De Neveu Lake

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

Trophically, De Neveu Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. De Neveu Lake is unusually deep for Wisconsin at 67 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. The lake is compact at 80 acres, with partial shoreline records and little volume to buffer nutrient inputs. Among the 10 graded lakes in Fond du Lac County, De Neveu Lake ranks 2 — in the top quartile locally.

De Neveu Lake is on the Wisconsin infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. The fishery includes walleye alongside the lake's other 4 documented species — a notable draw for Wisconsin anglers. 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.