Rocky Branch Regional Swm Dam
Rocky Branch Regional Swm Dam is an earth dam located in Prince William County, Virginia. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Rocky Branch Regional Swm Dam
The primary purpose of Rocky Branch Regional Swm 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 Virginia Gateway Owners Association. It impounds the Rocky Branch.
The dam stands 22 feet tall and stretches 935 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 375 acre-feet, and collects water from a drainage area of 1 square miles.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 06/25/2022.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Virginia dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Virginia |
| County | Prince William |
| River/Stream | Rocky Branch |
| Coordinates | 38.78430, -77.60560 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 935 ft |
Storage & Hydraulics
| NID Storage | 375 acre-ft |
| Max Storage | 375 acre-ft |
| Normal Storage | 4 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Virginia Gateway Owners Association |
| Owner Type | Not Listed |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/25/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | VA153025 |
| Federal ID | VA153025 |
| More Info | State Dam Safety Program |