Impaired Water - Halfmoon Lake (Half Moon Lake)
Eau Claire County, Wisconsin
LC13
2125400
135.14
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Halfmoon Lake was 303(d) listed for Total Phosphorus and Eutrophication in 1998, and a TMDL was approved in 2004.

The lake is highly eutrophic and exhibits excessive algae and aquatic macrophyte growth (Borman, 1990; Brakke, 1995; Konkel and Borman, 1996; James et. al., 2001, 2002).

TP and/or chlorophyll data from the period 2006-2010 were insufficient to assess per 2012 WisCALM. However, the previous assessment(s) were carried forward, and the lake remains listed as impaired.
Listing Details
Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
Eutrophication
Current Use
Shallow Seepage Lake
Listing Status
TMDL Approved
Attainable Use
WWSF - Warmwater Sport Fishery
Priority
Not Applicable
Designated Use
WWSF - Warmwater Sport Fishery
303(d) ID
10855-176
Listing Date
4/1/1998
Impaired Water Notes
Half Moon Lake (Hydrologic Unit Code 070500006) is a small, shallow eutrophic lake that formed as an oxbow of the Chippewa River. The lake is geographically located within the City of Eau Claire and the Lower Chippewa River Basin. The lake is highly eutrophic and exhibits excessive algae and aquatic macrophyte growth (Borman, 1990; Brakke, 1995; Konkel and Borman, 1996; James et. al., 2001, 2002). Half Moon Lake was originally listed on Wisconsin’s 303(d) impaired waters list in 1998 for eutrophic conditions and sedimentation and listed as a high priority for TMDL development on the October 2002 303(d) list.

Half Moon Lake is 53 hectares (132 acres) in size with a maximum depth of about 3 meters (slightly over 9 feet). The lake’s watershed is 577 acres and approximately 85% of the shoreline is publicly owned by the City of Eau Claire. Land use in the watershed is 45% residential, 41% open land and 14% commercial (Barr Engineering, 1992). The City has a policy of purchasing properties abutting the lake when they become available and at the present time, only four privately owned properties remain along the shoreline.
Date
6/22/2004

Impaired Water Notes
TP and/or chlorophyll data from the period 2006-2010 were insufficient to assess per 2012 WisCALM. However, the previous assessment(s) were carried forward, and the lake remains listed as impaired.
Date
6/13/2011

Impaired Water Notes
The phosphorus TMDL for Halfmoon Lake was approved by the USEPA September 8, 2004.
Date
9/8/2004