Dulles Airport Dam is an earth dam located in Loudoun County, Virginia. It carries a Significant hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 650 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Dulles Airport Dam
The primary purpose of Dulles Airport 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 Metro-washington Airport Authority (public utility). It impounds the Tr-horsepen Run.
The dam stands 11 feet tall and stretches 650 feet across, creates a reservoir covering 28 acres, has a maximum storage capacity of 259 acre-feet, and collects water from a drainage area of 1 square miles.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam.
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Location
| State | Virginia |
| County | Loudoun |
| River/Stream | Tr-horsepen Run |
| Coordinates | 38.96300, -77.44470 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 650 ft |
Storage & Hydraulics
| NID Storage | 259 acre-ft |
| Max Storage | 259 acre-ft |
| Normal Storage | 102 acre-ft |
| Surface Area | 28 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Metro-washington Airport Authority |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | VA107008 |
| Federal ID | VA107008 |
| More Info | State Dam Safety Program |