Minong Flowage Lake

On the LakeGrade scale Minong Flowage Lake grades a B, with clarity at 12.3 ft and 37 µg/L of phosphorus placing it above the Wisconsin median. 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 near 49 places Minong Flowage Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. 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 48 graded lakes of Washburn County, Minong Flowage Lake sits at rank 47, 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.