Is Mill Creek Lake Safe for Swimming?
Mill Creek Lake in O'Brien County, Wisconsin has a water quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Water clarity: 3 ft visibility. Chlorophyll-a (algae): 36.1 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Very Poor) |
| Water Clarity (Secchi Depth) | 3 ft |
| Chlorophyll-a (Algae) | 36.1 μg/L |
| Location | O'Brien County, Wisconsin |
How does Mill Creek Lake compare?
With an overall water quality grade of F, Mill Creek Lake falls below the Wisconsin state average of Grade D. It ranks #2 of 2 lakes in O'Brien County by water quality score.
Water clarity (Secchi depth) sits at 3 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 36.1 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.