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Watershed Restoration Plan Fact Sheet for Assessment Point MN-4

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 

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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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C i t y o f  C i t y o f  

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  

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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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MN-9

MN-14

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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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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