Mid Lake

On the LakeGrade scale Mid Lake grades a B, with clarity at 7.0 ft and 25 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 Mid Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. Mid Lake is a shallow lake at 12 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. Mid Lake covers 221 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Mid Lake ranks 61 of 134 in Oneida County — solidly in the upper half of the local distribution.

Eurasian watermilfoil is established at Mid Lake, which can dampen recreational access and pressure the native plant community. Walleye are documented at Mid Lake, one of 6 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.