US Bridges

Kirby Rd. over Trib. of Pimmit Run

Fair

Fairfax County, Virginia · 00.01FR2821/00.23TO693 · Structure no. 000000000024862

Built
1974
51 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
21 ft
3 main spans
Daily traffic
9,894
2022 count
Owner
State
State Highway Agency

About this bridge

Kirby Rd. over Trib. of Pimmit Run is a concrete culvert carrying Kirby Rd. over Trib. of Pimmit Run in Fairfax County, Virginia. It was built in 1974, so it is 51 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 6 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 9,894 vehicles a day, roughly 1% of them trucks, projected to reach 13,126 by 2045. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKirby Rd.
CrossesTrib. of Pimmit Run
Location00.01FR2821/00.23TO693
RouteCounty Highway 695
CountyFairfax County
StateVirginia
Coordinates38.912, -77.16917
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99 US tons
Inventory rating67 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span7 ft (2.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,894 (2022)
Projected traffic13,126 by 2045
Trucks1%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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$55 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Kirby Rd. over Trib. of Pimmit Run built?

It was built in 1974, making it 51 years old in 2025.

What condition is Kirby Rd. over Trib. of Pimmit 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 June 2023.

How much traffic does Kirby Rd. over Trib. of Pimmit Run carry?

About 9,894 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Kirby Rd. over Trib. of Pimmit Run?

The structure is 21 ft (6.4 m) long with a longest span of 7 ft (2.1 m).

Who owns Kirby Rd. over Trib. of Pimmit Run?

It is owned by the State Highway Agency.