How Clean Is Lake Jefferson?
Lake Jefferson has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 5 ft. Trophic State Index: 54.
Cleanliness Snapshot
| Metric | Lake Jefferson | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 5 ft | — |
| Trophic State Index | 54 | <50 = clean |
How does Lake Jefferson compare?
Lake Jefferson's grade of D falls below the Minnesota state average of C. It ranks #7 of 14 lakes in Le Sueur County by water quality score. Multi-year monitoring data shows water quality is stable based on 5 years of records.