Mary Lake

Mary Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Mesotrophic conditions dominate at Mary Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. Mary Lake reaches 46 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. Mary Lake covers 190 acres alongside 2.3 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Mary Lake ranks 20 of 64 in Wright County — solidly in the upper half of the local distribution.

Mary Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. Walleye are documented at Mary Lake, one of 13 fish species on record for the lake. The lake lacks a documented public access point, so visitor use is limited. The lake has a long ice-out record — 97 observations on file, with a median ice-out around Apr 9. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.