Hoppin Hill Reservoir Dam
Hoppin Hill Reservoir Dam is an earth dam located in Bristol County, Massachusetts, built in 1910. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Hoppin Hill Reservoir Dam
The primary purpose of Hoppin Hill Reservoir Dam 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 City Of Attleboro (local government). It impounds the Seven Mile River near N. Attleborough.
The dam stands 27 feet tall and stretches 1,000 feet across, creates a reservoir covering 38 acres, has a maximum storage capacity of 441 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1910, the structure is over a century old.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 12/28/2022.
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 Massachusetts 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 | Massachusetts |
| County | Bristol |
| Nearest City | N. Attleborough |
| River/Stream | Seven Mile River |
| Coordinates | 41.96193, -71.34474 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1910 (116 years old) |
Storage & Hydraulics
| NID Storage | 441 acre-ft |
| Max Storage | 441 acre-ft |
| Normal Storage | 244 acre-ft |
| Surface Area | 38 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 450 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Attleboro |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/28/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00858 |
| Federal ID | MA00858 |
| More Info | State Dam Safety Program |