Turtle Flambeau Flowage Lake

On the LakeGrade scale Turtle Flambeau Flowage Lake grades a B, with clarity at 6.0 ft and 20 µg/L of phosphorus placing it above the Wisconsin median. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. With 13,798 acres of surface and partial shoreline records, Turtle Flambeau Flowage Lake is a large water by Wisconsin standards — recreational pressure is spread across a long shoreline. Among the 33 graded lakes in Iron County, Turtle Flambeau Flowage Lake sits at rank 14, above the county median.

No invasive species are currently listed at Turtle Flambeau Flowage Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Turtle Flambeau Flowage Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.