US Bridges

Gwmp over Four Mile Run

Fair

Arlington County, Virginia · 2.3 Miles South of I-395. · Structure no. 3300022P0000000

Built
1977
48 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
336 ft
3 main spans
Daily traffic
17,745
2022 count
Owner
Federal
National Park Service

About this bridge

Gwmp over Four Mile Run is a steel continuous stringer/multi-beam or girder carrying Gwmp over Four Mile Run in Arlington County, Virginia. It was built in 1977, so it is 48 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 17,745 vehicles a day, roughly 1% of them trucks, projected to reach 21,294 by 2042. The structure is 336 ft (102.5 m) long and 93 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesGwmp
CrossesFour Mile Run
Location2.3 Miles South of I-395.
RouteFederal Lands Road 1
CountyArlington County
StateVirginia
Coordinates38.84128, -77.04744
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating22 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length336 ft (102.5 m)
Longest span114 ft (34.6 m)
Deck width93 ft (28.3 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,745 (2022)
Projected traffic21,294 by 2042
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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$450,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Gwmp over Four Mile Run built?

It was built in 1977, making it 48 years old in 2025.

What condition is Gwmp over Four Mile 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 Four Mile Run carry?

About 17,745 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Gwmp over Four Mile Run?

The structure is 336 ft (102.5 m) long with a longest span of 114 ft (34.6 m) and a deck 93 ft wide.

Who owns Gwmp over Four Mile Run?

It is owned by the National Park Service.