Rock Lake

The LakeGrade rubric puts Rock Lake at a C: clarity at 6.2 ft, 26 µg/L of phosphorus, and a TSI of 51 signal an intermediate trophic state. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

At a TSI of 51, Rock Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of 18 ft puts Rock Lake in the middle of Wisconsin's depth distribution. At 120 acres, Rock Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Within Vilas County's 191 graded lakes, Rock Lake ranks 139 — below the local median, though not at the bottom.

An invasive species record — Rusty Crayfish — has been logged at Rock Lake; Wisconsin DNR maintains the official infested-waters list. Walleye are documented at Rock Lake, one of 5 fish species on record for the lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.