mn 4 fact sheet
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8/2/2019 Mn 4 Fact Sheet
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8/2/2019 Mn 4 Fact Sheet
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Assessment Point: MN-4
The following data are excerpts from multiple reports. While the same location in theMenomonee River watershed is represented, the assessment point IDs differ. Throughout
the following data, Assessment Point MN-4 is also represented by:
o Reach 820
o Willow Creek
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B R O O K F I E L D B R O O K F I E L D
C i t y o f C i t y o f
M I L W A U K E E M I L W A U K E E
C i t y o f C i t y o f
G L E N D A L E G L E N D A L E
C i t y o f C i t y o f
C E D A R B UR G C E D A R B U R G
C it y of C it y o f
W AU W A T OS AW AU W AT OS A
C it y of Ci t y of
ME Q UO N M EQ UO N
UPPER MENOMONEE RIVER
LOW E R MENOMONEE RIV E R
LI T TLE MENO M O N E E RIVER
UNDERWOOD CREEK
LILLY CREEK
WILLO W C R E EK
BUTLER DITCH
NOR-X-WAY CHANNEL
DOUSMAN DITCH
WEST BR ANCH MENOMO N E E RIV E R
NORTH BRANCH MENOMONEE RIVER
LITTLE MENOMONEE CREEK
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B R O O K F I E L D B R O O K F I E L D
C i t y o f C i t y o f
M E Q U O N M E Q U O N
C i t y o f C i t y o f
M I L W A U K E E M I L W A U K E E
C i t y o f C i t y o f
W A U W A T O S AW A U W A T O S A
C i t y o f C i t y o f
G L E N D A L E G L E N D A L E
UPPER MENOMONEE RIVER
LOW E R MENOMONEE RIV E R
LI T TLE MENO M O N E E RIVER
UNDERWOOD CREEK
LILLY CREEK
WILLO W C R E EK
BUTLER DITCH
NOR-X-WAY CHANNEL
DOUSMAN DITCH
WEST BR ANCH MENOMO N E E RIV E R
NORTH BRANCH MENOMONEE RIVER
LITTLE MENOMONEE CREEK
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B R O O K F I E L D B R O O K F I E L D
C i t y o f C i t y o f
M E Q U O N M E Q U O N
C i t y o f C i t y o f
M I L W A U K E E M I L W A U K E E
C i t y o f C i t y o f
W A U W A T O S AW A U W A T O S A
C i t y o f C i t y o f
G L E N D A L E G L E N D A L E
MN-11
MN-9
MN-14
MN-2
MN-5
MN-15
MN-13
MN-4
MN-7
MN-8
MN-3
MN-6
MN-1
MN-10
MN-17
MN-12
MN-8 MN-9
MN-7
MN-6
MN-5
MN-4
MN-3 MN-2
MN-1
MN-16 MN-17
MN-15
MN-14
MN-13
MN-11
MN-12
MN-10
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A p p l e t o n A v .
MN-4
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A p p l e t o n A v .
MN-4
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Constituent Measure Standard/Target
Geometric Mean Standard 200 counts/100 ml
Not to Exceed Standard 400 counts/100 ml
Dissolved Oxygen (DO) Minimum Concentration Standard 5 mg/l
Total Suspended Solids (TSS)
USGS Median TSS Reference Concentration (estimated
background concentration) 17.2 mg/l
Total Phosphorus (TP) Planning Guideline 0.1 mg/l
Flashiness
Richards Baker Flashiness Index (quantifies the frequencyand rapidity of short-term changes in stream flow; the index
ranges from 0 - 2, with 0 being constant flow) indicator only
Menomonee River Standards/Targets
Fecal Coliform
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Figure Overall Project
Team Assessment
Analysis
Dissolved oxygenby flow
Good to Moderate Note that the largest decreases in dissolved oxygen concentrations occur at low flows. This is partly due to a combinationof decreased water agitation and higher temperatures (low flow conditions are often naturally associated with the warm
summer months). Decreases during low flow conditions may be exacerbated by excess organic material and biochemical
oxygen demand.
Fecal coliform by
flow
Moderate to Poor Generally, a pollutant that is present at high concentrations during high flows and low concentrations during low flows
(fecal coliform, in this case) is attributed primarily to non-point sources. Note that during any period with the high flows,
fecal coliform counts exceed the regulatory standard roughly 75% of the time. During low flows and dry conditions, the
standard is met well over 75% of the time. This would be the safest time for any recreational uses (boating, swimming,
wading, etc.), although the amount of water in the stream may limit recreational use to wading.
Phosphorus by
flow
Good Concentrations of phosphorus only exceed the planning guideline at moist conditions and high flows. This suggests that
the excess phosphorus is primarily from non-point sources. The similarities between the phosphorus and suspended solids
data suggest that the phosphorus may be associated with suspended sediment.
Suspended solids
by flow
Very Good to
Good
The concentrations of suspended solids increase with increased flows, suggesting contributions from non-point sources.
The suspended solids may come from runoff that carries a sediment load, from stream bank erosion, or re-suspended
stream sediments.
