Fish and Aquatic Life
Rock River Water Quality Management Plan, Lower Rock River Appendix. WT-668-2002. South Central Region, WDNR.
Lower Nashotah Lake is a Class IA lake and supports excellent water quality and low density housing along its shoreline. It's a marl lake that is part of the Bark River chain of lakes assessed by SEWRPC in 1993. Dredging permit requests have been submitted for work in the lake's lower bay south navigational channel. The lake may be affected by wind erosion and deposition of solids from the Pabst agricultural land-spreading site nearby. The lake is not sewered.
Author Aquatic Biologist
Source: 1963, Surface Water Resources of Waukesha County Lower Nashotah Lake T7N, R17E, Sections 12 and 13
A small elongate basin bordering outwash and terminal moraine. A seasonal inlet flows from Upper Nashotah Lake and an unimpounded outlet, easily traversable by boat, connects to Upper Nemahbin Lake. The water is clear and the bottom is primarily gravel and marl. Largemouth bass, pan fish, walleyes and rainbow trout constitute the fishery. In addition to access by water, access without parking is available at the north end of the lake from a county trunk highway. There are no adjoining wetlands.
Surface Acres = 90, S.D.F. 1.50, Maximum Depth = 43 feet
Author Surface Water Inventory Of Wisconsin
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|
|827300||Lower Nashotah Lake||10056699||Joseph Property - Private on Lower Nashotah||7/5/2021||7/5/2021||Map||Data|
|827300||Lower Nashotah Lake||683454||Lower Nashotah Lake -- Boat Landing Next To Pabst Rd.||6/30/2017||6/30/2017||Map||Data|
|827300||Lower Nashotah Lake||683257||Lower Nashotah Lake - Deep Hole||8/19/2020||8/19/2020||Map||Data|
|827300||Lower Nashotah Lake||683130||Lower Nashotah Lake - Deep Hole||11/19/1973||9/13/2022||Map||Data|
|827300||Lower Nashotah Lake||10007171||Lower Nashotah Lake||4/10/1993||8/27/2022||Map||Data|
Lower Nashotah Lake is located in the Bark River watershed which is 185.84 mi². Land use in the watershed is primarily agricultural (29.90%), wetland (22.40%) and a mix of forest (15.20%) and other uses (32.50%). This watershed has 265.69 stream miles, 3,499.26 lake acres and 22,145.94 wetland acres.
Nonpoint Source Characteristics
This watershed is ranked Medium 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.