How Clean Is Turtle Lake?
Turtle 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): 3.6 ft. Phosphorus: 56.5 µg/L. Trophic State Index: 60.
Cleanliness Snapshot
| Metric | Turtle Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 3.6 ft | — |
| Phosphorus | 56.5 µg/L | <30 = clean |
| Trophic State Index | 60 | <50 = clean |
How does Turtle Lake compare?
Turtle Lake's grade of C matches or beats the Minnesota state average of C. It ranks #11 of 20 lakes in Polk County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.