Dead Lake

Dead Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. The lake's 65 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. With 7,546 acres of surface and 41.0 miles of shoreline, Dead Lake is a large water by Minnesota standards — recreational pressure is spread across a long shoreline. Dead Lake sits at rank 67 of 97 in Otter Tail County, in the lower half of the local distribution.

Zebra mussels have been documented at Dead Lake, which alters the filter-feeding balance and can paradoxically increase water clarity while disrupting the food web. Walleye are documented at Dead Lake, one of 18 fish species on record for the lake. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been recorded 6 times at Dead Lake, with a median around Apr 14. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.