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

Mercer Lake Association [exit DNR]

Find A Lake > Iron County > Mercer Lake

Mercer Lake
Iron County, 181 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 42 (Mesotrophic) and was determined using chlorophyll data. For a Shallow Lowland lake, this is considered Excellent. Shallow Lowland lakes do not stratify, or form separate layers of water, during the summer months and have watersheds greater than 4 square miles in area.

Mercer Lake has been monitored by volunteers since 2001. 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. 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
Mercer Lake - Deep Hole263126Map2019Details
Mercer Lake - Home Base263177Map2016Details
Mercer Lake West Basin Deep Hole10022388Map2009Details
Mercer Lake at Max Point Of Depth263129Map2009Details
Mercer Lake in Outlet Bay at Mercer WI10037900Map2008Details