Impaired Water - Searles Creek (Searles Creek)
Green County, Wisconsin
SP12
879500
0.00 - 10.33
10.33
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
On 2006 303d list, TMDL approved 2005.
This nine-mile, low gradient stream flows eastward and joins the Sugar River at the north end of Decatur Lake. The
creek's watershed is a broad, flat-bottomed basin, which is heavily tilled for crops. A great deal of the stream has been
straightened because of ditching. Trees and vegetation along the shore buffer some areas, while other areas are grazed
right down to the shoreline. A wetland area just upstream from the confluence with Decatur Lake provides habitat for
wildlife. The existing use as a warm water sport fishery is mainly due to fish species migrating upstream from Decatur
Lake seeking better habitat than which can be found in the lake itself. As part of a structured habitat survey in 2002,
WDNR aquatic biologists observed that the stream bottom had extensive (greater than 60% silt and clay) fines in
riffles and runs. According to the WDNR habitat ratings, this is considered poor habitat. A 2002 fish assessment at
CTH F showed a variety of warm water forage species dominated by bluntnose minnow. The results from a 2002
macroinvertebrate assessment describes this stream as "good" water quality with some organic pollution (HBI =
5.089). Searles Creek is listed on the state's list of impaired (303d) waters because of habitat degradation caused by
primarily sedimentation.


This water was assessed during the 2018 listing cycle; new total phosphorus sample data may meet 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) scored in the "poor" condition category).
Reports and Documents
WDNR WES, Tmdl Swat Team
Water Evaluation Section
USEPA
Listing Details
Pollutant
Sediment/Total Suspended Solids
Listed For
Fish and Aquatic Life
Impairments
Degraded Habitat
Current Use
WWFF - Warmwater Forage Fishery
Listing Status
TMDL Approved
Attainable Use
WWSF - Warmwater Sport Fishery
Priority
Not Applicable
Designated Use
WWSF - Warmwater Sport Fishery
303(d) ID
421
Listing Date
4/1/1998
Impaired Water Notes
This nine-mile, low gradient stream flows eastward and joins the Sugar River at the north end of Decatur Lake. The creek's watershed is a broad, flat-bottomed basin, which is heavily tilled for crops. A great deal of the stream has been straightened because of ditching. Trees and vegetation along the shore buffer some areas, while other areas are grazed right down to the shoreline. A wetland area just upstream from the confluence with Decatur Lake provides habitat for wildlife. The existing use as a warm water sport fishery is mainly due to fish species migrating upstream from Decatur Lake seeking better habitat than which can be found in the lake itself. As part of a structured habitat survey in 2002, WDNR aquatic biologists observed that the stream bottom had extensive (greater than 60% silt and clay) fines in riffles and runs. According to the WDNR habitat ratings, this is considered poor habitat. A 2002 fish assessment at CTH F showed a variety of warm water forage species dominated by bluntnose minnow. The results from a 2002 macroinvertebrate assessment describes this stream as "good" water quality with some organic pollution (HBI = 5.089). Searles Creek is listed on the state's list of impaired (303d) waters because of habitat degradation caused by primarily sedimentation.
Date
6/28/2005

Impaired Water Notes
Searles Creek (879500, miles 0-10.33) is part of the Sugar-Pecatonica River Basin and the sediment TMDLs were approved by the USEPA August 24, 2005.
Date
4/25/2005