Rollinsford Reservoir Report
Nearby: South Berwick South Berwick
Last Updated: December 19, 2025
Rollinsford, also known as Salmon Falls River Dam No.2, is a significant hydroelectric structure located in Strafford, New Hampshire.
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Summary
Managed by the local government and regulated by the NHDES Dam Bureau, this concrete dam was completed in 1910 and stands at a height of 20 feet with a length of 385 feet. With a storage capacity of 456 acre-feet and a drainage area of 230 square miles, Rollinsford plays a crucial role in fire protection, stock, small fish pond, fish and wildlife pond, hydroelectric, and recreational purposes along the Salmon Falls River.
The dam, owned and operated by the Federal Energy Regulatory Commission (FERC), features an uncontrolled spillway with a width of 350 feet and a maximum discharge capacity of 7000 cubic feet per second. Despite its significant hazard potential, the dam's risk assessment is moderate (3), indicating the need for ongoing monitoring and management measures. The last inspection in 2018 revealed a condition assessment of "Not Available," highlighting the importance of regular evaluations to ensure the safety and functionality of this essential water resource infrastructure in Rollinsford.
Rollinsford's role in water resource management and climate resilience is underscored by its strategic location and multi-purpose functionality. With its historical significance and hydroelectric capabilities, the dam serves as a vital asset for the community and the environment. As efforts continue to assess and mitigate potential risks, Rollinsford remains a key player in safeguarding the Salmon Falls River and supporting various water-related activities in the region.
Year Completed |
1910 |
Dam Length |
385 |
Dam Height |
20 |
River Or Stream |
Salmon Falls River |
Primary Dam Type |
Concrete |
Surface Area |
57 |
Drainage Area |
230 |
Nid Storage |
456 |
Hazard Potential |
Significant |
Nid Height |
20 |
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.
Rollinsford
Salmon Falls River boat launch