Is O'Brien Lake Safe for Swimming?
O'Brien Lake in Itasca County, Minnesota has a water quality grade of B (Good). Good for swimming, clear water with low algae levels. Water clarity: 13.1 ft visibility. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | B (Good) |
| Water Clarity (Secchi Depth) | 13.1 ft |
| Maximum Depth | 63 ft |
| Location | Itasca County, Minnesota |
How does O'Brien Lake compare?
With an overall water quality grade of B, O'Brien Lake matches or beats the Minnesota state average of Grade C. It ranks #76 of 146 lakes in Itasca County by water quality score.
Water clarity (Secchi depth) sits at 13.1 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.