Stillwell and Squaw Creeks TMDL
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Purpose

This is a U.S. EPA initiated and approved TMDL.Squaw Creek and Stillwell Creek are tributary streams of the Upper La Crosse River Basin, located inMonroe County in west-central Wisconsin. The streams are within the boundaries of Fort McCoy, a federal military facility. Both Squaw Creek and Stillwell Creek are classified as “water quality-limited” and have been placed on Wisconsin’s list of water bodies in need of restoration, a list prepared in accordance with Section 303(d) of the Clean Water Act and known as the “303(d) list.” The Wisconsin Department of Natural Resources (WDNR) listed Squaw Creek due to temperatureimpairments. WDNR listed Stillwell Creek due to temperature and sediment impairments. StillwellCreek was added to the 303(d) list in 2003, but there was an error in listing the precise segment of thecreek. The State of Wisconsin has since provided information to USEPA to correct this information.

Objective

Stillwell Creek is a 4.7-mile trout stream with a gradient of 28 feet per mile that drains an area ofapproximately five square miles. A 2.2-mile segment downstream from the cranberry operation supportsa class III trout fishery whereas the segment upstream of the cranberry operation is classified as a class IItrout fishery. The segment of the creek downstream of the cranberry operation is considered impairedbecause the fish community is rated poor as measured using the Index of Biotic Integrity (IBI). The lowIBI scores are believed to be due to high temperatures, and degraded habitat which is reflected in anelevated fine sediment count.Water temperature increases cause cold water communities to suffer a variety of ill effects, which canrange from decreased spawning to death. Dissolved oxygen sags can also be influenced by an increase inthe water temperature because less oxygen is soluble as temperature increases. Water temperatureincreases can be caused as a result of stream bank erosion, widening the river channels, which exposesmore of the river water to direct sunlight.Sedimentation reduces the suitable habitat for fish and macroinvertebrate communities. Filling-in ofpools with sediment reduces the amount of available cover for juvenile and adult fish. Sedimentation ofriffle areas reduces the reproductive success of fish by reducing the exposed gravel substrate necessaryfor appropriate spawning conditions. Sedimentation also affects macroinvertebrate biomass (fish food source) which tends to be lower in areas with predominantly sand substrate than in a stream substrate with a mix of gravel, rubble and sand.Sedimentation (particularly in the case of fine sediments which remain in suspension longer) also causeselevated turbidity, which reduces the penetration of light necessary for photosynthesis in aquatic plants,reduces feeding efficiency of visual predators and filter feeders, and lowers the respiratory capacity ofaquatic invertebrate by clogging their gill surfaces.In addition, other contaminants such as nutrients (phosphorus) attached to sediment particles can betransported to lakes and streams during runoff events. Nutrient enrichment can contribute to dissolved oxygen sags by stimulating aquatic plant growth and their oxygen consumption demands.

Related Reports

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TMDL/303d Projects
Approved TMDL
Stillwell Creek TMDL
2006
Active
 
Reports and Documents
US EPA Squaw and Stillwell Creeks (1662600 1665800) TMDL Decision Document
Squaw and Stillwell Creeks (1662600 1665800) TMDL Decision Document. This pdf is not an actual EPA decision document as this is an EPA initiated and approved TMDL; they do not “review” their own TMDLs, so a decision document was not issued.
Stillwell Creek Land Use Map
Stillwell Creek Land Use Map
Stillwell Creek Pond and Cranberry Ponds
Stillwell Pond Cranberry Beds, Ft. McCoy
STILLWELL CREEK 303D LISTING DOCUMENTATION
Squaw and Stillwell Creeks (1662600 1665800) TMDLs
Stillwell Creek 1662600 Impaired Waters Listing Documentation 2006
Data Documentation Impaired Waters Documentation, Changes
STILLWELL CREEK 2008 TROUT BOOK DATA
Trout Stream Classification Checklist, survey on file at Fort McCoy.
 
Activities & Recommendations
TMDL (USEPA) Approved
EPA initiated and approved TMDL for Squaw Creek and Stillwell Creek, Monroe County, WI. The Wisconsin Department of Natural Resources (WDNR) listed Squaw Creek due to temperature impairments. WDNR listed Stillwell Creek due to temperature and sediment impairments.
TMDL (USEPA) Approved
This is a U.S. EPA initiated and approved TMDL. Squaw Creek and Stillwell Creek are tributary streams of the Upper La Crosse River Basin, located in Monroe County in west-central Wisconsin. The streams are within the boundaries of Fort McCoy, a federal military facility. Both Squaw Creek and Stillwell Creek are classified as ?water quality-limited? and have been placed on Wisconsin?s list of water bodies in need of restoration, a list prepared in accordance with Section 303(d) of the Clean Water Act and known as the ?303(d) list.? The Wisconsin Department of Natural Resources (WDNR) listed Squaw Creek due to temperature impairments. WDNR listed Stillwell Creek due to temperature and sediment impairments. Stillwell Creek was added to the 303(d) list in 2003, but there was an error in listing the precise segment of the creek. The State of Wisconsin has since provided information to USEPA to correct this information.
TMDL Development
TMDL Development for Squaw Creek and Stillwell Creek, Monroe County, WI. Stillwell Creek is a 4.7-mile trout stream with a gradient of 28 feet per mile that drains an area of approximately five square miles. A 2.2-mile segment downstream from the cranberry operation supports a class III trout fishery whereas the segment upstream of the cranberry operation is classified as a class II trout fishery. The segment of the creek downstream of the cranberry operation is considered impaired because the fish community is rated poor as measured using the Index of Biotic Integrity (IBI). The low IBI scores are believed to be due to high temperatures, and degraded habitat which is reflected in an elevated fine sediment count.
 
Watershed
Upper La Crosse River
 
Waters
Stillwell Creek
Monitoring Data