US Bridges

Gwmp (nb) over Spout Run

Fair

Arlington County, Virginia · 7.8 Miles South of I-495. · Structure no. 3300011P0000000

Built
1958
67 years old
Condition
Fair
inspected April 2023
Type
Arch - Deck
Concrete
Length
25 ft
1 main span
Daily traffic
32,750
2019 count
Owner
Federal
National Park Service

About this bridge

Gwmp (nb) over Spout Run is a concrete arch - deck carrying Gwmp (nb) over Spout Run in Arlington County, Virginia. It was built in 1958, so it is 67 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 32,750 vehicles a day, roughly 1% of them trucks, projected to reach 36,025 by 2039. The structure is 25 ft (7.7 m) long and 39 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesGwmp (nb)
CrossesSpout Run
Location7.8 Miles South of I-495.
RouteFederal Lands Road 2
CountyArlington County
StateVirginia
Coordinates38.90228, -77.08278
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Superstructure7 GoodSome minor problems.
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 evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating75 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 15
Structure length25 ft (7.7 m)
Longest span25 ft (7.7 m)
Deck width39 ft (11.9 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,750 (2019)
Projected traffic36,025 by 2039
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$23,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Gwmp (nb) over Spout Run built?

It was built in 1958, making it 67 years old in 2025.

What condition is Gwmp (nb) over Spout 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 (nb) over Spout Run carry?

About 32,750 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is Gwmp (nb) over Spout Run?

The structure is 25 ft (7.7 m) long with a longest span of 25 ft (7.7 m) and a deck 39 ft wide.

Who owns Gwmp (nb) over Spout Run?

It is owned by the National Park Service.