How Clean Is Four Lake?
Four Lake 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): 6.4 ft. Trophic State Index: 50.
Cleanliness Snapshot
| Metric | Four Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 6.4 ft | — |
| Trophic State Index | 50 | <50 = clean |
How does Four Lake compare?
Four Lake's grade of D falls below the Minnesota state average of C. It ranks #122 of 142 lakes in Lake County by water quality score. Multi-year monitoring data shows water quality is improving based on 2 years of records.