US Bridges

RTE.642 over Giles Run

Good

Fairfax County, Virginia · 0.50FR747 0.60TO611 · Structure no. 000000000030459

Built
2016
9 years old
Condition
Good
inspected April 2023
Type
Arch - Deck
Concrete
Length
56 ft
1 main span
Daily traffic
12,258
2022 count
Owner
State
State Highway Agency

About this bridge

RTE.642 over Giles Run is a concrete arch - deck carrying RTE.642 over Giles Run in Fairfax County, Virginia. It was built in 2016, so it is 9 years old, younger than the Virginia average of 50.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 12,258 vehicles a day, roughly 1% of them trucks, projected to reach 17,897 by 2045. The structure is 56 ft (17.1 m) long and 163 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesRTE.642
CrossesGiles Run
Location0.50FR747 0.60TO611
RouteCounty Highway 642
CountyFairfax County
StateVirginia
Coordinates38.70564, -77.2366
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating60.4 US tons
Inventory rating46.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span54 ft (16.5 m)
Deck width163 ft (49.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic12,258 (2022)
Projected traffic17,897 by 2045
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE.642 over Giles Run built?

It was built in 2016, making it 9 years old in 2025.

What condition is RTE.642 over Giles Run in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does RTE.642 over Giles Run carry?

About 12,258 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is RTE.642 over Giles Run?

The structure is 56 ft (17.1 m) long with a longest span of 54 ft (16.5 m) and a deck 163 ft wide.

Who owns RTE.642 over Giles Run?

It is owned by the State Highway Agency.