Mary Lake

On the scoring rubric Mary Lake grades a D: clarity at 5.5 ft and phosphorus readings still being added keep it in the lower bracket for Wright County.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. At 102 ft of maximum depth, Mary Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. Mary Lake covers 196 acres alongside 2.4 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Mary Lake sits at rank 40 of 64 in Wright County, in the lower half of the local distribution.

Eurasian watermilfoil has been documented at Mary Lake, requiring shoreline management to keep dense mats from crowding native vegetation. Walleye are documented at Mary Lake, one of 13 fish species on record for the lake. A documented public access point at Mary Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 5 times at Mary Lake, with a median around Apr 4. 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.