Regional Stormwater Detention Basin G Dam Reservoir Report
Last Updated: December 6, 2025
The Regional Stormwater Detention Basin G Dam, located in Montgomery, New Jersey, serves as a vital infrastructure for flood risk reduction in the area.
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Summary
Constructed in 1989, this earth dam stands at a height of 18 feet and has a length of 690 feet, providing storage capacity of 32 acre-feet. The dam plays a crucial role in managing stormwater runoff from the Van Horne Brook-TR, with a drainage area of 0.15 square miles and a maximum discharge capacity of 1141 cubic feet per second.
Owned and regulated by the local government, the dam is under the jurisdiction of the New Jersey Department of Environmental Protection (NJDEP) and undergoes regular inspections to ensure its structural integrity. With a significant hazard potential, the dam is deemed to be in satisfactory condition as of the last assessment in April 2019. Despite its age, the Regional Stormwater Detention Basin G Dam continues to effectively mitigate flood risks in Mercer County, New Jersey, demonstrating its importance in protecting the surrounding communities from potential water-related emergencies.
For water resource and climate enthusiasts, understanding the critical role of infrastructure like the Regional Stormwater Detention Basin G Dam is essential in safeguarding against the impacts of extreme weather events and climate change. By maintaining and monitoring these structures, local governments and regulatory agencies can better prepare for and respond to potential flooding events, ultimately contributing to the resilience of communities in the face of evolving environmental challenges.
Year Completed |
1989 |
Dam Length |
690 |
Dam Height |
18 |
River Or Stream |
Van Horne Brook-TR |
Primary Dam Type |
Earth |
Surface Area |
183 |
Drainage Area |
0.15 |
Nid Storage |
32 |
Hazard Potential |
Significant |
Nid Height |
18 |
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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