West Twin Lake

West Twin Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Of the three parameters, phosphorus is the worst — at 53 µg/L of phosphorus, it keeps the lake susceptible to algal blooms in warm years.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. 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 14 graded lakes of Marquette County, West Twin Lake sits at rank 12, 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 alongside the lake's other 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.