US Bridges

Gwmp over Dead Run

Fair

Fairfax County, Virginia · 0.5 Miles South of I-495. · Structure no. 3300001P0000000

Built
1963
62 years old, rebuilt 1998
Condition
Fair
inspected April 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
308 ft
3 main spans
Daily traffic
24,399
2022 count
Owner
Federal
National Park Service

About this bridge

Gwmp over Dead Run is a steel continuous girder and floorbeam system carrying Gwmp over Dead Run in Fairfax County, Virginia. It was built in 1963 and reconstructed in 1998, so it is 62 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 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 24,399 vehicles a day, roughly 1% of them trucks, projected to reach 29,279 by 2042. The structure is 308 ft (93.8 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesGwmp
CrossesDead Run
Location0.5 Miles South of I-495.
RouteFederal Lands Road 1
CountyFairfax County
StateVirginia
Coordinates38.96433, -77.17361
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating22 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length308 ft (93.8 m)
Longest span113 ft (34.4 m)
Deck width73 ft (22.3 m)
Roadway width60 ft (18.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,399 (2022)
Projected traffic29,279 by 2042
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Gwmp over Dead Run built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1998.

What condition is Gwmp over Dead 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 April 2023.

How much traffic does Gwmp over Dead Run carry?

About 24,399 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Gwmp over Dead Run?

The structure is 308 ft (93.8 m) long with a longest span of 113 ft (34.4 m) and a deck 73 ft wide.

Who owns Gwmp over Dead Run?

It is owned by the National Park Service.