Roberts Lake

Roberts 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.

Trophically, Roberts Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. A maximum depth of 31 ft puts Roberts Lake in the middle of Wisconsin's depth distribution. At 435 acres, Roberts Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Among the 35 graded lakes in Forest County, Roberts Lake sits at rank 13, above the county median.

Zebra mussel presence at Roberts Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. Walleye are documented at Roberts Lake, one of 6 fish species on record for the lake. 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.