Sylvan Lake

Sylvan Lake earns an F: 301 µg/L of phosphorus and clarity at 1.1 ft signal heavy nutrient loading from the surrounding watershed. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Hypereutrophic conditions mean the lake is operating at the upper end of the productivity scale, with all the bloom risk that implies. 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. Sylvan Lake ranks 81 of 95 in Hennepin County — at the lower end of the locally monitored distribution.

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