How Clean Is O'Brien Lake?
O'Brien 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): 13.1 ft. Trophic State Index: 40.
Cleanliness Snapshot
| Metric | O'Brien Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 13.1 ft | — |
| Trophic State Index | 40 | <50 = clean |
How does O'Brien Lake compare?
O'Brien Lake's grade of B matches or beats the Minnesota state average of C. It ranks #76 of 146 lakes in Itasca County by water quality score.