North Lake

North 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 21 puts North Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. A maximum depth of 43 ft puts North Lake in the middle of Wisconsin's depth distribution. At 79 acres, North Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. North Lake ranks 10 of 39 in Florence County — solidly in the upper half of the local distribution.

North Lake is on the Wisconsin infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. The fishery includes walleye alongside the lake's other 5 documented species — a notable draw for Wisconsin anglers. A documented public access point at North 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.