Souhegan River Site 13 Dam Reservoir Report
Nearby: Souhegan Site 14 Dam Waterloom Falls
Last Updated: December 16, 2025
The Souhegan River Site 13 Dam, also known as Hibridge Dam, is situated in New Ipswich, New Hampshire, and serves as a crucial structure for flood risk reduction along the Souhegan River.
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Summary
Built in 1964 by the USDA NRCS, this earth dam stands at a height of 13.5 feet and has a length of 1120 feet, offering a maximum storage capacity of 278 acre-feet. With a low hazard potential and a satisfactory condition assessment as of November 2017, this dam plays a vital role in mitigating flood risks in the area.
Managed by the New Hampshire Department of Environmental Services Dam Bureau, the Souhegan River Site 13 Dam is equipped with an uncontrolled spillway and has a drainage area of 0.8 square miles. While the dam has not undergone any modifications in recent years, it is subject to regular state inspections and enforcement to ensure its safety and functionality. With a moderate risk assessment rating, this dam poses a manageable level of risk, and its emergency action plan is in place to address any potential threats effectively.
Overall, the Souhegan River Site 13 Dam serves as a crucial infrastructure for flood control in Hillsborough County, New Hampshire. With its primary purpose being flood risk reduction, this dam stands as a testament to the proactive measures taken by state agencies to safeguard communities and natural resources from the impacts of extreme weather events and climate change. As water resource and climate enthusiasts, it is essential to recognize the importance of such structures in ensuring the resilience and sustainability of our water systems in the face of evolving environmental challenges.
Year Completed |
1964 |
Dam Length |
1120 |
Dam Height |
13.5 |
River Or Stream |
TR SOUHEGAN RIVER |
Primary Dam Type |
Earth |
Surface Area |
10 |
Drainage Area |
0.8 |
Nid Storage |
278 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
14 |
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.
Souhegan River Site 13 Dam
Cunningham Pond boat launch