Jamestown Reservoir
Jamestown Reservoir is a rockfill dam located in Newport County, Rhode Island, built in 1940. It carries a Significant hazard potential classification and has a fair condition assessment.
About Jamestown Reservoir
The primary purpose of Jamestown Reservoir is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Jamestown, Town Of (local government). It impounds the Jamestown Brook near Jamestown.
The dam stands 10 feet tall and stretches 916 feet across, creates a reservoir covering 26 acres, has a maximum storage capacity of 195 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam.
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Location
| State | Rhode Island |
| County | Newport |
| Nearest City | Jamestown |
| River/Stream | Jamestown Brook |
| Coordinates | 41.52966, -71.37450 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 10 ft |
| Dam Height | 9 ft |
| Dam Length | 916 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 195 acre-ft |
| Max Storage | 195 acre-ft |
| Normal Storage | 117 acre-ft |
| Surface Area | 26 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 85 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | JAMESTOWN, TOWN OF |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | RI01501 |
| Federal ID | RI01501 |
| More Info | State Dam Safety Program |