Fish and Aquatic Life
Green Lake, in the North Branch Milwaukee River Watershed, is a 69.66 acre lake that falls in Washington County. This lake is managed for fishing and swimming and is currently not considered impaired.
Author Aquatic Biologist
This watershed consists of Wallace Creek and four intermittent streams located in the southwestern portion of the watershed.
Wallace Creek presently supports a diverse cold-water forage fishery and at one time received private
stocking of trout. Presently included are many so-called "indicator" species which have the same environmental
requirements and preferences as trout. The presence of these species and the active spring areas along the
watercourse indicate that Wallace Creek, at least those portions downstream of the springs, has the potential to support
trout (FAL-A) and other cold-water species. Stream bank pasturing and connecting ditches are important factors
impacting habitat quality.
Author Surface Water Inventory Of Wisconsin
Source: 1963, Surface Water Resources of Washington County Green lake - T12N, R20E, Sec. 33, Surface Acres 82, S.D.F. = 1.65, Maximum Depth = 35 feet.
A small, elongate, landlocked basin, remnant of a large glacial lake in the area of Lake Michigan terminal moraine. Managed for largemouth bass, panfish, and northern pike, with an abundance of stunted panfish. About 60 acres of woody marshland adjoin the southwest corner of the lake, part of a much larger area of marshy deposits occupying part of the old lake bed. Lowland frontage has restricted cottage development to only 60 per cent of the shore. There are no public access sites however, access for a fee is provided at two sites. This is an important resting and feeding area, especially for diving ducks. Mallards, blue-wing teal, and Florida gallinule have been noted nesting here. Hunting is permitted but the pressure is fairly light.
Author Surface Water Inventory Of Wisconsin
Green Lake (28100) was assessed during the 2016 listing cycle; total phosphorus and chlorophyll sample data were clearly below 2016 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use. This water is meeting these designated uses and is not considered impaired.
Author Ashley Beranek
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.
Phase 3 of Lake Classification Project. Public Hearing and Ordinance revision adoption for the lakes in Washington County. Dissemination of proposed ordinance changes to the other local units of government. Enforcement of revised zoning provisions related to shorelands, wetlands, and floodlands through current channels. Information to public of changes in Washington County codes by meetings, publicity, pamphlets, and brochures.
Through this project Washington County will develop a waterbody classification system; review and revise shoreland-wetland and floodplain ordinances; and refine the ordinance provisions governing shorelands, wetlands and floodlands, incorporating the waterbody classification into them.
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|
|28100||Green Lake||10033725||Green Lake - North Landing at Lakeview Road||4/11/2011||8/2/2022||Map||Data|
|28100||Green Lake||674003||Green Lake - Green Lake||9/6/1979||9/6/1979||Map||Data|
|28100||Green Lake||10051487||Green Lake - [Herbicide Sampling Site GL2]||9/18/2018||6/27/2019||Map||Data|
|28100||Green Lake||10052079||Green Lake - [Herbicide Sampling Site GL4]||6/18/2019||6/27/2019||Map||Data|
|28100||Green Lake||10033726||Green Lake - Lake Haven Landing at Greenway Ct.||5/18/2011||5/18/2011||Map||Data|
|28100||Green Lake||673208||Green Lake - Deep Hole||9/18/1980||10/29/2022||Map||Data|
|28100||Green Lake||10051488||Green Lake - [Herbicide Sampling Site GL3]||9/18/2018||6/27/2019||Map||Data|
|28100||Green Lake||10007137||Green Lake||12/8/1991||3/30/2023||Map||Data|
|28100||Green Lake||10017511||Green Lake -- South Boat Launch||5/1/2010||8/2/2022||Map||Data|
|28100||Green Lake||10051486||Green Lake - [Herbicide Sampling Site GL1]||9/18/2018||6/27/2019||Map||Data|
|28100||Green Lake||10031933||Green Lake -- North Landing||5/1/2010||10/30/2018||Map||Data|
Green Lake is located in the North Branch Milwaukee River watershed which is 149.67 mi². Land use in the watershed is primarily agricultural (45.40%), grassland (20.30%) and a mix of wetland (15.50%) and other uses (18.80%). This watershed has 159.81 stream miles, 886.38 lake acres and 13,793.69 wetland acres.
Nonpoint Source Characteristics
This watershed is ranked High for runoff impacts on streams, High for runoff impacts on lakes and High for runoff impacts on groundwater and therefore has an overall rank of High. 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.