Marshan Lake

On the LakeGrade rubric Marshan Lake fails the cutoffs — a TSI of 74 and persistent algal pressure put it in the bottom tier.

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. Marshan Lake ranks 24 of 24 in Anoka County — at the lower end of the locally monitored distribution.

Marshan Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. The state fisheries records do not list documented species for Marshan Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Marshan 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.