Beauleau Lake

On the LakeGrade rubric, Beauleau Lake pulls an A: clarity at 31.2 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 28 puts Beauleau Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake bottoms out at 24 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 27 acres, Beauleau Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Beauleau Lake ranks 4 of 27 in Shawano County, putting it in the upper tier of locally monitored lakes.

Eurasian watermilfoil has been documented at Beauleau Lake, requiring shoreline management to keep dense mats from crowding native vegetation. The fishery includes walleye alongside the lake's other 4 documented species — a notable draw for Wisconsin anglers. 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.