Is Jamestown Reservoir Safe for Swimming?
Jamestown Reservoir in Stutsman County, North Dakota has a water quality grade of D (Poor). Swimming not recommended, poor water quality with high algae risk. Water clarity: 6 ft visibility. Phosphorus: 560.5 µg/L. Chlorophyll-a (algae): 17.6 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | D (Poor) |
| Water Clarity (Secchi Depth) | 6 ft |
| Phosphorus | 560.5 μg/L |
| Chlorophyll-a (Algae) | 17.6 μg/L |
| Maximum Depth | 36.2 ft |
| Location | Stutsman County, North Dakota |
How does Jamestown Reservoir compare?
With an overall water quality grade of D, Jamestown Reservoir falls below the North Dakota state average of Grade C. It ranks #6 of 7 lakes in Stutsman County by water quality score.
Water clarity (Secchi depth) sits at 6 feet. That puts the lake in good clarity range, with limited algae interference. Algae levels (chlorophyll-a) measure 17.6 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.