Tuttle Lake

On the LakeGrade rubric, Tuttle Lake pulls an A: clarity at 37.9 ft and 16 µg/L of phosphorus put it in the top bracket for Wisconsin. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

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. A maximum depth of 33 ft puts Tuttle Lake in the middle of Wisconsin's depth distribution. The lake's 151 acres and partial shoreline records put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Within Marquette County's 14 graded lakes, Tuttle Lake ranks 8 — below the local median, though not at the bottom.

No invasive species are currently listed at Tuttle Lake — the lake remains off the Wisconsin infested-waters roster. The fishery is bass-led, with 3 documented species across the lake's records. Public access is available — the lake is on the Wisconsin DNR public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.