Is Jamestown Reservoir Safe for Swimming?
Jamestown Reservoir in Stutsman County, North Dakota has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 7.2 ft visibility. Phosphorus: 527 µg/L. Chlorophyll-a (algae): 8.6 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 7.2 ft |
| Phosphorus | 527 μg/L |
| Chlorophyll-a (Algae) | 8.6 μg/L |
| Location | Stutsman County, North Dakota |
How does Jamestown Reservoir compare?
With an overall water quality grade of C, Jamestown Reservoir matches or beats the North Dakota state average of Grade C. It ranks #1 of 3 lakes in Stutsman County by water quality score.
Water clarity (Secchi depth) sits at 7.2 feet. That puts the lake in good clarity range, with limited algae interference. Algae levels (chlorophyll-a) measure 8.6 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.
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