US Bridges

EB Diaah over Horsepen Run

Fair

Loudoun County, Virginia · 1.3 Miles from Dulles Air · Structure no. 2100004P0000000

Built
1960
65 years old, rebuilt 1985
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
135 ft
3 main spans
Daily traffic
13,000
2024 count
Owner
Federal
Metropolitan Washington Airports Service

About this bridge

EB Diaah over Horsepen Run is a steel stringer/multi-beam or girder carrying EB Diaah over Horsepen Run in Loudoun County, Virginia. It was built in 1960 and reconstructed in 1985, so it is 65 years old, older than the Virginia average of 50.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 13,000 vehicles a day, roughly 12% of them trucks, projected to reach 14,300 by 2044. The structure is 135 ft (41.2 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesEB Diaah
CrossesHorsepen Run
Location1.3 Miles from Dulles Air
Coordinates38.96258, -77.43094
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating37 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length135 ft (41.2 m)
Longest span60 ft (18.3 m)
Deck width59 ft (18 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2024)
Projected traffic14,300 by 2044
Trucks12%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerMetropolitan Washington Airports Service
Maintained byMetropolitan Washington Airports Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$398,000 (2021 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was EB Diaah over Horsepen Run built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1985.

What condition is EB Diaah over Horsepen Run in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2024.

How much traffic does EB Diaah over Horsepen Run carry?

About 13,000 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is EB Diaah over Horsepen Run?

The structure is 135 ft (41.2 m) long with a longest span of 60 ft (18.3 m) and a deck 59 ft wide.

Who owns EB Diaah over Horsepen Run?

It is owned by the Metropolitan Washington Airports Service.