Roxboro Afterbay Dam
Roxboro Afterbay Dam is a concrete dam located in Person County, North Carolina, built in 1974. It carries a High hazard potential classification and has a fair condition assessment.
About Roxboro Afterbay Dam
Roxboro Afterbay Dam is a dam in Person, North Carolina. The dam is owned by Duke Energy Corporation (public utility). It impounds the Hyco River near Denniston.
The dam stands 68 feet tall and stretches 909 feet across, creates a reservoir covering 650 acres, has a maximum storage capacity of 27,000 acre-feet, and collects water from a drainage area of 202 square miles. Completed in 1974, the structure is well into its service life at over 50 years old.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 04/17/2024.
At 68 feet, this dam is taller than 96% of all dams in the United States.
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 North Carolina 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 | North Carolina |
| County | Person |
| Nearest City | Denniston |
| River/Stream | Hyco River |
| Coordinates | 36.52230, -78.99720 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 68 ft |
| Dam Length | 909 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 27,000 acre-ft |
| Max Storage | 27,000 acre-ft |
| Normal Storage | 12,000 acre-ft |
| Surface Area | 650 acres |
| Drainage Area | 202 sq mi |
| Max Discharge | 330 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Duke Energy Corporation |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 04/17/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NC00666 |
| Federal ID | NC00666 |
| More Info | State Dam Safety Program |