Cranberry Lake

The LakeGrade rubric puts Cranberry Lake at a C: clarity at 4.5 ft, 31 µg/L of phosphorus, and a TSI of 55 signal an intermediate trophic state. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. 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. Cranberry Lake sits at rank 94 of 134 in Oneida County, in the lower half of the local distribution.

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.