Muskego Lake

Muskego Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

At a TSI of 63, Muskego Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of 23 ft puts Muskego Lake in the middle of Wisconsin's depth distribution. At 2,194 acres, Muskego Lake is one of the larger lakes in Waukesha County, with partial shoreline records supporting multiple distinct use patterns. Within the 45 graded lakes of Waukesha County, Muskego Lake sits at rank 40, near the bottom of the county list.

Eurasian watermilfoil has been documented at Muskego Lake, requiring shoreline management to keep dense mats from crowding native vegetation. The fishery is bass-led, with 3 documented species across the lake's records. A documented public access point at Muskego 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.