Wassermann Main Lake

Wassermann Main 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, Wassermann Main Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. The lake bottoms out at 41 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Wassermann Main Lake covers 170 acres alongside 2.6 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Wassermann Main Lake sits at rank 25 of 41 in Carver County, in the lower half of the local distribution.

Wassermann Main Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. Bass fishing is part of the appeal: the species list runs to 13, anchored by largemouth and/or smallmouth bass. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been recorded 20 times at Wassermann Main Lake, with a median around Mar 31. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.