Ogishkemuncie Lake

On the LakeGrade scale Ogishkemuncie Lake grades a B, with clarity at 12.0 ft and phosphorus readings still being added placing it above the Minnesota median. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Mesotrophic conditions dominate at Ogishkemuncie Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. Ogishkemuncie Lake is unusually deep for Minnesota at 75 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. The lake's 762 acres and 23.9 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Among the 142 graded lakes in Lake County, Ogishkemuncie Lake sits at rank 55, above the county median.

No invasive species are currently listed at Ogishkemuncie Lake — the lake remains off the Minnesota infested-waters roster. The fishery includes walleye alongside the lake's other 5 documented species — a notable draw for Minnesota anglers. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.