Impaired Water - Otter Creek (Otter Creek)
Iowa County, Wisconsin
LW11
1237100
0.00 - 14.89
14.89
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Otter Creek is impaired due to degraded habitat because of excessive sediment loading from surround agricultural lands to the stream.

This water was assessed during the 2014 listing cycle; total phosphorus sample data exceed 2014 WisCALM listing criteria for the Fish and Aquatic Life use, however, no biological data (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scores) were available to assess biological impairment).

This water was assessed during the 2016 listing cycle; total phosphorus sample data exceed 2016 WisCALM listing criteria for the Fish and Aquatic Life use, however, available biological data do not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the "poor" condition category). This water was also assessed for temperature and sample data did not exceed 2016 WisCALM listing criteria for the Fish and Aquatic Life use.

This water was assessed during the 2018 listing cycle; total phosphorus sample data exceed 2018 WisCALM listing criteria for the Fish and Aquatic Life use, however, available biological data do not indicate impairment (i.e. no macroinvertebrate Index of Biotic Integrity (IBI) scored in the "poor" condition category).
Listing Details
Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
Impairment Unknown
Current Use
WWSF - Warmwater Sport Fishery
Listing Status
303d Listed
Attainable Use
WWSF - Warmwater Sport Fishery
Priority
Low
Designated Use
WWSF - Warmwater Sport Fishery
303(d) ID
2014-62
Listing Date
4/1/2014
Impaired Water Notes
This water was assessed during the 2014 listing cycle; total phosphorus sample data exceed 2014 WisCALM listing criteria for the Fish and Aquatic Life use, however, no biological data (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scores) were available to assess biological impairment).
Date
1/28/2014

Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data exceed 2016 WisCALM listing criteria for the Fish and Aquatic Life use, however, available biological data do not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the "poor" condition category).
Date
10/5/2015

 
Pollutant
Sediment/Total Suspended Solids
Listed For
Fish and Aquatic Life
Impairments
Degraded Habitat
Current Use
WWSF - Warmwater Sport Fishery
Listing Status
TMDL Approved
Attainable Use
WWSF - Warmwater Sport Fishery
Priority
Not Applicable
Designated Use
WWSF - Warmwater Sport Fishery
303(d) ID
36267-330
Listing Date
4/1/1998
Impaired Water Notes
Otter Creek is impaired due to degraded habitat because of excessive sediment loading from surrounding agricultural lands to the Creek. Otter Creek is currently not meeting the applicable narrative water quality standard (WQS) that prohibits objectionable deposits on the shore or in the bed
of a water in amounts that interfere with public rights in the water. Additionally, Otter Creek is not meeting its codified fish uses. To address the degraded habitat impairments, Wisconsin Department of Natural Resources (WDNR) determined that sediment, specifically TSS, is the pollutant that must be addressed to attain designated uses and meet WQS. WDNR used a load duration curve to establish a loading capacity, nonpoint source load allocation and an explicit margin of safety for Otter Creek. There are no point sources located on or discharging to Otter Creek, therefore, a zero wasteload
allocation was established.
Date
10/22/2009

Impaired Water Notes
The sediment TMDL for Otter Creek was approved by the USEPA October 2, 2008.
Date
10/2/2008