Little Winnibigoshish Lake

Little Winnibigoshish Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. The lake bottoms out at 28 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 1,002 acres, Little Winnibigoshish Lake is one of the larger lakes in Itasca County, with 5.8 miles of shoreline supporting multiple distinct use patterns. Within the 146 graded lakes of Itasca County, Little Winnibigoshish Lake sits at rank 123, near the bottom of the county list.

Zebra mussels have been documented at Little Winnibigoshish Lake, which alters the filter-feeding balance and can paradoxically increase water clarity while disrupting the food web. Walleye are documented at Little Winnibigoshish Lake, one of 16 fish species on record for the lake. A documented public access point at Little Winnibigoshish Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.