John'S Lake

On the LakeGrade rubric, John'S Lake pulls an A: clarity at 44.3 ft and phosphorus readings still being added put it in the top bracket for Wisconsin. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI value of 22 puts John'S Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake bottoms out at 41 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. The lake is compact at 71 acres, with partial shoreline records and little volume to buffer nutrient inputs. John'S Lake sits at rank 19 of 30 in Waushara County, in the lower half of the local distribution.

Zebra mussel presence at John'S Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. The lake's fish records list 3 species — a varied community without one dominant gamefish. Public access is available — the lake is on the Wisconsin DNR public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.