How Clean Is South Turtle Lake?
South Turtle 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): 14.1 ft. Phosphorus: 20 µg/L. Trophic State Index: 43.
Cleanliness Snapshot
| Metric | South Turtle Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 14.1 ft | — |
| Phosphorus | 20 µg/L | <30 = clean |
| Trophic State Index | 43 | <50 = clean |
How does South Turtle Lake compare?
South Turtle Lake's grade of B matches or beats the Minnesota state average of C. It ranks #57 of 97 lakes in Otter Tail County by water quality score. Multi-year monitoring data shows water quality is stable based on 5 years of records.