A2 Lake

A2 Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. 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.

Mesotrophic conditions dominate at A2 Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. At 50 ft of maximum depth, A2 Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. At 392 acres, A2 Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Within the 66 graded lakes of Oconto County, A2 Lake sits at rank 63, near the bottom of the county list.

A2 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. 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.