West Twin Lake

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

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. A maximum depth of 24 ft puts West Twin Lake in the middle of Wisconsin's depth distribution. The lake is compact at 13 acres, with partial shoreline records and little volume to buffer nutrient inputs. Within the 13 graded lakes of Marquette County, West Twin Lake sits at rank 11, near the bottom of the county list.

Eurasian watermilfoil is established at West Twin Lake, which can dampen recreational access and pressure the native plant community. The fishery includes walleye among the lake's 3 documented species — a notable draw for Wisconsin anglers. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.