US Bridges

Pa Tpk (I-76) over Cn RR

Fair

Allegheny County, Pennsylvania · Near Oakmont · Structure no. 000000000002090

Built
1950
75 years old, rebuilt 1995
Condition
Fair
inspected May 2024
Type
Girder and Floorbeam System
Steel
Length
664 ft
6 main spans
Daily traffic
38,689
2004 count
Owner
Toll Authority
State Toll Authority

About this bridge

Pa Tpk (I-76) over Cn RR is a steel girder and floorbeam system carrying Pa Tpk (I-76) over Cn RR in Allegheny County, Pennsylvania. It was built in 1950 and reconstructed in 1995, so it is 75 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 664 ft (202.4 m) long and 92 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesPa Tpk (I-76)
CrossesCn RR
LocationNear Oakmont
RouteInterstate 76
CountyAllegheny County
StatePennsylvania
Coordinates40.52278, -79.81788
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating30 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length664 ft (202.4 m)
Longest span110 ft (33.5 m)
Deck width92 ft (27.9 m)
Roadway width86 ft (26.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,689 (2004)
Projected traffic42,977 by 2030
Trucks17%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed21.7 mi (35 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$9,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Pa Tpk (I-76) over Cn RR built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1995.

What condition is Pa Tpk (I-76) over Cn RR 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 May 2024.

How much traffic does Pa Tpk (I-76) over Cn RR carry?

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

How long is Pa Tpk (I-76) over Cn RR?

The structure is 664 ft (202.4 m) long with a longest span of 110 ft (33.5 m) and a deck 92 ft wide.

Who owns Pa Tpk (I-76) over Cn RR?

It is owned by the State Toll Authority.