Mary Lake

Mary Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Langlade County. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

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 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 32 graded lakes in Langlade County, Mary Lake sits at rank 9, 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.