Greenbrier State Park Dam & Dike
Greenbrier State Park Dam & Dike is an earth dam located in Washington County, Maryland, built in 1965. It carries a High hazard potential classification and has a unsatisfactory condition assessment.
About Greenbrier State Park Dam & Dike
The primary purpose of Greenbrier State Park Dam & Dike is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Md Dnr-public Lands, Engineering & Constr-western (state). It impounds the Little Beaver Creek-tr near Mount Lena/greenbriar.
The dam stands 64 feet tall and stretches 445 feet across, creates a reservoir covering 27 acres, has a maximum storage capacity of 734 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, 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 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 12/17/2024.
At 64 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 | Mount Lena/greenbriar |
| River/Stream | Little Beaver Creek-tr |
| Coordinates | 39.53890, -77.62130 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 64 ft |
| Dam Height | 64 ft |
| Dam Length | 445 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 734 acre-ft |
| Max Storage | 734 acre-ft |
| Normal Storage | 414 acre-ft |
| Surface Area | 27 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 14,168 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MD DNR-Public Lands, Engineering & Constr-Western |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Unsatisfactory |
| Last Inspection | 12/17/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MD00042 |
| Federal ID | MD00042 |
| More Info | State Dam Safety Program |