Lower Spring Lake

On the LakeGrade scale Lower Spring Lake grades a B, with clarity at 16.4 ft and 47 µg/L of phosphorus placing it above the Wisconsin median. Phosphorus is the parameter holding the grade back — runoff from the surrounding watershed appears to keep nutrient levels elevated through the summer.

A TSI near 48 places Lower Spring Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. 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 5 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.