Middle Lake -Spread Eagle Chain

Middle Lake -Spread Eagle Chain sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Trophically, Middle Lake -Spread Eagle Chain reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. Middle Lake -Spread Eagle Chain is unusually deep for Wisconsin at 54 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. At 83 acres, Middle Lake -Spread Eagle Chain sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Middle Lake -Spread Eagle Chain ranks 36 of 39 in Florence County — at the lower end of the locally monitored distribution.

Middle Lake -Spread Eagle Chain is on the Wisconsin infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. Walleye are documented at Middle Lake -Spread Eagle Chain, one of 5 fish species on record for the lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.