US Bridges

Leigh Mill Road over Difficult Run

Good

Fairfax County, Virginia · 00.55FR1125 00.10TO6120 · Structure no. 000000000029505

Built
2011
14 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
50 ft
1 main span
Daily traffic
948
2022 count
Owner
State
State Highway Agency

About this bridge

Leigh Mill Road over Difficult Run is a steel stringer/multi-beam or girder carrying Leigh 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 948 vehicles a day, roughly 1% of them trucks, projected to reach 1,057 by 2045. The structure is 50 ft (15.3 m) long and 15 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesLeigh Mill Road
CrossesDifficult Run
Location00.55FR1125 00.10TO6120
RouteCounty Highway 683
CountyFairfax County
StateVirginia
Coordinates38.97173, -77.26983
Functional classUrban Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating64.2 US tons
Inventory rating49.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20
Structure length50 ft (15.3 m)
Longest span44 ft (13.3 m)
Deck width15 ft (4.6 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic948 (2022)
Projected traffic1,057 by 2045
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
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$100 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Leigh Mill Road over Difficult Run built?

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

What condition is Leigh 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 May 2023.

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

About 948 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Leigh Mill Road over Difficult Run?

The structure is 50 ft (15.3 m) long with a longest span of 44 ft (13.3 m) and a deck 15 ft wide.

Who owns Leigh Mill Road over Difficult Run?

It is owned by the State Highway Agency.