Porcupine Lake

On the LakeGrade rubric, Porcupine Lake pulls an A: clarity at 23.8 ft and phosphorus readings still being added put it in the top bracket for Wisconsin. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI value of 31 puts Porcupine Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. 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. Porcupine Lake ranks 18 of 66 in Oconto County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Porcupine Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Porcupine Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.