Big Eau Pleine Southeast Point Lake

Big Eau Pleine Southeast Point Lake earns a D — measurements through 2023 show persistent nutrient pressure that limits clarity through the summer. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. 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 4, 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. The fishery includes walleye alongside the lake's other 4 documented species — a notable draw for Wisconsin anglers. A documented public access point at Big Eau Pleine Southeast Point Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.