Bad Medicine Lake

On the LakeGrade rubric, Bad Medicine Lake pulls an A: clarity at 25.0 ft and 6 µg/L of phosphorus put it in the top bracket for Minnesota. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Trophically, Bad Medicine Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. The lake's 84 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. Bad Medicine Lake covers 803 acres alongside 12.8 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Becker County's 93 graded waters, Bad Medicine Lake sits at rank 1, near the top of the local distribution.

Bad Medicine Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. Walleye are documented at Bad Medicine Lake, one of 13 fish species on record for the lake. Public access is available — the lake is on the Minnesota PCA public-access list. The lake has a long ice-out record — 52 observations on file, with a median ice-out around Apr 22. 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.