US Bridges

Route 7 over Difficult Run

Good

Fairfax County, Virginia · 00.18FR743 00.14TO6740 · Structure no. 000000000030828

Built
2022
3 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
270 ft
3 main spans
Daily traffic
49,672
2022 count
Owner
State
State Highway Agency

About this bridge

Route 7 over Difficult Run is a concrete continuous stringer/multi-beam or girder carrying Route 7 over Difficult Run in Fairfax County, Virginia. It was built in 2022, so it is 3 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 49,672 vehicles a day, roughly 1% of them trucks, projected to reach 54,645 by 2045. The structure is 270 ft (82.3 m) long and 117 ft wide.

Location

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CarriesRoute 7
CrossesDifficult Run
Location00.18FR743 00.14TO6740
RouteState Highway 7
CountyFairfax County
StateVirginia
Coordinates38.96592, -77.28822
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation9: Superior to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.7 US tons
Inventory rating52.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length270 ft (82.3 m)
Longest span100 ft (30.5 m)
Deck width117 ft (35.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic49,672 (2022)
Projected traffic54,645 by 2045
Trucks1%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 7 over Difficult Run built?

It was built in 2022, making it 3 years old in 2025.

What condition is Route 7 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 August 2023.

How much traffic does Route 7 over Difficult Run carry?

About 49,672 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Route 7 over Difficult Run?

The structure is 270 ft (82.3 m) long with a longest span of 100 ft (30.5 m) and a deck 117 ft wide.

Who owns Route 7 over Difficult Run?

It is owned by the State Highway Agency.