Neponset Reservoir Dam
Neponset Reservoir Dam is an earth dam located in Norfolk County, Massachusetts, built in 1850. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Neponset Reservoir Dam
The primary purpose of Neponset Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Town Of Foxborough (local government). It impounds the Neponset River near Foxborough.
The dam stands 10 feet tall and stretches 275 feet across, creates a reservoir covering 315 acres, has a maximum storage capacity of 2,500 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1850, the structure is one of the older dams in the region, with over a century and a half 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 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 01/27/2023.
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Location
| State | Massachusetts |
| County | Norfolk |
| Nearest City | Foxborough |
| River/Stream | Neponset River |
| Coordinates | 42.08231, -71.25201 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Length | 275 ft |
| Year Completed | 1850 (176 years old) |
Storage & Hydraulics
| NID Storage | 2,500 acre-ft |
| Max Storage | 2,500 acre-ft |
| Normal Storage | 1,500 acre-ft |
| Surface Area | 315 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 460 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Foxborough |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/27/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA03115 |
| Federal ID | MA03115 |
| More Info | State Dam Safety Program |