Mn 10 Fact Sheet

8/2/2019 Mn 10 Fact Sheet

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Assessment Point: MN-10

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-10 is also represented by:

o Reach 861o 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 I L W A U K E E M I L W A U K E E


G L E N D A L E G L E N D A L E

City ofCity of

CED A RBUR GCE DA RBURG

C it y ofC i t y o f

WAU WA TOS AWAU WAT OS A

C it y ofC i t y o f

ME QUO NM EQ UO N

UPPER MENOMONEE RIVER

LOWER MENOMONEE RIVER

LITTLEMENOMONEERIVER

UNDERWOOD CREEK

LILLY CREEK

WILLOWCREEK

BUTLER DITCH

NOR-X-WAY CHANNEL

DOUSMAN DITCH

WEST BRANCH MENOMONEERIVER

NORTH BRANCH MENOMONEE RIVER

LITTLE MENOMONEE CREEK


4/2494

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M E Q U O N M E Q U O N


MI L W A U K E E MI L W A U K E E

Ci ty o fCi ty o f

W A UWA T O SAWA UWA TOSA



UPPER MENOMONEE RIVER

LOWER MENOMONEE RIVER

LITTLEMENOMONEERIVER

UNDERWOOD CREEK

LILLY CREEK

WILLOWCREEK

BUTLER DITCH

NOR-X-WAY CHANNEL

DOUSMAN DITCH

WEST BRANCH MENOMONEERIVER

NORTH BRANCH MENOMONEE RIVER

LITTLE MENOMONEE CREEK


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M E Q U O N M E Q U O N


MI L W A U K E E M I L W A U K E E

Ci ty o fCi ty o f

W A UWA T O SAWA UWA TOSA



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-8MN-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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10/24

Figure Overall Project

Team Assessment

Analysis

Dissolved oxygenby flow

Good to Moderate Note the decline in dissolved oxygen concentrations during low flows. This is likely due to a combination of decreasedwater agitation and higher temperatures (low flow conditions are often associated with the warm summer months). Also,note that dissolved oxygen concentrations decline during high flows, suggesting that the stormwater runoff may carry a

relatively large organic load and biochemical oxygen demand in the stream.

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 periods with the highest flows,

fecal coliform counts exceed the regulatory standard more the 75% of the time. During low flows, the standard is

consistently met. 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 are highest at high flows. This suggests the prevalence of non-point loads of phosphorus.Unlike many of the other sites, the phosphorus concentrations do not appear to correlate well with suspended solids

concentration data.

Suspended solids

by flow

Moderate 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 FlashinessIndex

861 Little Menomonee Creek 0.31

Average Daily Flow

Little Menomonee Creek (861)

0

5

10

15

20

25

30

35

40

45

50

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

AVERAG

EDAILYFLOW(

CFS


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Existing Water Quality Data

AssessmentPoint

Water QualityIndicator

Statistic ConditionExisting

Mean (cells per 100 ml) 4,970Fecal Coliform Bacteria(annual)

Percent compliance with single samplestandard (


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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

9-10

>10

Average DO (mg/L)

AverageNu

mberofDaysPerYear

Menomonee River @ Little Menomonee Creek (RI 861)


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0

40

80

120

160

200

240

280

320

360

400

0-400

400-600

600-1000

1000-2000

2000-3000

3000-4000

4000-5000

>5000

Average Fecal Coliform (#/100ml)

AverageNumberofDaysPerYear


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Menomonee River @ Little Menomonee Creek (RI 861 )

0

40

80

120

160

200

240

280

320

360

400

0-0.05

0.05-0.1

0.1-0.15

0.15-0.2

0.2-0.25

0.25-0.3

0.3-0.35

0.35-0.4

0.4-0.45

0.45-0.5

>0.5

Average TP (mg/L)

Avera

geNumberofDaysPerYe

ar


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0

40

80

120

160

200

240

280

320

360

400

0-25

25-50

50-75

75-100

100-125

125-150

150-175

175-200

>200

Average TSS (mg/L)

AverageN

umberofDaysPerYear


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1

10

100

0 10 20 30 40 50 60 70 80 90 100

Flow Duration Interval (%)

Concentra

tion(mg/L)

Flow Conditions Regulatory Standard (5 mg/L) Box & Whiskers

Little Menomonee Creek Reach 861Dissolved Oxygen

Modeled Flow Data

DryConditions

LowFlows

Mid-rangeFlows

HighFlows

MoistConditions


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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


Concentratio

n(cfu/100mL)

Flow Conditions Regulatory Standard (400 cfu/100 mL) Box & Whiskers

Little Menomonee Creek Reach 861

Fecal Coliform

Modeled Flow Data

DryConditions

LowFlows

Mid-rangeFlows

HighFlows

MoistConditions


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0.01

0.10

1.00

0 10 20 30 40 50 60 70 80 90 100


Concentra

tion(mg/L)

Flow Conditions Planning Standard (0.1 mg/L) Box & Whiskers

Little Menomonee Creek Reach 861Total Phosphorus

Modeled Flow Data

DryConditions

LowFlows

Mid-rangeFlows

HighFlows

MoistConditions


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1

10

100

1000

0 10 20 30 40 50 60 70 80 90 100


Concentra

tion(mg/L)

Flow Conditions Reference Concentration (17.2 mg/L) Box & Whiskers

Little Menomonee Creek Reach 861Total Suspended Solids

Modeled Flow Data

DryConditions

LowFlows

Mid-rangeFlows

HighFlows

MoistConditions

Documents

Mn 10 Fact Sheet