Long Pond Dam Reservoir Report
Last Updated: December 20, 2025
Long Pond Dam, located in Easton, Massachusetts, is a significant earth dam that serves primarily for recreational purposes.
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Summary
The dam, standing at a height of 12 feet with a hydraulic height of 11 feet, holds a maximum storage capacity of 830 acre-feet and a normal storage capacity of 413 acre-feet. With a surface area of 94.7 acres and a drainage area of 2.54 square miles, Long Pond Dam plays a crucial role in managing water resources in the region.
Managed by the local government and regulated by the Department of Conservation and Recreation, Long Pond Dam has a hazard potential classified as "significant" and a condition assessment reported as "satisfactory." The dam boasts a controlled spillway type and has been inspected regularly, with the last assessment conducted in May 2017. Despite its satisfactory condition, the risk assessment for Long Pond Dam is classified as "very high (1)," indicating the need for continued monitoring and risk management measures to ensure the safety and integrity of the structure.
Water resource and climate enthusiasts would find Long Pond Dam to be an intriguing site for its recreational significance, hydraulic features, and risk management considerations. As a vital component of the region's water infrastructure, the dam presents both opportunities for leisure activities and challenges in maintaining its safety and functionality in the face of potential hazards. With its location along the Quaset Brook and under the jurisdiction of state regulatory agencies, Long Pond Dam serves as a focal point for monitoring and managing water resources in Bristol County, Massachusetts.
Dam Length |
900 |
Dam Height |
12 |
River Or Stream |
QUESET BROOK |
Primary Dam Type |
Earth |
Surface Area |
94.7 |
Hydraulic Height |
11 |
Drainage Area |
2.54 |
Nid Storage |
830 |
Hazard Potential |
Significant |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Camp Christina Entrance
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Missionary Point
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Ponkapoag Camp of Appalachian Mountain Club
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Spang Camp Site
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YMCA Camp
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Long Pond Dam
Beach Street Sharon