Minong Flowage Lake

The LakeGrade rubric puts Minong Flowage Lake at a C: clarity at 3.5 ft, 37 µg/L of phosphorus, and a TSI of 58 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.

At a TSI of 58, Minong Flowage Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. Minong Flowage Lake reaches 21 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. Minong Flowage Lake covers 1,587 acres alongside partial shoreline records, large enough that conditions can vary meaningfully between bays. Within the 47 graded lakes of Washburn County, Minong Flowage Lake sits at rank 44, near the bottom of the county list.

Minong Flowage Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. Walleye are documented at Minong Flowage Lake, one of 5 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. 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.