Is Castle Rock Dam Lake Safe for Swimming?
Castle Rock Dam Lake in Hettinger County, Wisconsin has a water quality grade of D (Poor). Swimming not recommended, poor water quality with high algae risk. Water clarity: 3.8 ft visibility. Chlorophyll-a (algae): 24.3 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | D (Poor) |
| Water Clarity (Secchi Depth) | 3.8 ft |
| Chlorophyll-a (Algae) | 24.3 μg/L |
| Location | Hettinger County, Wisconsin |
How does Castle Rock Dam Lake compare?
With an overall water quality grade of D, Castle Rock Dam Lake falls below the Wisconsin state average of Grade C. It ranks #3 of 3 lakes in Hettinger County by water quality score.
Water clarity (Secchi depth) sits at 3.8 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 24.3 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.