Long Lake -Spread Eagle Chain

Long Lake -Spread Eagle Chain earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Florence County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI value of 22 puts Long Lake -Spread Eagle Chain in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Within Florence County's 39 graded lakes, Long Lake -Spread Eagle Chain ranks 25 — below the local median, though not at the bottom.

Long Lake -Spread Eagle Chain has no invasive species recorded in Wisconsin state databases as of 2022, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Long Lake -Spread Eagle Chain, which usually reflects a lack of formal fisheries survey work rather than an empty lake. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.