US Bridges

WB Diaah Entrance over Horsepen Run

Fair

Loudoun County, Virginia · 1.3 Miles from Dulles Air · Structure no. 2100030P0000000

Built
1997
28 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
163 ft
3 main spans
Daily traffic
13,000
2024 count
Owner
Federal
Metropolitan Washington Airports Service

About this bridge

WB Diaah Entrance over Horsepen Run is a steel continuous stringer/multi-beam or girder carrying WB Diaah Entrance over Horsepen Run in Loudoun County, Virginia. It was built in 1997, so it is 28 years old, younger 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 6 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 163 ft (49.6 m) long and 43 ft wide.

CarriesWB Diaah Entrance
CrossesHorsepen Run
Location1.3 Miles from Dulles Air
Coordinates38.9635, -77.43092
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length163 ft (49.6 m)
Longest span67 ft (20.3 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2024)
Projected traffic14,300 by 2044
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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$62,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was WB Diaah Entrance over Horsepen Run built?

It was built in 1997, making it 28 years old in 2025.

What condition is WB Diaah Entrance 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 WB Diaah Entrance over Horsepen Run carry?

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

How long is WB Diaah Entrance over Horsepen Run?

The structure is 163 ft (49.6 m) long with a longest span of 67 ft (20.3 m) and a deck 43 ft wide.

Who owns WB Diaah Entrance over Horsepen Run?

It is owned by the Metropolitan Washington Airports Service.