Flowage Lake

The LakeGrade rubric puts Flowage Lake at a C: clarity at 8.5 ft, phosphorus readings still being added, and a TSI of 46 signal an intermediate trophic state.

A TSI near 46 places Flowage Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake bottoms out at 15 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 112 acres, Flowage Lake fits the Minnesota median for monitored lakes, with 3.1 miles of shoreline. Flowage Lake sits at rank 103 of 187 in St. Louis County, in the lower half of the local distribution.

No invasive species are currently listed at Flowage Lake — the lake remains off the Minnesota infested-waters roster. The fishery is bass-led, with 7 documented species across the lake's records. No formal public access is documented at Flowage Lake — most use is by shoreline residents and their guests. Ice-out has been logged at Flowage Lake more than two dozen times, putting the median around Apr 22 — a useful baseline for tracking climate trends. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.