Unn Lake

Unn Lake grades an F: water clarity, phosphorus, and chlorophyll-a all rate poorly, placing it among the most stressed lakes monitored in Minnesota. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI above 70 puts Unn Lake in hypereutrophic territory: visible blooms are common, and clarity rarely climbs even in early summer. 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. Unn Lake ranks 87 of 95 in Hennepin County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Unn Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Unn Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Unn Lake — most use is by shoreline residents and their guests. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.