Nashua Canal Dike Reservoir Report
Nearby: Mine Falls Nashua Canal Dam
Last Updated: December 17, 2025
The Nashua Canal Dike, located in Nashua, New Hampshire, was completed in 1886 and serves primarily for recreational purposes.
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Summary
This Earth dam, with a height of 25 feet and a length of 14,260 feet, helps regulate the flow of the Nashua Canal and provides storage for 420 acre-feet of water. The dike has a spillway width of 44 feet and a maximum discharge capacity of 2,680 cubic feet per second, making it an essential structure for managing water levels in the area.
Managed by the NHDES Dam Bureau, the Nashua Canal Dike is inspected regularly with a frequency of 10 years. Its hazard potential is currently listed as "Undetermined", and its condition is noted as "Not Rated". Despite these assessments, the risk assessment for the dam is considered moderate, signifying the importance of ongoing monitoring and maintenance efforts. With its historical significance and critical role in water management, the Nashua Canal Dike stands as a testament to the importance of sustainable infrastructure in the face of changing climate conditions.
Year Completed |
1886 |
Dam Length |
14260 |
Dam Height |
25 |
River Or Stream |
NASHUA CANAL |
Primary Dam Type |
Earth |
Surface Area |
42 |
Drainage Area |
1.1 |
Nid Storage |
420 |
Hazard Potential |
Undetermined |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
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.
Nashua Canal Dike
Winchester Street boat launch