Marchs Pond Dam
Marchs Pond Dam is an earth dam located in Strafford County, New Hampshire, built in 1840. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Marchs Pond Dam
The primary purpose of Marchs Pond 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 New Durham (local government). It impounds the Hayes Brook near New Durham.
The dam stands 8 feet tall and stretches 3,500 feet across, creates a reservoir covering 114 acres, has a maximum storage capacity of 840 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1840, 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 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 09/29/2021.
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 | Strafford |
| Nearest City | New Durham |
| River/Stream | Hayes Brook |
| Coordinates | 43.46440, -71.13250 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 3,500 ft |
| Year Completed | 1840 (186 years old) |
Storage & Hydraulics
| NID Storage | 840 acre-ft |
| Max Storage | 840 acre-ft |
| Normal Storage | 365 acre-ft |
| Surface Area | 114 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 727 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | TOWN OF NEW DURHAM |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/29/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00350 |
| Federal ID | NH00350 |
| More Info | State Dam Safety Program |