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Lake Keesus

Lake Keesus
Photo by Wisconsin DNR

Contact information
For information on Lakes in Wisconsin, contact:
Wisconsin DNR Lakes
Division of Water
Bureau of Water Quality
DNR Contacts for Lake Keesus

Lake Keesus Advancement Association [exit DNR]

Lake Keesus Management District [exit DNR]

Find A Lake > Waukesha County > Lake Keesus

Lake Keesus
Waukesha County, 235 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 45 (Mesotrophic) and was determined using satellite water clarity observations 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.

Lake Keesus was monitored by volunteers between 1987 and 2013. Volunteers monitor water clarity with a black and white Secchi disk. Volunteers are the source of the majority of Wisconsin's lake water quality data, and their dedication is greatly appreciated. Lake Keesus is also part of DNR's long term trend monitoring project. Additional monitoring has been done through projects funded in part by DNR Lake 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
Keesus Lake - Keesus Lake684002Map1979Details
Lake Keesus - East Basin683321Map2013Details
Lake Keesus - West Basin683124Map2020Details