Windfall Lake

Windfall Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI near 46 places Windfall Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake bottoms out at 25 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Windfall Lake is small — 53 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Windfall Lake ranks 15 of 34 in Forest County — solidly in the upper half of the local distribution.

Windfall Lake has no invasive species recorded in Wisconsin state databases as of 2026, though prevention practices still apply at all access points. The fishery is bass-led, with 4 documented species across the lake's records. A documented public access point at Windfall Lake 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.