Is Trenton Lake Safe for Swimming?
Trenton Lake in Williams County, North Dakota has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 1.5 ft visibility. Chlorophyll-a (algae): 4.2 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 1.5 ft |
| Chlorophyll-a (Algae) | 4.2 μg/L |
| Maximum Depth | 8.1 ft |
| Location | Williams County, North Dakota |
How does Trenton Lake compare?
With an overall water quality grade of C, Trenton Lake matches or beats the North Dakota state average of Grade C. It ranks #5 of 9 lakes in Williams County by water quality score.
Water clarity (Secchi depth) sits at 1.5 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 4.2 µg/L — low and well within safe swimming guidelines.