Webster
Webster is a concrete dam located in Merrimack County, New Hampshire, built in 1917. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Webster
The primary purpose of Webster is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Pembroke Hydro Associates (private). It impounds the Suncook River near Pembroke.
The dam stands 22 feet tall and stretches 250 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 147 acre-feet, and collects water from a drainage area of 259 square miles. Completed in 1917, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/25/2022.
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Location
| State | New Hampshire |
| County | Merrimack |
| Nearest City | Pembroke |
| River/Stream | Suncook River |
| Coordinates | 43.12952, -71.45042 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 250 ft |
| Year Completed | 1917 (109 years old) |
Storage & Hydraulics
| NID Storage | 147 acre-ft |
| Max Storage | 147 acre-ft |
| Normal Storage | 147 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 259 sq mi |
| Max Discharge | 11,010 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Pembroke Hydro Associates |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/25/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00378 |
| Federal ID | NH00378 |
| More Info | State Dam Safety Program |