Meder Lake

Meder Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Wisconsin average.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. At only 10 ft deep, Meder Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. Meder Lake covers 135 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Meder Lake ranks 10 of 10 in Ashland County — at the lower end of the locally monitored distribution.

Meder Lake has at least one documented invasive species (Purple Loosestrife), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. Walleye are documented at Meder Lake, one of 4 fish species on record for the lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.