US Bridges

SR 0279 NB over SR 0279SB

Fair

Allegheny County, Pennsylvania · Fort Duquesne Bridge · Structure no. 000000000001028

Built
1985
40 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
899 ft
8 main spans
Daily traffic
10,891
2024 count
Owner
State
State Highway Agency

About this bridge

SR 0279 NB over SR 0279SB is a steel continuous box beam or girders - multiple carrying SR 0279 NB over SR 0279SB in Allegheny County, Pennsylvania. It was built in 1985, so it is 40 years old, younger than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 10,891 vehicles a day, roughly 4% of them trucks, projected to reach 18,512 by 2032. The structure is 899 ft (274 m) long and 42 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSR 0279 NB
CrossesSR 0279SB
LocationFort Duquesne Bridge
RouteInterstate 279
CountyAllegheny County
StatePennsylvania
Coordinates40.44648, -80.00953
Functional classUrban Principal Arterial - Interstate

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.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating51.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHL 93
Structure length899 ft (274 m)
Longest span140 ft (42.7 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,891 (2024)
Projected traffic18,512 by 2032
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 0279 NB over SR 0279SB built?

It was built in 1985, making it 40 years old in 2025.

What condition is SR 0279 NB over SR 0279SB 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 July 2023.

How much traffic does SR 0279 NB over SR 0279SB carry?

About 10,891 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is SR 0279 NB over SR 0279SB?

The structure is 899 ft (274 m) long with a longest span of 140 ft (42.7 m) and a deck 42 ft wide.

Who owns SR 0279 NB over SR 0279SB?

It is owned by the State Highway Agency.