Unn Lake

Unn Lake grades an F: every scored parameter (clarity and phosphorus) rates poorly, placing it among the most stressed lakes monitored in Minnesota. clarity and phosphorus 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 86 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.