New Wilton Reservoir Dam
New Wilton Reservoir Dam is a concrete dam located in Hillsborough, New Hampshire, built in 1931. It carries a High hazard potential classification and has a poor condition assessment.
About New Wilton Reservoir Dam
The primary purpose of New Wilton 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 Wilton (local government). It impounds the Stockwell Brook near Wilton.
The dam stands 24 feet tall and stretches 123 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 335 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1931, the structure is well-established, with more than 75 years 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. An emergency action plan is in place for this dam. The most recent inspection on record was 10/24/2023.
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 New Hampshire 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 | New Hampshire |
| County | Hillsborough |
| Nearest City | Wilton |
| River/Stream | Stockwell Brook |
| Coordinates | 42.84220, -71.77110 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 123 ft |
| Year Completed | 1931 (95 years old) |
Storage & Hydraulics
| NID Storage | 335 acre-ft |
| Max Storage | 335 acre-ft |
| Normal Storage | 240 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 127 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | TOWN OF WILTON |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 10/24/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00261 |
| Federal ID | NH00261 |
| More Info | State Dam Safety Program |