How Clean Is Otrey Lake?
Otrey Lake has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 1 ft. Phosphorus: 431 µg/L. Trophic State Index: 84.
Cleanliness Snapshot
| Metric | Otrey Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 1 ft | — |
| Phosphorus | 431 µg/L | <30 = clean |
| Trophic State Index | 84 | <50 = clean |
How does Otrey Lake compare?
Otrey Lake's grade of F falls below the Minnesota state average of C. It ranks #7 of 9 lakes in Big Stone County by water quality score. Multi-year monitoring data shows water quality is stable based on 2 years of records.