US Bridges

Kirby Road over Pimmit Run

Good

Fairfax County, Virginia · 00.35FR123/00.05TO5739 · Structure no. 000000000006857

Built
1977
48 years old, rebuilt 2019
Condition
Good
inspected December 2023
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
4,354
2022 count
Owner
State
State Highway Agency

About this bridge

Kirby Road over Pimmit Run is a concrete slab carrying Kirby Road over Pimmit Run in Fairfax County, Virginia. It was built in 1977 and reconstructed in 2019, so it is 48 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 4,354 vehicles a day, roughly 1% of them trucks, projected to reach 6,083 by 2042. The structure is 27 ft (8.2 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesKirby Road
CrossesPimmit Run
Location00.35FR123/00.05TO5739
RouteCounty Highway 695
CountyFairfax County
StateVirginia
Coordinates38.93621, -77.1393
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating94.8 US tons
Inventory rating56.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span22 ft (6.7 m)
Deck width26 ft (7.9 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,354 (2022)
Projected traffic6,083 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$150 million (2032 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Kirby Road over Pimmit Run built?

It was built in 1977, making it 48 years old in 2025. It was reconstructed in 2019.

What condition is Kirby Road over Pimmit 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 December 2023.

How much traffic does Kirby Road over Pimmit Run carry?

About 4,354 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Kirby Road over Pimmit Run?

The structure is 27 ft (8.2 m) long with a longest span of 22 ft (6.7 m) and a deck 26 ft wide.

Who owns Kirby Road over Pimmit Run?

It is owned by the State Highway Agency.