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DNR Contacts for Mann Lake

Find A Lake > Vilas County > Mann Lake

Mann Lake


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 57 (Eutrophic) and was determined using chlorophyll data. For a Shallow Headwater lake, this is considered Good. Shallow lakes are those that do not stratify during the summer months, so the water near the surface may be impacted by resuspension of sediments. If a lake's watershed is less than 4 square miles, the lake is classified as a Headwater Lake.

Mann Lake has been monitored by volunteers since 1995. 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 Lake Grants and 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
Mann Lake - 200 Foot10047983Map2017Details
Mann Lake - Deep Hole643460Map2024Details
Mann Lake - Deep Hole (Richard Jenks)10047978Map2017Details
Mann Lake - East Site10047981Map2017Details
Mann Lake - Hetzel Pier10047985Map2017Details
Mann Lake - Mid Site10047980Map2017Details
Mann Lake - Transect Line10047982Map2017Details
Mann Lake - Walschinski Pier10047984Map2017Details
Mann Lake - West Site10047979Map2017Details