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.

Trophically, Dumbbell Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. A maximum depth of 40 ft puts Dumbbell Lake in the middle of Minnesota's depth distribution. The lake's 406 acres and 8.9 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Among the 142 graded lakes in Lake County, Dumbbell Lake ranks 10 — in the top quartile locally.

No invasive species are currently listed at Dumbbell Lake — the lake remains off the Minnesota infested-waters roster. 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. Ice-out has been recorded 6 times at Dumbbell Lake, with a median around May 1. 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.