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Tomahawk 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 38 (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 Name | Station ID | Map | Max Year | Reports |
|---|
| Tomahawk Lake - Deep Hole | 443146 | Map | 2024 | Details |
| Tomahawk Lake - East Bay | 443467 | Map | 2003 | Details |
| Tomahawk Lake - Herbicide Site Echo1 | 10052547 | Map | 2019 | Details |
| Tomahawk Lake - Herbicide Site Echo2 | 10052548 | Map | 2019 | Details |
| Tomahawk Lake - Herbicide Site Echo3 | 10052549 | Map | 2019 | Details |
| Tomahawk Lake - Herbicide Site Echo4 | 10052550 | Map | 2019 | Details |
| Tomahawk Lake - Indian Mounds | 443468 | Map | 2018 | Details |
| Tomahawk Lake - Sunflower Bay | 443466 | Map | 2011 | Details |
| Tomahawk Lake - T1 | 10057561 | Map | 2023 | Details |
| Tomahawk Lake - T2 | 10057562 | Map | 2023 | Details |
| Tomahawk Lake - T3 | 10057563 | Map | 2023 | Details |