Duck Lake

On the LakeGrade scale Duck Lake grades a B, with clarity at 13.1 ft and 29 µg/L of phosphorus placing it above the Wisconsin median. 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.

Mesotrophic conditions dominate at Duck Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. 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. Within the 32 graded lakes of Langlade County, Duck Lake sits at rank 25, near the bottom of the county list.

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.