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Flashiness Index
Reach Description Richards Baker Flashiness Index
820 Willow Creek 0.44
Average Daily Flow
Willow Creek (820)
0
20
40
60
80
100
120
140
160
180
200
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
A V E R A
G E D A I L Y F L O W (
C F
S
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Existing Water Quality Data
AssessmentPoint
Water QualityIndicator
Statistic ConditionExisting
Mean (cells per 100 ml) 1,244Fecal Coliform Bacteria(annual)
Percent compliance with single samplestandard (<400 cells per 100 ml)
76
MN-4Willow Creek
Geometric mean (cells per 100 ml) 183
Days of compliance with geometric meanstandard (<200 cells per 100 ml)
218
Mean (cells per 100 ml) 794Fecal Coliform Bacteria(May-September: 153days total) Percent compliance with single sample
standard (<400 cells per 100 ml)87
Geometric mean (cells per 100 ml) 125
Days of compliance with geometric meanstandard (<200 cells per 100 ml)
125
Dissolved Oxygen Mean (mg/l) 8.9
Median (mg/l) 9.1
Percent compliance with dissolved oxygenstandard (>5 mg/l)
96
Total Phosphorus Mean (mg/l) 0.036
Median (mg/l) 0.025
Percent compliance with recommendedphosphorus standard (0.1 mg/l)
93
Total Nitrogen Mean (mg/l) 0.73
Median (mg/l) 0.65
Total Suspended Solids Mean (mg/l) 9.1
Median (mg/l) 7.3
Copper Mean (mg/l) 0.0030
Median (mg/l) 0.0012
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0
40
80
120
160
200
240
280
320
360
400
0 -1
1 -2
2 - 3
3 -4
4 - 5
5 - 6
6 -7
7 - 8
8 - 9
9 -1 0
> 1 0
Average DO (mg/L)
A v e r a g e N u
m b e r o f D a y s P e r Y e a r
Menomonee River @ Willow Creek (RI 820)
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Menomonee River @ Willow Creek (RI 820)
0
40
80
120
160
200
240
280
320
360
400
0 -4 0 0
4 0 0 - 6 0 0
6 0 0 -1 0 0 0
1 0 0 0 -2 0 0 0
2 0 0 0 - 3 0 0 0
3 0 0 0 -4 0 0 0
4 0 0 0 - 5 0 0 0
> 5 0 0 0
Average Fecal Coliform (#/100ml)
A v e r a g e N u m b e r o f D a y s P e r Y e a r
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Menomonee River @ Willow Creek (RI 820 )
0
40
80
120
160
200
240
280
320
360
400
0 - 0 . 0 5
0 . 0 5 - 0 .1
0 .1 - 0 .1 5
0 .1 5 - 0 .2
0 .2 - 0 .2 5
0 .2 5 - 0 . 3
0 . 3 - 0 . 3 5
0 . 3 5 - 0 .4
0 .4 - 0 .4 5
0 .4 5 - 0 . 5
> 0 . 5
Average TP (mg/L)
A v e r a
g e N u m b e r o f D a y s P e r Y e
a r
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Menomonee River @ Willow Creek (RI 820)
0
40
80
120
160
200
240
280
320
360
400
0 -2 5
2 5 - 5 0
5 0 -7 5
7 5 -1 0 0
1 0 0 -1 2 5
1 2 5 -1 5 0
1 5 0 -1 7 5
1 7 5 -2 0 0
>2 0 0
Average TSS (mg/L)
A v e r a g e N
u m b e r o f D a y s P e r Y e a r
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1
10
100
0 10 20 30 40 50 60 70 80 90 100
Flow Duration Interval (%)
C o n c e n t r a
t i o n ( m g / L )
Flow Conditions Regulatory Standard (5 mg/L) Box & Whiskers
Willow Creek – Reach 820Dissolved Oxygen
Modeled Flow Data
Dry C on d iti on s
Lo w F lo ws
M id - ra nge F lo ws
H ig h F lo ws
M o ist C on d iti on s
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1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
0 10 20 30 40 50 60 70 80 90 100
Flow Duration Interval (%)
C o n c e n t r a t i o
n ( c f u / 1 0 0 m L )
Flow Conditions Regulatory Standard (400 cfu/100 mL) Box & Whiskers
Willow Creek – Reach 820
Fecal Coliform
Modeled Flow Data
D ry Con diti on s
Low F lows
M i d -ra n ge F lows
Hig h F lows
Mo ist C on diti ons
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0.01
0.10
1.00
0 10 20 30 40 50 60 70 80 90 100
Flow Duration Interval (%)
C o n c e n t r a
t i o n ( m g / L )
Flow Conditions Planning Standard (0.1 mg/L) Box & Whiskers
Willow Creek – Reach 820Total Phosphorus
Modeled Flow Data
Dry C on d iti on s
Lo w F lo ws
M id - ra nge F lo ws
H i g h F lo ws
M o ist C on d iti on s
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1
10
100
1000
0 10 20 30 40 50 60 70 80 90 100
Flow Duration Interval (%)
C o n c e n t r a
t i o n ( m g / L )
Flow Conditions Reference Concentration (17.2 mg/L) Box & Whiskers
Willow Creek – Reach 820Total Suspended Solids
Modeled Flow Data
Dry C on d iti on s
Lo w F lo ws
M id - ra nge F lo ws
H i g h F lo ws
M o ist C on d iti on s