Geneva Lake Site B

On the LakeGrade rubric, Geneva Lake Site B pulls an A: clarity at 24.1 ft and 13 µg/L of phosphorus put it in the top bracket for Wisconsin. 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.

A TSI value of 36 puts Geneva Lake Site B in the oligotrophic range, where biological productivity stays low and the water column remains clear. Geneva Lake Site B is unusually deep for Wisconsin at 135 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. With 5,401 acres of surface and partial shoreline records, Geneva Lake Site B is a large water by Wisconsin standards — recreational pressure is spread across a long shoreline. Among the 34 graded lakes in Walworth County, Geneva Lake Site B sits at rank 15, above the county median.

Geneva Lake Site B 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. Walleye are documented at Geneva Lake Site B, one of 6 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.