How Clean Is Prairie Lake?
Prairie Lake is a clean lake by Minnesota standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 8.9 ft. Phosphorus: 18 µg/L. Chlorophyll-a (algae): 7.3 µg/L. Trophic State Index: 47.
Cleanliness Snapshot
| Metric | Prairie Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 8.9 ft | — |
| Phosphorus | 18 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 7.3 µg/L | <10 = clean |
| Trophic State Index | 47 | <50 = clean |
How does Prairie Lake compare?
Prairie Lake's grade of B matches or beats the Minnesota state average of C. It ranks #50 of 66 lakes in Otter Tail County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.
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