Is Big Round Lake Safe for Swimming?
Big Round Lake in Polk County, Wisconsin has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 5 ft visibility. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 6.9 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 5 ft |
| Phosphorus | 27 μg/L |
| Chlorophyll-a (Algae) | 6.9 μg/L |
| Maximum Depth | 17 ft |
| Location | Polk County, Wisconsin |
How does Big Round Lake compare?
With an overall water quality grade of C, Big Round Lake falls below the Wisconsin state average of Grade B. It ranks #28 of 55 lakes in Polk County by water quality score.
Water clarity (Secchi depth) sits at 5 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 6.9 µg/L — low and well within safe swimming guidelines.