Oneida Lake

On the LakeGrade scale Oneida Lake grades a B, with clarity at 8.0 ft and 23 µg/L of phosphorus placing it above the Wisconsin median. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

Mesotrophic conditions dominate at Oneida Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 34 ft puts Oneida Lake in the middle of Wisconsin's depth distribution. Oneida Lake covers 255 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Oneida Lake ranks 62 of 134 in Oneida County — solidly in the upper half of the local distribution.

Oneida Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. The fishery includes walleye among the lake's 6 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.