Lake Plymouth Dam Reservoir Report
Last Updated: December 13, 2025
Lake Plymouth Dam, located in Newton, New Jersey, is a privately owned structure with a primary purpose of recreation.
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Summary
Completed in 1951, this earth and gravity dam stands at a height of 13.6 feet, holding a storage capacity of 99 acre-feet and covering a surface area of 15 acres. The dam is situated on Truot Brook, within the jurisdiction of the New Jersey Department of Environmental Protection (NJDEP), and is regulated, permitted, inspected, and enforced by the state.
Despite its significance for recreation, Lake Plymouth Dam poses a significant hazard due to its poor condition, as assessed during the last inspection in March 2021. With an inspection frequency of every two years, the dam's emergency action plan (EAP) status remains unclear, highlighting potential risks associated with its operation. While there are no specific risk management measures or inundation maps prepared for the dam, its condition and hazard potential underscore the importance of ongoing monitoring and maintenance to ensure the safety of the surrounding community and downstream areas in Stillwater Township.
As water resource and climate enthusiasts delve into the details of Lake Plymouth Dam, they can appreciate the unique blend of historical significance and recreational value that this structure offers. With its picturesque location and vital role in water storage and management, the dam serves as a reminder of the ongoing need for proactive risk assessment and maintenance to safeguard both the environment and local communities from potential hazards. As discussions on climate resilience and water infrastructure continue, Lake Plymouth Dam stands as a noteworthy example of the intersection between human intervention and natural resources in the context of water management and climate adaptation.
Year Completed |
1951 |
Dam Length |
495 |
Dam Height |
13.6 |
River Or Stream |
Truot Brook |
Primary Dam Type |
Earth |
Surface Area |
15 |
Drainage Area |
1.2 |
Nid Storage |
99 |
Hazard Potential |
Significant |
Nid Height |
14 |
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.
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