Long Lake Plainfield

Long Lake Plainfield earns a D — measurements through 2020 show persistent nutrient pressure that limits clarity through the summer. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. 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 31 of 32 in Waushara County — at the lower end of the locally monitored 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.