Fish and Aquatic Life
Rock Dam Lake is an impoundment of Hay Creek in Clark County. Flooding in 1993 damaged the dam and drained most of the lake. While the lake was drained, some landowners dredged small areas around their docks. After Clark County repaired the dam, bass and northern pike were stocked by WDNR fisheries staff. Due to the scarcity of lakes in thls region, this impoundment is an important recreational resource to the area. A lake management organization for Rock Dam Lake could be instrumental in obtaining a lake planning grant. WDNR has no data on current water quality; a self-help volunteer could be instrumental in obtaining data.
Author Aquatic Biologist
Source: 1965, Surface Water Resources of Clark County Hay Creek Lake (Rock Dam Lake) T26N, R4W, S15
This is a soft water, drainage impoundment located on Hay Creek. The dam has a 12-foot head and it is owned by Clark County. It was constructed in 1938 by the W.P.A. for the purpose of creating a recreational area. The light brown colored water is slightly acid and has a low transparency. Largemouth bass, bluegill, black crappie, rock bass, perch, bullhead, and white sucker comprise the fishery. There are two county-owned park areas, including a swimming beach and a boat launching site. Around the flowage, there are 76 dwellings. Aquatic vegetation poses a problem to anglers and boaters during the summer months. During the migratory seasons, ducks may be found.
Surface Acres = 105, S.D.F. = 2.76, Known Maximum Depth = 16 feet
Author Surface Water Inventory Of Wisconsin
Rock Dam Lake (WBIC 2139000) was placed on the impaired waters list for Mercury in 1998 and for total phosphorus in 2014. The 2018 assessments showed continued impairment by phosphorus; new total phosphorus sample data exceeded the 2018 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use. Chlorophyll-a sample data did not exceed the REC or FAL thresholds. Based on the most updated information, no change in the existing impaired waters listing was needed.
Author Ashley Beranek
Rock Dam Lake (2139000) was placed on the impaired waters list for Mercury in 1998 and for total phosphorus in 2014. The 2016 assessments showed continued impairment by phosphorus; total phosphorus sample data exceeded 2016 WisCALM listing thresholds for the Recreation, however, chlorophyll data do not exceed REC thresholds. Total phosphorus and chlorophyll data clearly met thresholds for Fish and Aquatic Life use. Based on the most updated information, no change in existing impaired waters listing is needed.
Author Aaron Larson
Wisconsin has over 84,000 miles of streams, 15,000 lakes and milllions of acres of wetlands. Assessing the condition of this vast amount of water is challenging. The state's water monitoring program uses a media-based, cross-program approach to analyze water condition. An updated monitoring strategy (2015-2020) is now available. Compliance with Clean Water Act fishable, swimmable standards are located in the Executive Summary of Water Condition in 2018. See also the 'monitoring and projects' tab.
Wisconsin's Water Quality Standards provide qualitative and quantitative goals for waters that are protective of Fishable, Swimmable conditions [Learn more]. Waters that do not meet water quality standards are considered impaired and restoration actions are planned and carried out until the water is once again fishable and swimmable
Management goals can include creation or implementation of a Total Maximum Daily Load analysis, a Nine Key Element Plan, or other restoration work, education and outreach and more. If specific recommendations exist for this water, they will be displayed below online.
Monitoring the condition of a river, stream, or lake includes gathering physical, chemical, biological, and habitat data. Comprehensive studies often gather all these parameters in great detail, while lighter assessment events will involve sampling physical, chemical and biological data such as macroinvertebrates. Aquatic macroinvertebrates and fish communities integrate watershed or catchment condition, providing great insight into overall ecosystem health. Chemical and habitat parameters tell researchers more about human induced problems including contaminated runoff, point source dischargers, or habitat issues that foster or limit the potential of aquatic communities to thrive in a given area. Wisconsin's Water Monitoring Strategy was recenty updated.
Grants and Management Projects
|WBIC||Official Waterbody Name||Station ID||Station Name||Earliest Fieldwork Date||Latest Fieldwork Date||View Station||View Data|
|2139000||Rock Dam Lake||10015122||Rock Dam Lake Fyke Nets (1/2-1)||Map||Data|
|2139000||Rock Dam Lake||10018578||Rock Dam Lake -- Access||5/26/2012||6/16/2014||Map||Data|
|2139000||Rock Dam Lake||10015098||Rock Dam Lake Mini Fyke Nets||Map||Data|
|2139000||Rock Dam Lake||103132||Rock Dam Lake - Deepest Point||5/1/1995||10/15/2017||Map||Data|
|2139000||Rock Dam Lake||10022246||Rock Dam Lake||10/1/1991||8/19/2017||Map||Data|
|2139000||Rock Dam Lake||10015095||Rock Dam Baseline Monitoring 2004||Map||Data|
Rock Dam Lake is located in the South Fork Eau Claire River watershed which is 229.49 mi². Land use in the watershed is primarily forest (56%), agricultural (22.80%) and a mix of wetland (12%) and other uses (9.20%). This watershed has 421.59 stream miles, 307.67 lake acres and 23,719.61 wetland acres.
Nonpoint Source Characteristics
This watershed is ranked Low for runoff impacts on streams, High for runoff impacts on lakes and Medium for runoff impacts on groundwater and therefore has an overall rank of Medium. This value can be used in ranking the watershed or individual waterbodies for grant funding under state and county programs.However, all waters are affected by diffuse pollutant sources regardless of initial water quality. Applications for specific runoff projects under state or county grant programs may be pursued. For more information, go to surface water program grants.