Alder 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 43 (Mesotrophic) and was determined using Secchi 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.

Alder Lake has been monitored by volunteers since 1990. 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. 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
Alder Lake - Cran Study Alder Lake Center	643003	Map	1977	Details
Alder Lake - Deep Hole	643219	Map	2025	Details
Alder Lake West Outlet	643004	Map	1977	Details
Study Alder Lake - Cran Study Alder Lake East Inlet	643002	Map	1976	Details