Is Jefferson Lake Safe for Swimming?
Jefferson Lake in Le Sueur County, Minnesota has a water quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Water clarity: 2 ft visibility. Phosphorus: 90 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Very Poor) |
| Water Clarity (Secchi Depth) | 2 ft |
| Phosphorus | 90 μg/L |
| Location | Le Sueur County, Minnesota |
How does Jefferson Lake compare?
With an overall water quality grade of F, Jefferson Lake falls below the Minnesota state average of Grade C. It ranks #12 of 14 lakes in Le Sueur County by water quality score.
Water clarity (Secchi depth) sits at 2 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff.