Devils Lake

Devils Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. Devils Lake reaches 47 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. Devils Lake covers 374 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Among the 11 graded lakes in Sauk County, Devils Lake sits at rank 5, above the county median.

Devils Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. The fishery includes walleye among the lake's 6 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.