US Bridges

Annandale Road over Tripps Run

Fair

Fairfax County, Virginia · 00.50FR708/00.21TO50 · Structure no. 000000000006779

Built
1966
59 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
56 ft
1 main span
Daily traffic
13,953
2022 count
Owner
State
State Highway Agency

About this bridge

Annandale Road over Tripps Run is a steel stringer/multi-beam or girder carrying Annandale Road over Tripps Run in Fairfax County, Virginia. It was built in 1966, so it is 59 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 13,953 vehicles a day, projected to reach 19,415 by 2042. The structure is 56 ft (17.1 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesAnnandale Road
CrossesTripps Run
Location00.50FR708/00.21TO50
RouteCounty Highway 649
CountyFairfax County
StateVirginia
Coordinates38.86669, -77.17481
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating73.1 US tons
Inventory rating56.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span56 ft (17.1 m)
Deck width60 ft (18.3 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,953 (2022)
Projected traffic19,415 by 2042
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
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$200 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Annandale Road over Tripps Run built?

It was built in 1966, making it 59 years old in 2025.

What condition is Annandale Road over Tripps 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 2024.

How much traffic does Annandale Road over Tripps Run carry?

About 13,953 vehicles per day (2022 count).

How long is Annandale Road over Tripps Run?

The structure is 56 ft (17.1 m) long with a longest span of 56 ft (17.1 m) and a deck 60 ft wide.

Who owns Annandale Road over Tripps Run?

It is owned by the State Highway Agency.