Alimagnet Lake

Alimagnet Lake earns a D — measurements through 2025 show persistent nutrient pressure that limits clarity through the summer. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

At a TSI of 63, Alimagnet Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of just 12 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. At 104 acres, Alimagnet Lake fits the Minnesota median for monitored lakes, with 3.4 miles of shoreline. Alimagnet Lake sits at rank 34 of 48 in Dakota County, in the lower half of the local distribution.

Alimagnet 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 Alimagnet Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Alimagnet Lake — most use is by shoreline residents and their guests. The lake has a long ice-out record — 35 observations on file, with a median ice-out around Apr 5. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.