Superior Lake

Superior Lake earns an A — every scored parameter (clarity and phosphorus) rates among the best monitored waters in Cook County. clarity and phosphorus rate similarly, so there is no obvious single lever to pull on watershed management.

Trophically, Superior Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. 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. Among the 128 graded lakes in Cook County, Superior Lake ranks 27 — in the top quartile locally.

Superior Lake is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. The state fisheries records do not list documented species for Superior Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Superior 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.