US Bridges

Walney Road over Big Rocky Run

Good

Fairfax County, Virginia · 00.35FR.28/01.05TO662 · Structure no. 000000000006800

Built
1989
36 years old
Condition
Good
inspected July 2023
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
4,351
2022 count
Owner
State
State Highway Agency

About this bridge

Walney Road over Big Rocky Run is a prestressed concrete slab carrying Walney Road over Big Rocky Run in Fairfax County, Virginia. It was built in 1989, so it is 36 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 4,351 vehicles a day, projected to reach 4,851 by 2045. The structure is 40 ft (12.2 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesWalney Road
CrossesBig Rocky Run
Location00.35FR.28/01.05TO662
RouteCounty Highway 657
CountyFairfax County
StateVirginia
Coordinates38.85528, -77.42981
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating75.7 US tons
Inventory rating58.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,351 (2022)
Projected traffic4,851 by 2045
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$270 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Walney Road over Big Rocky Run built?

It was built in 1989, making it 36 years old in 2025.

What condition is Walney 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 July 2023.

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

About 4,351 vehicles per day (2022 count).

How long is Walney Road over Big Rocky Run?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns Walney Road over Big Rocky Run?

It is owned by the State Highway Agency.