Is Third River Flowage Lake Safe for Swimming?
Third River Flowage Lake in Itasca County, Minnesota has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 6.9 ft visibility. Phosphorus: 28.5 µg/L. Chlorophyll-a (algae): 5.5 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 6.9 ft |
| Phosphorus | 28.5 μg/L |
| Chlorophyll-a (Algae) | 5.5 μg/L |
| Maximum Depth | 69.8 ft |
| Location | Itasca County, Minnesota |
How does Third River Flowage Lake compare?
With an overall water quality grade of C, Third River Flowage Lake matches or beats the Minnesota state average of Grade C. It ranks #61 of 72 lakes in Itasca County by water quality score.
Water clarity (Secchi depth) sits at 6.9 feet. That puts the lake in good clarity range, with limited algae interference. Algae levels (chlorophyll-a) measure 5.5 µg/L — low and well within safe swimming guidelines.