How Clean Is Greenwood Lake?
Greenwood 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): 14.8 ft. Phosphorus: 8 µg/L. Trophic State Index: 36.
Cleanliness Snapshot
| Metric | Greenwood Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 14.8 ft | — |
| Phosphorus | 8 µg/L | <30 = clean |
| Trophic State Index | 36 | <50 = clean |
How does Greenwood Lake compare?
Greenwood Lake's grade of A matches or beats the Minnesota state average of C. It ranks #36 of 128 lakes in Cook County by water quality score. Multi-year monitoring data shows water quality is stable based on 3 years of records.