US Bridges

Sully Road Nbl over Horsepen Run

Fair

Fairfax County, Virginia · 01.00FR668/00.15TO608 · Structure no. 000000000006262

Built
1961
64 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
122 ft
3 main spans
Daily traffic
42,498
2022 count
Owner
State
State Highway Agency

About this bridge

Sully Road Nbl over Horsepen Run is a steel stringer/multi-beam or girder carrying Sully Road Nbl over Horsepen Run in Fairfax County, Virginia. It was built in 1961, so it is 64 years old, older 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 42,498 vehicles a day, roughly 1% of them trucks, projected to reach 62,047 by 2045. The structure is 122 ft (37.2 m) long and 62 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSully Road Nbl
CrossesHorsepen Run
Location01.00FR668/00.15TO608
RouteState Highway 28
CountyFairfax County
StateVirginia
Coordinates38.9464, -77.42954
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.3 US tons
Inventory rating59.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length122 ft (37.2 m)
Longest span42 ft (12.8 m)
Deck width62 ft (18.9 m)
Roadway width59 ft (18 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,498 (2022)
Projected traffic62,047 by 2045
Trucks1%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$210 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Sully Road Nbl over Horsepen Run built?

It was built in 1961, making it 64 years old in 2025.

What condition is Sully Road Nbl over Horsepen 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 Sully Road Nbl over Horsepen Run carry?

About 42,498 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Sully Road Nbl over Horsepen Run?

The structure is 122 ft (37.2 m) long with a longest span of 42 ft (12.8 m) and a deck 62 ft wide.

Who owns Sully Road Nbl over Horsepen Run?

It is owned by the State Highway Agency.