Sugar River Ii Reservoir Report
Last Updated: December 14, 2025
Sugar River II is a private hydroelectric dam situated in Newport, New Hampshire, along the Sugar River.
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Summary
Completed in 2009, this dam stands 10 feet tall and extends 90.5 feet in length, with a storage capacity of 11 acre-feet. With a maximum discharge of 2000 cubic feet per second, it serves as a critical source of renewable energy in the region.
Managed by the Federal Energy Regulatory Commission, Sugar River II has a spillway width of 23 feet and features two other controlled outlet gates for operational flexibility. The dam has a significant hazard potential and a moderate risk assessment rating. While its condition assessment is not available, regular inspections are conducted to ensure its safety and functionality, underscoring the importance of maintaining such water resource infrastructure for both energy generation and climate resilience efforts in the area.
Overall, Sugar River II represents a vital component of New Hampshire's hydroelectric infrastructure, playing a key role in the local energy landscape. As climate change continues to impact water resources, the sustainable operation of dams like Sugar River II is essential for meeting the region's energy needs while adapting to a changing climate. With its strategic location on the Sugar River and regulated by federal authorities, the dam serves as a model for combining renewable energy generation with effective water resource management practices in the face of evolving environmental challenges.
Year Completed |
2009 |
Dam Length |
90.5 |
Dam Height |
10 |
River Or Stream |
Sugar River |
Surface Area |
1.4 |
Drainage Area |
74 |
Nid Storage |
11 |
Outlet Gates |
Other Controlled - 2, Slide (sluice gate) - 1 |
Hazard Potential |
Significant |
Nid Height |
10 |
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.
Sugar River Ii
Perkins Pond boat launch