How Clean Is Otter Tail Lake?
Otter Tail Lake is among the cleanest lakes in Minnesota. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 12.1 ft. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 5.5 µg/L. Trophic State Index: 44.
Cleanliness Snapshot
| Metric | Otter Tail Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 12.1 ft | — |
| Phosphorus | 16 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 5.5 µg/L | <10 = clean |
| Trophic State Index | 44 | <50 = clean |
How does Otter Tail Lake compare?
Otter Tail Lake's grade of A matches or beats the Minnesota state average of C. It ranks #36 of 66 lakes in Otter Tail County by water quality score. Multi-year monitoring data shows water quality is stable based on 6 years of records.
Watch Otter Tail Lake water quality
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