Long Lake

Long Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Oneida County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI value of 24 puts Long Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. At 58 ft of maximum depth, Long Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. At 113 acres, Long Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Long Lake ranks 1 of 140 in Oneida County, putting it in the upper tier of locally monitored lakes.

Long Lake has no invasive species recorded in Wisconsin state databases as of 2023, though prevention practices still apply at all access points. Walleye are documented at Long Lake, one of 4 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.