East Twin Lake

East Twin Lake comes in at a B on the grading rubric — a respectable showing for a Wisconsin lake of its size and depth. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Wisconsin norms.

At a TSI of 53, East Twin Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. At only 8 ft deep, East Twin Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. East Twin Lake is small — 13 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Within Marquette County's 13 graded lakes, East Twin Lake ranks 8 — below the local median, though not at the bottom.

Eurasian watermilfoil is established at East Twin Lake, which can dampen recreational access and pressure the native plant community. The state fisheries records do not list documented species for East Twin Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.