How Clean Is Orwell Lake?
Orwell Lake has fair water quality — typical of lakes with moderate nutrient enrichment. It received a water quality grade of C (Fair) based on EPA monitoring data. Water clarity (Secchi depth): 4.1 ft. Phosphorus: 54 µg/L. Trophic State Index: 59.
Cleanliness Snapshot
| Metric | Orwell Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 4.1 ft | — |
| Phosphorus | 54 µg/L | <30 = clean |
| Trophic State Index | 59 | <50 = clean |
How does Orwell Lake compare?
Orwell Lake's grade of C matches or beats the Minnesota state average of C. It ranks #86 of 97 lakes in Otter Tail County by water quality score. Multi-year monitoring data shows water quality is declining based on 2 years of records.