US Bridges

Gambrill Road over Middle Run

Fair

Fairfax County, Virginia · 00.10FR6078/00.10TO7067 · Structure no. 000000000024654

Built
1996
29 years old
Condition
Fair
inspected February 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
4,861
2022 count
Owner
State
State Highway Agency

About this bridge

Gambrill Road over Middle Run is a concrete culvert carrying Gambrill Road over Middle Run in Fairfax County, Virginia. It was built in 1996, so it is 29 years old, younger 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 5 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 4,861 vehicles a day, roughly 1% of them trucks, projected to reach 5,420 by 2045. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesGambrill Road
CrossesMiddle Run
Location00.10FR6078/00.10TO7067
RouteCounty Highway 640
CountyFairfax County
StateVirginia
Coordinates38.75038, -77.23406
Functional classUrban Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating98.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length22 ft (6.7 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,861 (2022)
Projected traffic5,420 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$125 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Gambrill Road over Middle Run built?

It was built in 1996, making it 29 years old in 2025.

What condition is Gambrill Road over Middle 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 February 2023.

How much traffic does Gambrill Road over Middle Run carry?

About 4,861 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Gambrill Road over Middle Run?

The structure is 22 ft (6.7 m) long with a longest span of 11 ft (3.4 m).

Who owns Gambrill Road over Middle Run?

It is owned by the State Highway Agency.