Emma Lake

Emma Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in 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.

A TSI value of 35 puts Emma Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. A maximum depth of 17 ft puts Emma Lake in the middle of Wisconsin's depth distribution. Emma Lake covers 227 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Emma Lake ranks 60 of 140 in Oneida County — solidly in the upper half of the local distribution.

Emma Lake has no invasive species recorded in Wisconsin state databases as of 2025, though prevention practices still apply at all access points. Walleye are documented at Emma Lake, one of 5 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.