Almy Reservoir
Almy Reservoir is a rockfill dam located in Providence County, Rhode Island, built in 1865. It carries a High hazard potential classification and has a poor condition assessment.
About Almy Reservoir
Almy Reservoir is a dam in Providence, Rhode Island. The dam is owned by Johnston, Town Of (local government). It impounds the Dry Brook near Johnston.
The dam stands 33 feet tall and stretches 950 feet across, creates a reservoir covering 56 acres, has a maximum storage capacity of 1,030 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1865, the structure is one of the older dams in the region, with over a century and a half of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. Notably, no emergency action plan is currently on file for this high-hazard dam.
At 33 feet, this dam is taller than 78% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Rhode Island dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Rhode Island |
| County | Providence |
| Nearest City | Johnston |
| River/Stream | Dry Brook |
| Coordinates | 41.81469, -71.52054 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 950 ft |
| Year Completed | 1865 (161 years old) |
Storage & Hydraulics
| NID Storage | 1,030 acre-ft |
| Max Storage | 1,030 acre-ft |
| Normal Storage | 694 acre-ft |
| Surface Area | 56 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 2,700 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | JOHNSTON, TOWN OF |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Emergency Action Plan | No |
Identifiers
| NID ID | RI01606 |
| Federal ID | RI01606 |
| More Info | State Dam Safety Program |