Stone Lake

The LakeGrade rubric puts Stone Lake at a C: clarity readings still being added, 31 µg/L of phosphorus, and a TSI of 53 signal an intermediate trophic state.

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. Within St. Louis County's 187 graded lakes, Stone Lake ranks 129 — below the local median, though not at the bottom.

Stone Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Stone Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Stone 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.