Berry Lake

Berry Lake sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI value of 38 puts Berry Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. Berry Lake reaches 27 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 209 acres, Berry Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Among the 66 graded lakes in Oconto County, Berry Lake sits at rank 27, above the county median.

Berry Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. The fishery is bass-led, with 3 documented species across the lake's records. A documented public access point at Berry 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.