Cedar Island Lake

Cedar Island Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. 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. Cedar Island Lake sits at rank 106 of 187 in St. Louis County, in the lower half of the local distribution.

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