Spearhead Lake

Spearhead Lake sits at the top of the Minnesota PCA grading rubric with an A, a mark reached by the cleanest lakes in Minnesota. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Trophically, Spearhead Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. The lake's 81 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. The lake's 194 acres and 3.9 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Within Hubbard County's 77 graded waters, Spearhead Lake sits at rank 3, near the top of the local distribution.

No invasive species are currently listed at Spearhead Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Spearhead Lake, one of 17 fish species on record for the lake. No formal public access is documented at Spearhead Lake — most use is by shoreline residents and their guests. 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.