Middle Sucker Lake

The LakeGrade rubric puts Middle Sucker Lake at a C: clarity at 4.8 ft, 32 µg/L of phosphorus, and a TSI of 54 signal an intermediate trophic state. 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.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. Middle Sucker Lake reaches 20 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. Middle Sucker Lake covers 286 acres alongside 3.2 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within the 133 graded lakes of Cass County, Middle Sucker Lake sits at rank 130, near the bottom of the county list.

No invasive species are currently listed at Middle Sucker Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Middle Sucker Lake, one of 12 fish species on record for the lake. The lake lacks a documented public access point, so visitor use is limited. 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.