US Bridges

Stringfellow Road over Big Rocky Run

Good

Fairfax County, Virginia · 00.30FR4978 00.20TO4820 · Structure no. 000000000029838

Built
2013
12 years old
Condition
Good
inspected May 2023
Type
Arch - Deck
Concrete
Length
50 ft
1 main span
Daily traffic
21,869
2022 count
Owner
State
State Highway Agency

About this bridge

Stringfellow Road over Big Rocky Run is a concrete arch - deck carrying Stringfellow Road over Big Rocky Run in Fairfax County, Virginia. It was built in 2013, so it is 12 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 21,869 vehicles a day, roughly 1% of them trucks, projected to reach 25,846 by 2045. The structure is 50 ft (15.2 m) long and 112 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesStringfellow Road
CrossesBig Rocky Run
Location00.30FR4978 00.20TO4820
RouteCounty Highway 645
CountyFairfax County
StateVirginia
Coordinates38.86825, -77.40743
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating99 US tons
Inventory rating91.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span48 ft (14.6 m)
Deck width112 ft (34.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic21,869 (2022)
Projected traffic25,846 by 2045
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Stringfellow Road over Big Rocky Run built?

It was built in 2013, making it 12 years old in 2025.

What condition is Stringfellow Road over Big Rocky 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 May 2023.

How much traffic does Stringfellow Road over Big Rocky Run carry?

About 21,869 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Stringfellow Road over Big Rocky Run?

The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.6 m) and a deck 112 ft wide.

Who owns Stringfellow Road over Big Rocky Run?

It is owned by the State Highway Agency.