US Bridges

Pa Tpk (I-76) over T-746

Fair

Allegheny County, Pennsylvania · Near Penn Hills · Structure no. 000000000002097

Built
1952
73 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
38,689
2004 count
Owner
Toll Authority
State Toll Authority

About this bridge

Pa Tpk (I-76) over T-746 is a prestressed concrete box beam or girders - multiple carrying Pa Tpk (I-76) over T-746 in Allegheny County, Pennsylvania. It was built in 1952, so it is 73 years old, older 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 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 38,689 vehicles a day, roughly 17% of them trucks, projected to reach 42,977 by 2030. The structure is 34 ft (10.4 m) long and 74 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesPa Tpk (I-76)
CrossesT-746
LocationNear Penn Hills
RouteInterstate 76
CountyAllegheny County
StatePennsylvania
Coordinates40.48609, -79.77736
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97 US tons
Inventory rating75 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length34 ft (10.4 m)
Longest span30 ft (9.1 m)
Deck width74 ft (22.6 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,689 (2004)
Projected traffic42,977 by 2030
Trucks17%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$244,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Pa Tpk (I-76) over T-746 built?

It was built in 1952, making it 73 years old in 2025.

What condition is Pa Tpk (I-76) over T-746 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 June 2024.

How much traffic does Pa Tpk (I-76) over T-746 carry?

About 38,689 vehicles per day (2004 count), of which roughly 17% are trucks.

How long is Pa Tpk (I-76) over T-746?

The structure is 34 ft (10.4 m) long with a longest span of 30 ft (9.1 m) and a deck 74 ft wide.

Who owns Pa Tpk (I-76) over T-746?

It is owned by the State Toll Authority.