How Clean Is Turtle Lake?
Turtle Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 3 ft. Phosphorus: 58.5 µg/L. Chlorophyll-a (algae): 25.4 µg/L. Trophic State Index: 62.
Cleanliness Snapshot
| Metric | Turtle Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 3 ft | — |
| Phosphorus | 58.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 25.4 µg/L | <10 = clean |
| Trophic State Index | 62 | <50 = clean |
How does Turtle Lake compare?
Turtle Lake's grade of D falls below the Minnesota state average of C. It ranks #12 of 19 lakes in Polk County by water quality score. Multi-year monitoring data shows water quality is stable based on 6 years of records.