Green Lake

On the LakeGrade scale Green Lake grades a B, with clarity at 12.1 ft and 36 µg/L of phosphorus placing it above the Wisconsin median. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

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 just 9 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. The lake is compact at 50 acres, with partial shoreline records and little volume to buffer nutrient inputs. Green Lake ranks 45 of 52 in Sawyer County — at the lower end of the locally monitored distribution.

Green Lake has no invasive species recorded in Wisconsin state databases as of 2021, though prevention practices still apply at all access points. The fishery is bass-led, with 2 documented species across the lake's records. A documented public access point at Green Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is supported by multiple sampling years from the Wisconsin DNR Citizen Lake Monitoring Network, giving the letter a reasonably stable foundation.