Ashegon Lake

Ashegon Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Sawyer County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI value of 40 puts Ashegon Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake's 56 ft maximum depth is in the upper tier for Wisconsin — deep enough for cold-water fish to find refuge in summer. Ashegon Lake is small — 75 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Ashegon Lake ranks 19 of 52 in Sawyer County — solidly in the upper half of the local distribution.

An invasive species record — Chinese Mystery Snail — has been logged at Ashegon Lake; Wisconsin DNR maintains the official infested-waters list. The fishery includes walleye alongside the lake's other 6 documented species — a notable draw for Wisconsin anglers. Public access is available — the lake is on the Wisconsin DNR public-access list. Multiple sampling years from the Wisconsin DNR Citizen Lake Monitoring Network back the grade, so the letter should hold steady absent a major watershed shift.