US Bridges

Va Route 123 over Gwmp

Fair

Fairfax County, Virginia · 3.8 Miles South of I-495. · Structure no. 3300004P0000000

Built
1959
66 years old, rebuilt 1985
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
169 ft
3 main spans
Daily traffic
2,500
2013 count
Owner
Federal
National Park Service

About this bridge

Va Route 123 over Gwmp is a prestressed concrete stringer/multi-beam or girder carrying Va Route 123 over Gwmp in Fairfax County, Virginia. It was built in 1959 and reconstructed in 1985, so it is 66 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 2,500 vehicles a day, roughly 1% of them trucks, projected to reach 2,750 by 2033. The structure is 169 ft (51.6 m) long and 87 ft wide.

Location

Open in Google Maps
CarriesVa Route 123
CrossesGwmp
Location3.8 Miles South of I-495.
RouteFederal Lands Road 123
CountyFairfax County
StateVirginia
Coordinates38.93911, -77.13375
Functional classUrban Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length169 ft (51.6 m)
Longest span112 ft (34.1 m)
Deck width87 ft (26.6 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2013)
Projected traffic2,750 by 2033
Trucks1%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerNational Park Service
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$788,000 (2021 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Va Route 123 over Gwmp built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1985.

What condition is Va Route 123 over Gwmp 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 April 2023.

How much traffic does Va Route 123 over Gwmp carry?

About 2,500 vehicles per day (2013 count), of which roughly 1% are trucks.

How long is Va Route 123 over Gwmp?

The structure is 169 ft (51.6 m) long with a longest span of 112 ft (34.1 m) and a deck 87 ft wide.

Who owns Va Route 123 over Gwmp?

It is owned by the National Park Service and maintained by the State Highway Agency.