Mary Lake

On the LakeGrade scale Mary Lake grades a B, with clarity at 7.0 ft and 18 µg/L of phosphorus placing it above the Wisconsin median. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. A maximum depth of 20 ft puts Mary Lake in the middle of Wisconsin's depth distribution. At 154 acres, Mary Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Among the 33 graded lakes in Langlade County, Mary Lake sits at rank 10, above the county median.

Mary Lake has at least one documented invasive species (Banded Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. The fishery is bass-led, with 2 documented species across the lake's records. A documented public access point at Mary 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.