Jenny (Arms House) Pond Dam Reservoir Report
Last Updated: December 20, 2025
Jenny (Arms House) Pond Dam, located in Plymouth, Massachusetts, is a vital water resource managed by the local government for recreational purposes.
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Summary
This earth dam, with a height of 12 feet and a hydraulic height of 7 feet, creates a storage capacity of 77.5 acre-feet and covers a surface area of 0.01 square miles. The dam, built on TOWN BROOK, is regulated by the Department of Conservation and Recreation in Massachusetts and undergoes regular inspections to ensure its structural integrity.
Despite being classified as having a significant hazard potential, Jenny (Arms House) Pond Dam is currently assessed to be in fair condition as of the last inspection in December 2017. The risk assessment for the dam indicates a moderate risk level (3), prompting the need for ongoing risk management measures. The dam has an uncontrolled spillway and no outlet gates, adding to its unique design characteristics. With its historical significance and recreational value, Jenny (Arms House) Pond Dam remains a key feature in the local water resource infrastructure, serving both practical and leisure purposes for the community.
Dam Length |
160 |
Dam Height |
12 |
River Or Stream |
TOWN BROOK |
Primary Dam Type |
Earth |
Surface Area |
0.01 |
Hydraulic Height |
7 |
Drainage Area |
3.9 |
Nid Storage |
77.5 |
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.
Jenny (Arms House) Pond Dam