Big Lebanon Lake Dam Reservoir Report
Last Updated: December 5, 2025
Big Lebanon Lake Dam, located in Turnersville, New Jersey, stands as a significant earth dam completed in 1941 with a primary purpose of recreation.
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Summary
Situated along the Timber Creek South Branch, this dam boasts a height of 13 feet and a length of 260 feet, providing a storage capacity of 51 acre-feet and covering a surface area of 8 acres. Despite its historical significance, the dam's condition assessment is rated as poor, signaling a need for maintenance and improvements to ensure its continued safety and functionality.
Owned privately, Big Lebanon Lake Dam is regulated by the New Jersey Department of Environmental Protection, with state permitting, inspection, and enforcement processes in place. The dam's hazard potential is classified as significant, emphasizing the importance of proactive risk management measures and emergency action preparedness. With a designated inspection frequency of every two years, the dam's last assessment in April 2019 highlighted its deteriorating condition, calling for attention to prevent potential safety hazards and ensure the protection of the surrounding community and environment.
As a key feature of the Gloucester Township landscape, Big Lebanon Lake Dam serves as a recreational hub for locals and visitors alike. However, with its aging infrastructure and poor condition assessment, stakeholders must prioritize maintenance and rehabilitation efforts to uphold the dam's structural integrity and safety standards. With ongoing monitoring and compliance with regulatory guidelines, the future of Big Lebanon Lake Dam can be secured for generations to come, preserving its role as a vital water resource in the region.
Year Completed |
1941 |
Dam Length |
260 |
Dam Height |
13 |
River Or Stream |
Timber Creek South Branch |
Primary Dam Type |
Earth |
Surface Area |
8 |
Drainage Area |
5.7 |
Nid Storage |
51 |
Hazard Potential |
Significant |
Nid Height |
13 |
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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