Fish and Aquatic Life
Hancock Lake, in the Lower Tomahawk River Watershed, is a 258.63 acre lake that falls in Oneida County. This lake is managed for fishing and swimming and is currently considered impaired.
Author Aquatic Biologist
Source: 1966, Surface Water Resources of Oneida County Hancock Lake, T36N, R7E, Section 9 Surface Acres = 258.5, S.D.F. = 3.13, Maximum Depth = 22 feet.
A soft water drainage lake having slightly acid light brown water of moderate transparency. Muck (50 percent) and sand (30 percent) are the principal littoral materials with gravel, rubble and boulders present. The shoreline is mostly upland (65 percent) with a significant portion wetland of the bog-shrub type. Floatingvegetation is dense in certain areas of this lake. Emergent and submergent vegetation is moderate in density. Fish species found in this lake are muskellunge, northern pike, walleye, largemouth bass, perch, bluegill, crappie, pumpkinseed, bullhead and suckers. The lake is considered to have a weed and algae problem. Public access with parking is available. Three resorts and 17 dwellings are located on the shoreline. Black duck use this lake as a nesting site. Puddle ducks and diving ducks make use of this lake on their fall migration. Water levels are maintained by a dam on the outlet stream with a six foot head.
Author Surface Water Inventory Of Wisconsin
Hancock Lake (WBIC 1517900) was placed on the impaired waters list for excess algal growth in 2014. The 2018 assessments showed continued excess algal growth; new chlorophyll-a sample data exceeded the 2018 WisCALM listing thresholds for the Recreation use. Total phosphorus data were clearly below the Recreation use and Fish and Aquatic Life use listing thresholds. Based on the most updated information, no change in the existing impaired waters listing was needed.
Author Ashley Beranek
Hancock Lake (1517900) was placed on the impaired waters list for excess algal growth in 2014. The 2016 assessments showed continued excess algal growth; chlorophyll sample data exceed 2016 WisCALM listing thresholds for the Recreation use, however, total phosphorus were clearly below REC thresholds. Total phosphorus and chlorophyll data were clearly below Fish and Aquatic Life listing thresholds. 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|
|1517900||Hancock Lake||443107||Hancock Lake - Deep Hole||7/16/1979||8/31/2021||Map||Data|
|1517900||Hancock Lake||10004270||Hancock Lake||7/27/1999||4/5/2021||Map||Data|
|1517900||Hancock Lake||10040783||Hancock Lake - Staff Gauge on Dam||5/14/2013||8/25/2021||Map||Data|
|1517900||Hancock Lake||10018911||Hancock Lake -- Access||9/17/2005||9/5/2021||Map||Data|
|1517900||Hancock Lake||10037748||Hancock Lake - island beach||7/3/2012||7/3/2012||Map||Data|
|1518000||Rice Creek||10040783||Hancock Lake - Staff Gauge on Dam||5/14/2013||8/25/2021||Map||Data|
Hancock Lake is located in the Lower Tomahawk River watershed which is 133.87 mi². Land use in the watershed is primarily forest (58.70%), wetland (29.50%) and a mix of open (7.50%) and other uses (4.20%). This watershed has 107.64 stream miles, 5,219.67 lake acres and 23,295.39 wetland acres.
Nonpoint Source Characteristics
This watershed is ranked Low for runoff impacts on streams, Low for runoff impacts on lakes and Low for runoff impacts on groundwater and therefore has an overall rank of Low. 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.