Triphammer Pond Dam Reservoir Report
Last Updated: December 19, 2025
Triphammer Pond Dam, located in Hingham, Massachusetts, serves a primary purpose of recreation and was completed in 1940.
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Summary
The dam, a 5.3 feet high earth structure with a hydraulic height of 10 feet, is situated on a tributary of Weir River and is regulated by the Department of Conservation and Recreation. With a storage capacity of 75 acre-feet and a low hazard potential, the dam's condition was assessed as fair during the last inspection in September 2009.
Although Triphammer Pond Dam has a moderate risk assessment rating of 3, its hazard potential remains low. The dam has not undergone any modifications in recent years and does not currently have an Emergency Action Plan (EAP) in place. Despite the absence of inundation maps and updated emergency contacts, the dam's risk management measures have not been specified. The structure's overall risk character summary and DSAC assignment date are also pending further details, indicating a need for more comprehensive risk assessment and management protocols in the future.
For water resource and climate enthusiasts, Triphammer Pond Dam offers a valuable case study in dam safety and regulation within Massachusetts. This local government-owned earth dam provides recreational opportunities while being subject to state jurisdiction, regulation, inspection, and enforcement. As the dam's risk assessment suggests a moderate level of potential issues, further attention and action may be necessary to ensure the structural integrity and safety of the Triphammer Pond Dam for both the community and the surrounding environment.
Year Completed |
1940 |
Dam Length |
450 |
Dam Height |
5.3 |
River Or Stream |
TRIBUTARY OF WEIR RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
10 |
Drainage Area |
5.4 |
Nid Storage |
75 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
10 |
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 |
|---|---|---|
Ponkapoag Camp of Appalachian Mountain Club
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Spang Camp Site
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Missionary Point
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YMCA Camp
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Triphammer Pond Dam
Ship Street Hingham