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 Name	Station ID	Map	Max Year	Reports
Mann Lake - 200 Foot	10047983	Map	2017	Details
Mann Lake - Deep Hole	643460	Map	2024	Details
Mann Lake - Deep Hole (Richard Jenks)	10047978	Map	2017	Details
Mann Lake - East Site	10047981	Map	2017	Details
Mann Lake - Hetzel Pier	10047985	Map	2017	Details
Mann Lake - Mid Site	10047980	Map	2017	Details
Mann Lake - Transect Line	10047982	Map	2017	Details
Mann Lake - Walschinski Pier	10047984	Map	2017	Details
Mann Lake - West Site	10047979	Map	2017	Details