Trout Lake Deep

Trout Lake Deep earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Cook County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Mesotrophic conditions dominate at Trout Lake Deep: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. 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, Trout Lake Deep ranks 31 — in the top quartile locally.

No invasive species are currently listed at Trout Lake Deep — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Trout Lake Deep, which usually reflects a lack of formal fisheries survey work rather than an empty lake. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.