Crystal Lake

On the LakeGrade scale Crystal Lake grades a B, with clarity at 12.8 ft and phosphorus readings still being added placing it above the Wisconsin median.

A TSI near 40 places Crystal Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake bottoms out at 36 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Crystal Lake is small — 75 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Among the 32 graded lakes in Langlade County, Crystal Lake ranks 8 — in the top quartile locally.

No invasive species are currently listed at Crystal Lake — the lake remains off the Wisconsin infested-waters roster. The fishery is bass-led, with 3 documented species across the lake's records. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.