Long Lake Plainfield

On the LakeGrade rubric, Long Lake Plainfield pulls an A: clarity at 21.3 ft and phosphorus readings still being added put it in the top bracket for Wisconsin. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI value of 33 puts Long Lake Plainfield in the oligotrophic range, where biological productivity stays low and the water column remains clear. At only 14 ft deep, Long Lake Plainfield is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. Long Lake Plainfield is small — 40 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Long Lake Plainfield ranks 9 of 30 in Waushara County — solidly in the upper half of the local distribution.

Long Lake Plainfield has at least one documented invasive species (Banded Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. Bass fishing is part of the appeal: the species list runs to 3, anchored by largemouth and/or smallmouth bass. A documented public access point at Long Lake Plainfield makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.