Regional Stormwater Detention Basin G Dam
Regional Stormwater Detention Basin G Dam is an earth dam located in Mercer County, New Jersey, built in 1989. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Regional Stormwater Detention Basin G Dam
The primary purpose of Regional Stormwater Detention Basin G Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Princeton (local government). It impounds the Van Horne Brook-tr near Montgomery.
The dam stands 18 feet tall and stretches 690 feet across, creates a reservoir covering 183 acres, has a maximum storage capacity of 32 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1989, the structure is 37 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 01/27/2025.
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Location
| State | New Jersey |
| County | Mercer |
| Nearest City | Montgomery |
| River/Stream | Van Horne Brook-tr |
| Coordinates | 40.38540, -74.66223 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 690 ft |
| Year Completed | 1989 (37 years old) |
Storage & Hydraulics
| NID Storage | 32 acre-ft |
| Max Storage | 32 acre-ft |
| Normal Storage | 10 acre-ft |
| Surface Area | 183 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1,141 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Princeton |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/27/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00952 |
| Federal ID | NJ00952 |
| More Info | State Dam Safety Program |