Warner Gap Hollow Dam
Warner Gap Hollow Dam is an earth dam located in Washington County, Maryland, built in 1902. It carries a High hazard potential classification and has a unsatisfactory condition assessment.
About Warner Gap Hollow Dam
The primary purpose of Warner Gap Hollow Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Hagerstown (local government). It impounds the Warner Gap Hollow Creek near Greensburg Sch..
The dam stands 65 feet tall and stretches 700 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 296 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1902, the structure is over a century 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 unsatisfactory, indicating serious safety deficiencies exist that require immediate attention or remedial action. An emergency action plan is in place for this dam. The most recent inspection on record was 09/12/2024.
At 65 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 Maryland 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 | Maryland |
| County | Washington |
| Nearest City | Greensburg Sch. |
| River/Stream | Warner Gap Hollow Creek |
| Coordinates | 39.66330, -77.55000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 65 ft |
| Dam Height | 65 ft |
| Dam Length | 700 ft |
| Year Completed | 1902 (124 years old) |
Storage & Hydraulics
| NID Storage | 296 acre-ft |
| Max Storage | 296 acre-ft |
| Normal Storage | 246 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 6,800 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Hagerstown |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Unsatisfactory |
| Last Inspection | 09/12/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MD00006 |
| Federal ID | MD00006 |
| More Info | State Dam Safety Program |