Turtle Flambeau Flowage Lake

Turtle Flambeau Flowage Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Iron County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

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. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Among the 34 graded lakes in Iron County, Turtle Flambeau Flowage Lake sits at rank 11, 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.