Lilly Lake

Lilly Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Kenosha 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 32 puts Lilly Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. A maximum depth of 22 ft puts Lilly Lake in the middle of Wisconsin's depth distribution. At 85 acres, Lilly Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Lilly Lake ranks 4 of 13 in Kenosha County — solidly in the upper half of the local distribution.

Lilly Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. 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.