US Bridges

Union Av over I-279 Nb&sb

Fair

Allegheny County, Pennsylvania · Union Ave. over I-279 · Structure no. 000000000001943

Built
1987
38 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
418 ft
2 main spans
Daily traffic
8,867
2024 count
Owner
State
State Highway Agency

About this bridge

Union Av over I-279 Nb&sb is a steel continuous stringer/multi-beam or girder carrying Union Av over I-279 Nb&sb in Allegheny County, Pennsylvania. It was built in 1987, so it is 38 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 8,867 vehicles a day, roughly 3% of them trucks, projected to reach 49,042 by 2032. The structure is 418 ft (127.4 m) long and 61 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUnion Av
CrossesI-279 Nb&sb
LocationUnion Ave. over I-279
RouteState Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.51636, -80.05346
Functional classUrban Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
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 rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length418 ft (127.4 m)
Longest span252 ft (76.8 m)
Deck width61 ft (18.7 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,867 (2024)
Projected traffic49,042 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Union Av over I-279 Nb&sb built?

It was built in 1987, making it 38 years old in 2025.

What condition is Union Av over I-279 Nb&sb 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 March 2024.

How much traffic does Union Av over I-279 Nb&sb carry?

About 8,867 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Union Av over I-279 Nb&sb?

The structure is 418 ft (127.4 m) long with a longest span of 252 ft (76.8 m) and a deck 61 ft wide.

Who owns Union Av over I-279 Nb&sb?

It is owned by the State Highway Agency.