US Bridges

I-279 SB over Various City Streets

Fair

Allegheny County, Pennsylvania · Fort Duquesne Bridge · Structure no. 000000000001032

Built
1986
39 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
1,832 ft
1 main span
Daily traffic
11,944
2024 count
Owner
State
State Highway Agency

About this bridge

I-279 SB over Various City Streets is a steel stringer/multi-beam or girder carrying I-279 SB over Various City Streets in Allegheny County, Pennsylvania. It was built in 1986, so it is 39 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 11,944 vehicles a day, roughly 5% of them trucks, projected to reach 19,690 by 2032. The structure is 1,832 ft (558.4 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-279 SB
CrossesVarious City Streets
LocationFort Duquesne Bridge
RouteInterstate 279
CountyAllegheny County
StatePennsylvania
Coordinates40.44908, -80.00561
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+19 approach)
Design loadHS 20
Structure length1,832 ft (558.4 m)
Longest span91 ft (27.7 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,944 (2024)
Projected traffic19,690 by 2032
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 I-279 SB over Various City Streets built?

It was built in 1986, making it 39 years old in 2025.

What condition is I-279 SB over Various City Streets 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 October 2023.

How much traffic does I-279 SB over Various City Streets carry?

About 11,944 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is I-279 SB over Various City Streets?

The structure is 1,832 ft (558.4 m) long with a longest span of 91 ft (27.7 m) and a deck 59 ft wide.

Who owns I-279 SB over Various City Streets?

It is owned by the State Highway Agency.