Duck Lake

The LakeGrade rubric puts Duck Lake at a C: clarity at 3.5 ft, 29 µg/L of phosphorus, and a TSI of 56 signal an intermediate trophic state. Secchi readings are the weakest of the scored parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. Duck Lake reaches 19 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. Duck Lake covers 120 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Among the 32 graded lakes in Langlade County, Duck Lake sits at rank 16, above the county median.

Duck Lake has no invasive species recorded in Wisconsin state databases as of 2025, though prevention practices still apply at all access points. Bass fishing is part of the appeal: the species list runs to 4, anchored by largemouth and/or smallmouth bass. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.