Green Lake

Green Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Oconto County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Mesotrophic conditions dominate at Green Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 25 ft puts Green Lake in the middle of Wisconsin's depth distribution. At 21 acres, Green Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Green Lake ranks 5 of 62 in Oconto County, putting it in the upper tier of locally monitored lakes.

An invasive species record — Banded Mystery Snail — has been logged at Green Lake; Wisconsin DNR maintains the official infested-waters list. The fishery is bass-led, with 2 documented species across the lake's records. Public access is available — the lake is on the Wisconsin DNR public-access list. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.