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

East Lake Tomahawk Association [exit DNR]

Tomahawk Lake Association [exit DNR]

Find A Lake > Oneida County > Tomahawk Lake

Tomahawk Lake
Oneida County, 3462 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 37 (Oligotrophic) and was determined using chlorophyll data. For a Two-Story lake, this is considered Excellent.

Tomahawk Lake has been monitored by volunteers since 1992. 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
Tomahawk Lake - Deep Hole443146Map2018Details
Tomahawk Lake - East Bay443467Map2003Details
Tomahawk Lake - Herbicide Site Echo110052547Map2019Details
Tomahawk Lake - Herbicide Site Echo210052548Map2019Details
Tomahawk Lake - Herbicide Site Echo310052549Map2019Details
Tomahawk Lake - Herbicide Site Echo410052550Map2019Details
Tomahawk Lake - Indian Mounds443468Map2018Details
Tomahawk Lake - Sunflower Bay443466Map2011Details