US Bridges

Monument Dr. over Difficult Run

Good

Fairfax County, Virginia · 00.22FR GCP/00.35TO Fca · Structure no. 000000000028540

Built
2004
21 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
8,681
2022 count
Owner
State
State Highway Agency

About this bridge

Monument Dr. over Difficult Run is a concrete culvert carrying Monument Dr. over Difficult Run in Fairfax County, Virginia. It was built in 2004, so it is 21 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 8,681 vehicles a day, roughly 1% of them trucks, projected to reach 9,679 by 2045. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMonument Dr.
CrossesDifficult Run
Location00.22FR GCP/00.35TO Fca
RouteCounty Highway 7969
CountyFairfax County
StateVirginia
Coordinates38.85565, -77.35041
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,681 (2022)
Projected traffic9,679 by 2045
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$150 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Monument Dr. over Difficult Run built?

It was built in 2004, making it 21 years old in 2025.

What condition is Monument Dr. over Difficult 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 Monument Dr. over Difficult Run carry?

About 8,681 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Monument Dr. over Difficult Run?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m).

Who owns Monument Dr. over Difficult Run?

It is owned by the State Highway Agency.