Hewitt Lake

Hewitt Lake sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI value of 19 puts Hewitt Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake's 88 ft maximum depth is in the upper tier for Wisconsin — deep enough for cold-water fish to find refuge in summer. Hewitt Lake is small — 79 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Hewitt Lake sits at rank 22 of 34 in Iron County, in the lower half of the local distribution.

Hewitt Lake has no invasive species recorded in Wisconsin state databases as of 2024, though prevention practices still apply at all access points. The fishery is bass-led, with 3 documented species across the lake's records. A documented public access point at Hewitt Lake 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.