Little Big Lake

On the LakeGrade scale Little Big Lake grades a B, with clarity at 9.3 ft and 14 µg/L of phosphorus placing it above the Minnesota median. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

Mesotrophic conditions dominate at Little Big Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake bottoms out at 35 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Little Big Lake covers 3,598 acres alongside 16.6 miles of shoreline, large enough that conditions can vary meaningfully between bays. Little Big Lake sits at rank 49 of 86 in Beltrami County, in the lower half of the local distribution.

Zebra mussel presence at Little Big Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. Muskie are on the species list at Little Big Lake, alongside the lake's 17 other documented fish. A documented public access point at Little Big Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 13 times at Little Big Lake, with a median around Apr 24. The grade is supported by multiple sampling years from Minnesota PCA volunteers and partner agencies, giving the letter a reasonably stable foundation.