘.800
17.9)9
-------
STOPET ET IE ,A1 UATF 74 /3O
4S 0 00.0 092 47 30.0
OAK H&HTS
7.5 STILLvi4th
U/LAKE ST C 0IX
LAKE ST C40!X
1 IEPALFS 2141204
0000 FEET
DEPTII
n063t
00675
flOf’ I O
00671
006 ’5 50051 50053
1ATF
TI F
OF. T’1
JO2 NO3
TOT KJ L
-l3—N
P’ 0S—DIS
PHOS—tOr FLOW CONDUIT
OM
OF
J—TflTAL
N
TOTAL
ORTrIO
RATE FLOW—MGU
TO
¶)AY
FF T
IG/L
‘ /L
l&/L
MC,/L P
MG/L P INST r4GF) MONIMLY
71/C?/?6
I I 00
CP(T)—
3.6u3
12. 00
1.6F 0
12.600
0.162 0.136
74/I)?/?f
I 3 00
71/03/06
11 uO
CPT)—
9. 400
0.620
10.400
12.500 0.200 0.206
71/03/06
11 00
71/06/04
1 00
C (T)—
1.73 5
11. 0
0.041
13.600
14.700 0.111 0. I OH
71/04/06
13 (‘0
71/0S/0
11 00
CPU)—
‘J.330
126.000
15.100
10.350
36.700 0.116 0.102
73/05/01
13 ‘ 0
73/06/01
10 00
C (T)—
1.301
76.000
11.1 0
71.900
2’-..000 0.10? 0.9B0
71/”6/OI
j7 00
71/07/UI
II 00
CP(T)—
0.290
2P.fl0t ’
10.000
9.220
13. 00 0.098 0.101
71/07/01
11 00
71/11/07
11 00
C (T)—
0.580
10.500
0.670
1.570
4.400 1.910 1.660
73/11/0?
11 00
------- |