Porcupine Lake

Porcupine Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Minnesota average. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

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. 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 50 of 53 in Aitkin County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Porcupine Lake — the lake remains off the Minnesota infested-waters roster. The fishery is panfish-dominated — bluegill, crappie, and sunfish among the 6 species documented for the lake. No formal public access is documented at Porcupine Lake — most use is by shoreline residents and their guests. 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.