Impaired Water - Willow Creek (Willow Creek)
Washington, Waukesha County, Wisconsin
FX07, MI03
18800
0.00 - 2.80
2.80
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
This portion of Willow Creek was listed in 2010 due to high fecal coliform concentrations and recreational restrictions. The Milwaukee River TMDL restoration plan covers the Willow Creek E. coli listing and was approved in 1998.

Evaluations of phosphorus and biology in 2014 and 2020 showed potential impairment, but further monitoring is needed.
Listing Details
Pollutant
Fecal Coliform
Listed For
Recreation
Impairments
Recreational Restrictions - Pathogens
Current Use
Restricted Recreation
Listing Status
TMDL Approved
Attainable Use
Full Body Contact - Swimming, Boating
Priority
Not Applicable
Designated Use
Full Body Contact - Swimming, Boating
303(d) ID
2010-23
Listing Date
4/1/2010
Impaired Water Notes
The Milwaukee River Watershed TMDL was approved by the EPA on March 9, 2018 and covers waters in the basin impaired for Total Phosphorus, Sediment/Total Suspended Solids, and bacteria (E. coli and Fecal Coliform).
Date
3/9/2018

Impaired Water Notes
Willow Creek is part of the Menomonee Watershed. Willow Creek is impaired for recreational restrictions because of high concentrations of Fecal Coliform bacteria. Fecal Coliform concentrations exceed the 400 cfu/100mL threshold 24% of time annually and 13% of time May through September based on modeling data calibrated and validated from over 30 years of monitoring data (assessment point MN-4). Data is from the MMSD Corridor database housed at USGS. Land use is primarily commercial (45%) and residential (30%) in this area.
Date
10/23/2009