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a lake.
Contact information
For information on Lakes in Wisconsin, contact:
Wisconsin DNR Lakes
Division of Water
Bureau of Water Quality
DNR Contacts for Lower Nemahbin Lake

Lower Nemahbin Lake Association [exit DNR]

Find A Lake > Waukesha County > Lower Nemahbin Lake

Lower Nemahbin Lake
Waukesha County, 239 Acres

Water Quality

One measure of a lakes health is the trophic state, which relates to the amount of algae in the water. The average summer trophic state for the last 5 years was 41 (Mesotrophic) and was determined using chlorophyll data. For a Deep Lowland lake, this is considered Excellent. Deep Lowland lakes stratify, or form separate layers of water, during the summer months and have watersheds greater than 4 square miles in area.

Lower Nemahbin Lake has been monitored by volunteers since 1988. Volunteers monitor water clarity with a black and white Secchi disk. Some also collect water samples, which are sent to the State Lab of Hygiene to be analyzed. Volunteers are the source of the majority of Wisconsin's lake water quality data, and their dedication is greatly appreciated. Additional monitoring has been done through projects funded in part by DNR Aquatic Invasive Species Grants. Reports and graphs featuring data collected by volunteers, DNR staff and others can be viewed below.

Water Quality Reports and Graphs

Station NameStation IDMapMax YearReports
Lower Nemahbin - Deep Hole North683389Map2000Details
Lower Nemahbin - Deep Hole West683388Map2021Details
Lower Nemahbin Lake - Deep Hole683255Map2021Details
Lower Nemahbin Lake - Deep Hole999129Map1990Details
Lower Nemahbin Lake - Deep Hole - South Basin683133Map2000Details