High Falls Reservoir at

The LakeGrade rubric puts High Falls Reservoir at at a C: clarity at 9.5 ft, phosphorus readings still being added, and a TSI of 45 signal an intermediate trophic state. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI near 45 places High Falls Reservoir at in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. 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. Within the 21 graded lakes of Marinette County, High Falls Reservoir at sits at rank 17, near the bottom of the county list.

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.