Wapogasset Lake

Wapogasset Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. 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.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. Wapogasset Lake reaches 32 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. With 1,189 acres of surface and partial shoreline records, Wapogasset Lake is a large water by Wisconsin standards — recreational pressure is spread across a long shoreline. Wapogasset Lake sits at rank 51 of 74 in Polk County, in the lower half of the local distribution.

Zebra mussel presence at Wapogasset Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. The fishery includes walleye alongside the lake's other 5 documented species — a notable draw for Wisconsin anglers. A documented public access point at Wapogasset Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.