Wood Lake

Wood Lake sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. Wood Lake is unusually deep for Wisconsin at 53 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. At 82 acres, Wood Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Wood Lake ranks 3 of 13 in Marquette County, putting it in the upper tier of locally monitored lakes.

Eurasian watermilfoil has been documented at Wood Lake, requiring shoreline management to keep dense mats from crowding native vegetation. The fishery includes walleye among the lake's 4 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.