Cranberry Lake

On the LakeGrade scale Cranberry Lake grades a B, with clarity at 15.1 ft and 31 µg/L of phosphorus placing it above the Wisconsin median. Of the three parameters, phosphorus is the worst — at 31 µg/L of phosphorus, it keeps the lake susceptible to algal blooms in warm years.

Mesotrophic conditions dominate at Cranberry Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 23 ft puts Cranberry Lake in the middle of Wisconsin's depth distribution. Cranberry Lake covers 924 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within the 140 graded lakes of Oneida County, Cranberry Lake sits at rank 106, near the bottom of the county list.

Cranberry Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. Walleye are documented at Cranberry Lake, one of 6 fish species on record for the lake. A documented public access point at Cranberry 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.