Is Big Lake Safe for Swimming?
Big Lake in Mahnomen County, Minnesota has a water quality grade of D (Poor). Swimming not recommended — poor water quality with high algae risk. Water clarity: 2.1 ft visibility. Phosphorus: 33 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | D (Poor) |
| Water Clarity (Secchi Depth) | 2.1 ft |
| Phosphorus | 33 μg/L |
| Location | Mahnomen County, Minnesota |