Hadley Falls
Hadley Falls is a concrete dam located in Hillsborough, New Hampshire, built in 1922. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Hadley Falls
The primary purpose of Hadley Falls is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is state-owned. It impounds the Piscataquog River near Goffstown.
The dam stands 20 feet tall and stretches 230 feet across, creates a reservoir covering 24 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 197 square miles. Completed in 1922, the structure is over a century old.
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. The most recent inspection on record was 05/25/2022.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Goffstown |
| River/Stream | Piscataquog River |
| Coordinates | 43.01861, -71.59752 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 230 ft |
| Year Completed | 1922 (104 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 150 acre-ft |
| Surface Area | 24 acres |
| Drainage Area | 197 sq mi |
| Max Discharge | 6,620 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/25/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00020 |
| Federal ID | NH00020 |
| More Info | State Dam Safety Program |