Manchester Airport Det Pond Dam Reservoir Report
Last Updated: December 16, 2025
Manchester Airport Det Pond Dam is a crucial structure located in Londonderry, New Hampshire, dedicated to flood risk reduction.
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Summary
Built in 1992, this earth dam stands at a height of 27 feet and stretches 400 feet in length. With a storage capacity of 30.4 acre-feet, it serves as a vital barrier to protect the surrounding area from potential flooding events.
Managed by the NHDES Dam Bureau and regulated by the state, Manchester Airport Det Pond Dam has a low hazard potential and a moderate risk assessment rating. Although its condition is currently not rated, regular inspections are conducted every 6 years to ensure its structural integrity. The spillway, with a width of 8 feet, is uncontrolled, allowing for a maximum discharge of 130 cubic feet per second in case of overflow.
Situated along a runoff stream in Rockingham County, this dam plays a crucial role in mitigating flood risks and protecting the local community. With its strategic location and effective design, Manchester Airport Det Pond Dam stands as a testament to effective water resource management in the face of changing climate patterns.
Year Completed |
1992 |
Dam Length |
400 |
Dam Height |
27 |
River Or Stream |
RUNOFF |
Primary Dam Type |
Earth |
Drainage Area |
0.14 |
Nid Storage |
30.4 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
27 |
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.
Manchester Airport Det Pond Dam
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