How Clean Is Nichols Lake?
Nichols 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): 5.1 ft. Phosphorus: 20.5 µg/L. Trophic State Index: 51.
Cleanliness Snapshot
| Metric | Nichols Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 5.1 ft | — |
| Phosphorus | 20.5 µg/L | <30 = clean |
| Trophic State Index | 51 | <50 = clean |
How does Nichols Lake compare?
Nichols Lake's grade of C matches or beats the Minnesota state average of C. It ranks #112 of 187 lakes in St. Louis County by water quality score.