US Bridges

South Exit from Na over Gwmp

Fair

Arlington County, Virginia · 1.8 Miles South of I-395. · Structure no. 3300027P0000000

Built
1965
60 years old
Condition
Fair
inspected April 2023
Type
Frame
Concrete Continuous
Length
192 ft
2 main spans
Daily traffic
17,745
2022 count
Owner
Federal
National Park Service

About this bridge

South Exit from Na over Gwmp is a concrete continuous frame carrying South Exit from Na over Gwmp in Arlington County, Virginia. It was built in 1965, so it is 60 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 17,745 vehicles a day, roughly 10% of them trucks, projected to reach 21,294 by 2042. The structure is 192 ft (58.5 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSouth Exit from Na
CrossesGwmp
Location1.8 Miles South of I-395.
RouteFederal Lands Road 500
Coordinates38.84706, -77.04864
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.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating32 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length192 ft (58.5 m)
Longest span116 ft (35.4 m)
Deck width35 ft (10.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,745 (2022)
Projected traffic21,294 by 2042
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$78,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was South Exit from Na over Gwmp built?

It was built in 1965, making it 60 years old in 2025.

What condition is South Exit from Na 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 South Exit from Na over Gwmp carry?

About 17,745 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is South Exit from Na over Gwmp?

The structure is 192 ft (58.5 m) long with a longest span of 116 ft (35.4 m) and a deck 35 ft wide.

Who owns South Exit from Na over Gwmp?

It is owned by the National Park Service.