Poskin Lake

The LakeGrade rubric puts Poskin Lake at a C: clarity at 4.0 ft, 29 µg/L of phosphorus, and a TSI of 55 signal an intermediate trophic state. Secchi readings are the weakest of the scored parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

At a TSI of 55, Poskin Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. Poskin Lake reaches 30 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 154 acres, Poskin Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Poskin Lake sits at rank 20 of 37 in Barron County, in the lower half of the local distribution.

Poskin Lake has at least one documented invasive species (Chinese Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. The fishery includes walleye among the lake's 4 documented species — a notable draw for Wisconsin anglers. 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.