Rhinelander Flowage Lake

Rhinelander Flowage Lake comes in at a B on the grading rubric — a respectable showing for a Wisconsin lake of its size and depth. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI near 40 places Rhinelander Flowage Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Rhinelander Flowage Lake is a shallow lake at 10 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. With 1,372 acres of surface and partial shoreline records, Rhinelander Flowage Lake is a large water by Wisconsin standards — recreational pressure is spread across a long shoreline. Within the 140 graded lakes of Oneida County, Rhinelander Flowage Lake sits at rank 115, near the bottom of the county list.

Rhinelander Flowage 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. Walleye are documented at Rhinelander Flowage Lake, one of 6 fish species on record for the lake. A documented public access point at Rhinelander Flowage 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.