Little Lac Courte Oreilles Lake

Little Lac Courte Oreilles Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI near 41 places Little Lac Courte Oreilles Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake bottoms out at 46 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Little Lac Courte Oreilles Lake covers 221 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Among the 50 graded lakes in Sawyer County, Little Lac Courte Oreilles Lake sits at rank 24, above the county median.

Eurasian watermilfoil has been documented at Little Lac Courte Oreilles Lake, requiring shoreline management to keep dense mats from crowding native vegetation. Walleye are documented at Little Lac Courte Oreilles Lake, one of 6 fish species on record for the lake. Multiple sampling years from the Wisconsin DNR Citizen Lake Monitoring Network back the grade, so the letter should hold steady absent a major watershed shift.