Milwaukee, Waukesha County, Wisconsin
MI03
16700
2.84 - 8.54
5.70
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
This segment of Underwood Creek was identified as impaired in the 2010 cycle for recreation restrictions due to bacteria (fecal coliform). During the 2018 cycle both phosphorus and chloride were identified as pollutants on this stream segment, which was confirmed by the 2020, 2022, and 2024 cycles. This water is covered by the Menomonee River Watershed Nine Key Plan, approved in January 2022.Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
Impairment Unknown
Current Use
Unsupported Aquatic Life
Listing Status
TMDL Approved
Attainable Use
Default - Fish and Aquatic Life
Priority
Not Applicable
Designated Use
Default - Fish and Aquatic Life
303(d) ID
2018-002
Listing Date
4/1/2018
Impaired Water Notes
This water was assessed during the 2018 listing cycle; new total phosphorus sample data exceeded 2018 WisCALM listing criteria for the Fish and Aquatic Life use, however, available biological data did not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) averages scored in the "poor" condition category).
Date
6/5/2017
Impaired Water Notes
This water was assessed during the 2020 listing cycle; new total phosphorus sample data exceed 2020 WisCALM listing criteria for the Fish and Aquatic Life use, however, available biological data and temperature data do not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the "poor" condition category). Based on the most updated information, no change in existing impaired waters listing is needed.
Date
6/12/2019
Impaired Water Notes
This water was assessed during the 2022 listing cycle; new total phosphorus sample data exceed 2022 WisCALM listing criteria for the Fish and Aquatic Life use, however, available biological data (macronivertebrates) do not show impairment. Based on the most updated information, no change in existing impaired waters listing is needed.
Date
4/14/2021
Pollutant
Chloride
Listed For
Fish and Aquatic Life
Impairments
Acute Aquatic Toxicity, Chronic Aquatic Toxicity
Current Use
Unsupported Aquatic Life
Listing Status
303d Listed
Attainable Use
Default - Fish and Aquatic Life
Priority
Low
Designated Use
Default - Fish and Aquatic Life
303(d) ID
2018-001
Listing Date
4/1/2018
Impaired Water Notes
This water was assessed during the 2018 listing cycle; new chloride sample data exceed 2018 WisCALM listing criteria for the Fish and Aquatic Life use.
Date
6/5/2017
Impaired Water Notes
This water was assessed during the 2022 listing cycle; new chloride sample data exceed 2022 WisCALM listing criteria for the Fish and Aquatic Life use.
Date
4/14/2021
Pollutant
Unknown Pollutant
Listed For
Fish and Aquatic Life
Impairments
NA
Current Use
Unsupported Aquatic Life
Listing Status
Pollutant Removed
Attainable Use
Default - Fish and Aquatic Life
Priority
Delisted 2018
Designated Use
Default - Fish and Aquatic Life
303(d) ID
2012-110
Listing Date
4/1/2012
Impaired Water Notes
This water was assessed during the 2012 listing cycle and does violate the biological threshold for an FAL impairment decisions . Three poor fIBI scores were collected from the same station in three consecutive years. This water was originally listed in 2010 due to high fecal coliform and recreational restrictions.
Date
10/21/2011
Impaired Water Notes
The original fIBI scores were artificially lower; corrected fIBI scores show no impairment. Macroinvertebrate samples also show no impairment. The Degraded Biological Impairment is proposed for delisting.
Date
6/5/2017
Pollutant
Fecal Coliform
Listed For
Recreation
Impairments
Recreational Restrictions - Pathogens
Current Use
Restricted Recreation
Listing Status
TMDL Approved
Attainable Use
Recreation
Priority
Not Applicable
Designated Use
Recreation
303(d) ID
2010-27
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
Underwood Creek has been extensively modified, has concrete lining and drop structures and experiences flashy flow conditions. At modeled assessment pointsin Underwood Creek, based on monitoring data, fecal coliform counts exceed 400 cfu/100 ml 39% of time MN-13; 29% at MN-14 annually and 23% and 14% of time from May-September (which exceed WisCALM listing thresholds). 75% of the Fecal Coliform urban nonpoint loads cannot be explained but they could be caused by illicit connections or leaky sewers. Fecal coliform loadings from Underwood Creek contribute to high fecal coliform levels in the Menomonee River Watershed.
Date
11/25/2009