High Falls Reservoir at

High Falls Reservoir at earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Marinette County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Trophically, High Falls Reservoir at reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. High Falls Reservoir at is unusually deep for Wisconsin at 54 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. High Falls Reservoir at covers 1,471 acres alongside partial shoreline records, large enough that conditions can vary meaningfully between bays. High Falls Reservoir at sits at rank 16 of 22 in Marinette County, in the lower half of the local distribution.

Zebra mussel presence at High Falls Reservoir at means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. The fishery includes walleye alongside the lake's other 6 documented species — a notable draw for Wisconsin anglers. A documented public access point at High Falls Reservoir at 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.