US Bridges

Hunter Mill Road over Difficult Run

Good

Fairfax County, Virginia · 00.20FR0677/00.70TO673 · Structure no. 000000000029839

Built
2011
14 years old
Condition
Good
inspected November 2023
Type
Truss - Thru
Steel
Length
52 ft
1 main span
Daily traffic
13,731
2022 count
Owner
State
State Highway Agency

About this bridge

Hunter Mill Road over Difficult Run is a steel truss - thru carrying Hunter Mill Road over Difficult Run in Fairfax County, Virginia. It was built in 2011, so it is 14 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 13,731 vehicles a day, roughly 1% of them trucks, projected to reach 15,310 by 2042. The structure is 52 ft (15.9 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesHunter Mill Road
CrossesDifficult Run
Location00.20FR0677/00.70TO673
RouteCounty Highway 674
CountyFairfax County
StateVirginia
Coordinates38.92982, -77.30511
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating69 US tons
Inventory rating53.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 20
Structure length52 ft (15.9 m)
Longest span50 ft (15.2 m)
Deck width26 ft (7.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,731 (2022)
Projected traffic15,310 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.5 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Hunter Mill Road over Difficult Run built?

It was built in 2011, making it 14 years old in 2025.

What condition is Hunter Mill Road 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 November 2023.

How much traffic does Hunter Mill Road over Difficult Run carry?

About 13,731 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Hunter Mill Road over Difficult Run?

The structure is 52 ft (15.9 m) long with a longest span of 50 ft (15.2 m) and a deck 26 ft wide.

Who owns Hunter Mill Road over Difficult Run?

It is owned by the State Highway Agency.