Ahmakose Lake

On the LakeGrade rubric, Ahmakose Lake pulls an A: clarity at 18.5 ft and phosphorus readings still being added put it in the top bracket for Minnesota.

A TSI value of 35 puts Ahmakose Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. Ahmakose Lake is unusually deep for Minnesota at 68 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. The lake is compact at 43 acres, with 1.4 miles of shoreline and little volume to buffer nutrient inputs. Among the 142 graded lakes in Lake County, Ahmakose Lake ranks 14 — in the top quartile locally.

Ahmakose Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Ahmakose Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.