Pembroke Reservoir Report
Nearby: China Mill Dam Webster
Last Updated: December 18, 2025
Pembroke is a historic masonry dam located on the Suncook River in New Hampshire, with a primary purpose of hydroelectric power generation.
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Summary
Built in 1891, this structure stands at 26 feet in height and spans 108 feet in length, with a storage capacity of 34 acre-feet. The dam, regulated by the NHDES Dam Bureau and inspected by the Federal Energy Regulatory Commission, serves as a key component in the state's water resource management system.
Despite its low hazard potential, Pembroke poses a moderate risk level due to its age and condition assessment not being available. The dam has an uncontrolled spillway with a width of 77 feet, capable of handling a maximum discharge of 1848 cfs. While emergency measures such as an Emergency Action Plan are not currently prepared, the structure is subject to regular inspections every 3 years to ensure its safety and integrity.
As a significant feature on the Suncook River, Pembroke highlights the intersection of historical infrastructure with modern-day water resource management practices. With its role in hydroelectric power generation and state regulation, this dam serves as a reminder of the importance of maintaining and monitoring our water resources in the face of changing climate conditions and evolving regulatory standards.
Year Completed |
1891 |
Dam Length |
108 |
Dam Height |
26 |
River Or Stream |
Suncook River |
Primary Dam Type |
Masonry |
Surface Area |
1 |
Drainage Area |
259 |
Nid Storage |
34 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Pembroke
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