Lower Spring Lake

The LakeGrade rubric puts Lower Spring Lake at a C: clarity at 5.0 ft, 47 µg/L of phosphorus, and a TSI of 57 signal an intermediate trophic state. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

At a TSI of 57, Lower Spring Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. 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. Lower Spring Lake sits at rank 6 of 8 in Jefferson County, in the lower half of the local distribution.

No invasive species are currently listed at Lower Spring Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Lower Spring Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.