Mannington Water Supply Dam
Mannington Water Supply Dam is an earth dam located in Marion County, West Virginia, built in 1964. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Mannington Water Supply Dam
The primary purpose of Mannington Water Supply Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City Of Mannington (local government). It impounds the Dent's Run near Mannington.
The dam stands 56 feet tall and stretches 315 feet across, creates a reservoir covering 14 acres, and has a maximum storage capacity of 352 acre-feet. Completed in 1964, 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 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 09/30/2025.
At 56 feet, this dam is taller than 94% of dams nationwide.
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 West 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 | West Virginia |
| County | Marion |
| Nearest City | Mannington |
| River/Stream | Dent's Run |
| Coordinates | 39.53161, -80.36746 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 56 ft |
| Dam Height | 56 ft |
| Dam Length | 315 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 352 acre-ft |
| Max Storage | 352 acre-ft |
| Normal Storage | 228 acre-ft |
| Surface Area | 14 acres |
Ownership & Safety
| Purpose | Recreation |
| Owner | CITY OF MANNINGTON |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/30/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WV04921 |
| Federal ID | WV04921 |
| More Info | State Dam Safety Program |