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Find A Lake > Walworth County > Delavan Lake

Delavan Lake
Walworth County, 1906 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 54 (Eutrophic) and was determined using chlorophyll data. For a Deep Lowland lake, this is considered Good. Deep Lowland lakes stratify, or form separate layers of water, during the summer months and have watersheds greater than 4 square miles in area.

Delavan Lake has been monitored by volunteers since 1986. 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
Delavan Lake - Deep Hole653215Map2017Details
Delavan Lake - NE End of Lake (Lake Lawn /Assembly Park)10031264Map2017Details
Delavan Lake - Near Shore Drive (Rain Event #1)10031265Map2010Details
Delavan Lake - SW End of Lake (S.S. Manor / Borg Mansion and Island House)10031263Map2017Details
Delavan Lake at North End10041431Map2017Details