Dumbbell Lake

On the LakeGrade rubric, Dumbbell Lake pulls an A: clarity at 15.8 ft and phosphorus readings still being added 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.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. A maximum depth of 40 ft puts Dumbbell Lake in the middle of Minnesota's depth distribution. Dumbbell Lake covers 406 acres alongside 8.9 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Dumbbell Lake ranks 10 of 142 in Lake County, putting it in the upper tier of locally monitored lakes.

Dumbbell Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. Dumbbell Lake's fishery is anchored by muskellunge, with 6 documented species in total — a destination water for muskie anglers. Public access is available — the lake is on the Minnesota PCA public-access list. The lake has a partial ice record — 6 observed ice-outs, centered near May 1. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.