Aquatic Plant Management Plan for Lower Nemahbin Lake

Lower Nemahbin Lake is a 239-acre drainage lake located within the Village of Summit. The Bark River is the Lake’s main tributary and outflow. The Lake is immediately downstream of Upper Nemahbin Lake, with which it shares a public boat landing, and about one mile upstream of Crooked Lake. The Bark River, which flows into the Lake from Upper Nemahbin Lake, is the Lake’s largest tributary and its outlet. The Lower Nemahbin Lake Association conducts lake management activities on the Lake, including aquatic plant management. The invasive macroalga starry stonewort (Nitellopsis obtusa) was observed in the Lake in 2019, prompting the Association to contract for diver-assisted suction harvesting and hand-pulling to mitigate this population. A Wisconsin Department of Natural Resources grant provided short-term funding towards starry stonewort monitoring and removal efforts. As this grant funding expires, the Association seeks to develop an aquatic plant management plan to continue their aquatic plant monitoring and management efforts over the coming years. 

In May 2023, the Association and Southeastern Wisconsin Regional Planning Commission executed an agreement that the Commission would prepare an aquatic plant management plan for Lower Nemahbin Lake. This plan summarizes recent aquatic plant surveys of the Lake, evaluates ongoing efforts to manage starry stonewort and Eurasian watermilfoil (Myriophyllum spicatum), and provides recommendation for long-term aquatic plant management including monitoring strategies, treatment techniques, and potential grant funding. 

The plan can be found at the following link



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Southeastern Wisconsin Regional Planning Commission

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Waukesha, WI 53187-1607

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Global Water Center
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