Killarney Lake

On the scoring rubric Killarney Lake grades a D: clarity at 5.7 ft and phosphorus readings still being added keep it in the lower bracket for Oneida County. 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.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. At only 8 ft deep, Killarney Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. Killarney Lake covers 293 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within the 140 graded lakes of Oneida County, Killarney Lake sits at rank 138, near the bottom of the county list.

Killarney Lake has no invasive species recorded in Wisconsin state databases as of 2025, though prevention practices still apply at all access points. The fishery is bass-led, with 3 documented species across the lake's records. 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.