Frog Lake

Frog Lake grades an F: water clarity, phosphorus, and chlorophyll-a all rate poorly, placing it among the most stressed lakes monitored in Wisconsin. 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.

There is not yet enough seasonal data to settle the lake's trophic classification — the TSI window remains too narrow to call. 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. Within the 70 graded lakes of Burnett County, Frog Lake sits at rank 69, near the bottom of the county list.

No invasive species are currently listed at Frog Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Frog 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.