Is Big Butternut Lake Safe for Swimming?
Big Butternut Lake in Polk County, Wisconsin has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 14.8 ft visibility. Phosphorus: 62.1 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 14.8 ft |
| Phosphorus | 62.1 μg/L |
| Maximum Depth | 19 ft |
| Location | Polk County, Wisconsin |
How does Big Butternut Lake compare?
With an overall water quality grade of C, Big Butternut Lake falls below the Wisconsin state average of Grade B. It ranks #64 of 77 lakes in Polk County by water quality score.
Water clarity (Secchi depth) sits at 14.8 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.