Merrimack River Right Bank Fdr Reservoir Report
Nearby: Salmon Brook Dam Jackson Mills
Last Updated: December 17, 2025
The Merrimack River Right Bank Flood Control Levee, also known as the Nashua Flood Control Levee, is a vital structure located in Nashua, New Hampshire.
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Summary
Constructed in 1949, this earth dam stands at 15 feet high and stretches for 3025 feet along the Merrimack River. Its primary purpose is flood risk reduction, serving as a crucial line of defense against potential flooding in the area.
Managed by the NHDES Dam Bureau, this levee is state-regulated and undergoes regular inspections to ensure its structural integrity. With a high hazard potential and fair condition assessment, the levee plays a critical role in protecting the surrounding community from flood risks. Despite its moderate risk assessment, the structure meets guidelines and is equipped with emergency protocols to effectively manage any potential risks that may arise.
The Merrimack River Right Bank Flood Control Levee stands as a testament to the importance of water resource management and climate resilience efforts. As climate change continues to impact weather patterns and increase the frequency of extreme events, structures like this levee are essential in safeguarding communities and infrastructure from the devastating effects of flooding.
Year Completed |
1949 |
Dam Length |
3025 |
Dam Height |
15 |
River Or Stream |
MERRIMACK |
Primary Dam Type |
Earth |
Drainage Area |
4000 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
15 |
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.
Merrimack River Right Bank Fdr
Claveau Landing