Sand Pond Dam Reservoir Report
Nearby: Long Pond Dam Ashuelot Pond Dam
Last Updated: December 14, 2025
Sand Pond Dam in Marlow, New Hampshire, is a privately owned structure regulated by the NHDES Dam Bureau.
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Summary
Completed in 1925, this earth dam stands at 12 feet high and spans 250 feet, serving primarily for recreational purposes along the Ashuelot River. With a storage capacity of 1018 acre-feet and a surface area of 161 acres, the dam's hazard potential is rated as low, with a fair condition assessment.
Despite its low hazard potential, the dam's risk assessment is moderate, indicating a need for continued monitoring and maintenance. The last inspection in June 2018 revealed a fair condition, with a recommended inspection frequency of every 6 years. The dam lacks Emergency Action Plan (EAP) preparation and updated contact information, highlighting areas for improvement in emergency response readiness.
Water resource and climate enthusiasts can appreciate Sand Pond Dam as a vital component of the recreational landscape in Cheshire County. Its historical significance, coupled with its role in water storage and leisure activities, underscores the importance of ongoing monitoring and risk management to ensure the safety and sustainability of this essential infrastructure.
Year Completed |
1925 |
Dam Length |
250 |
Dam Height |
12 |
River Or Stream |
TR ASHUELOT RIVER |
Primary Dam Type |
Earth |
Surface Area |
161 |
Drainage Area |
1.22 |
Nid Storage |
1018 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
12 |
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.
Sand Pond Dam
Sand Pond boat launch