Swift Lake

On the scoring rubric Swift Lake grades a D: clarity at 6.0 ft and phosphorus readings still being added keep it in the lower bracket for Walworth County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. 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 the 35 graded lakes of Walworth County, Swift Lake sits at rank 30, near the bottom of the county list.

No invasive species are currently listed at Swift Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Swift Lake, 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.