Is Deep Portage Lake Safe for Swimming?
Deep Portage Lake in Cass County, Minnesota has a water quality grade of A (Excellent). Excellent for swimming — crystal clear water with minimal algae. Water clarity: 15.4 ft visibility. Phosphorus: 10 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | A (Excellent) |
| Water Clarity (Secchi Depth) | 15.4 ft |
| Phosphorus | 10 μg/L |
| Maximum Depth | 105 ft |
| Location | Cass County, Minnesota |