Is Big Round Lake Safe for Swimming?
Big Round Lake in Polk County, Wisconsin has a water quality grade of C (Fair). Swim with caution, moderate algae may be present. Water clarity: 5.6 ft visibility. Phosphorus: 27.6 µg/L. Chlorophyll-a (algae): 21 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 5.6 ft |
| Phosphorus | 27.6 μg/L |
| Chlorophyll-a (Algae) | 21 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 #68 of 77 lakes in Polk County by water quality score.
Water clarity (Secchi depth) sits at 5.6 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 21 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.