US Bridges

Road "a" Extension over Diaah and Metrorail

Fair

Loudoun County, Virginia · 0.75 Miles to Va Route 28 · Structure no. 2100024P0000000

Built
1989
36 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
396 ft
3 main spans
Daily traffic
12,000
2024 count
Owner
Federal
Metropolitan Washington Airports Service

About this bridge

Road "a" Extension over Diaah and Metrorail is a steel continuous stringer/multi-beam or girder carrying Road "a" Extension over Diaah and Metrorail in Loudoun County, Virginia. It was built in 1989, so it is 36 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 12,000 vehicles a day, projected to reach 15,000 by 2044. The structure is 396 ft (120.7 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesRoad "a" Extension
CrossesDiaah and Metrorail
Location0.75 Miles to Va Route 28
CountyLoudoun County
StateVirginia
Coordinates38.96153, -77.44128
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length396 ft (120.7 m)
Longest span140 ft (42.7 m)
Deck width56 ft (17 m)
Roadway width50 ft (15.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,000 (2024)
Projected traffic15,000 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
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$120,000 (2021 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Road "a" Extension over Diaah and Metrorail built?

It was built in 1989, making it 36 years old in 2025.

What condition is Road "a" Extension over Diaah and Metrorail 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 Road "a" Extension over Diaah and Metrorail carry?

About 12,000 vehicles per day (2024 count).

How long is Road "a" Extension over Diaah and Metrorail?

The structure is 396 ft (120.7 m) long with a longest span of 140 ft (42.7 m) and a deck 56 ft wide.

Who owns Road "a" Extension over Diaah and Metrorail?

It is owned by the Metropolitan Washington Airports Service.