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.

A TSI value of 32 puts Green Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. 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 14 of 66 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.