Is Third River Flowage Lake Safe for Swimming?
Third River Flowage Lake in Itasca County, Minnesota has nutrient and algae measurements on record from state and federal monitoring. A water-quality reading is not a swimming clearance. The state water agency and county health departments post current advisories; check them before you swim.. 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 |
|---|---|
| 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 readings of —, Third River Flowage Lake matches or beats the Minnesota state average. 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.
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