Big Eau Pleine Southeast Point Lake

Big Eau Pleine Southeast Point Lake earns an F: phosphorus readings still being added and clarity at 1.5 ft signal heavy nutrient loading from the surrounding watershed.

The hypereutrophic status — TSI 71 — reflects sustained heavy nutrient loading from the surrounding watershed and frequent algal pressure. A maximum depth of 46 ft puts Big Eau Pleine Southeast Point Lake in the middle of Wisconsin's depth distribution. At 6,348 acres, Big Eau Pleine Southeast Point Lake is one of the larger lakes in Marathon County, with partial shoreline records supporting multiple distinct use patterns. Within the 5 graded lakes of Marathon County, Big Eau Pleine Southeast Point Lake sits at rank 5, near the bottom of the county list.

No invasive species are currently listed at Big Eau Pleine Southeast Point Lake — the lake remains off the Wisconsin infested-waters roster. Walleye are documented at Big Eau Pleine Southeast Point Lake, one of 4 fish species on record for the lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.