Clam Falls Flowage Lake

On the LakeGrade scale Clam Falls Flowage Lake grades a B, with clarity at 14.8 ft and phosphorus readings still being added 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.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Within Polk County's 77 graded lakes, Clam Falls Flowage Lake ranks 54 — below the local median, though not at the bottom.

No invasive species are currently listed at Clam Falls Flowage Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Clam Falls Flowage Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. 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.