US Bridges

Thorn Hill Road over Pa Tpk (I-76)

Good

Allegheny County, Pennsylvania · West of Warrendale · Structure no. 000000000052856

Built
2015
10 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
173 ft
2 main spans
Daily traffic
22,384
2016 count
Owner
Toll Authority
State Toll Authority

About this bridge

Thorn Hill Road over Pa Tpk (I-76) is a prestressed concrete continuous stringer/multi-beam or girder carrying Thorn Hill Road over Pa Tpk (I-76) in Allegheny County, Pennsylvania. It was built in 2015, so it is 10 years old, younger than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 22,384 vehicles a day, roughly 5% of them trucks, projected to reach 27,313 by 2036. The structure is 173 ft (52.7 m) long and 55 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesThorn Hill Road
CrossesPa Tpk (I-76)
LocationWest of Warrendale
RouteCounty Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.66726, -80.09808
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating55 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length173 ft (52.7 m)
Longest span84 ft (25.6 m)
Deck width55 ft (16.9 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,384 (2016)
Projected traffic27,313 by 2036
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 Thorn Hill Road over Pa Tpk (I-76) built?

It was built in 2015, making it 10 years old in 2025.

What condition is Thorn Hill Road over Pa Tpk (I-76) in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does Thorn Hill Road over Pa Tpk (I-76) carry?

About 22,384 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Thorn Hill Road over Pa Tpk (I-76)?

The structure is 173 ft (52.7 m) long with a longest span of 84 ft (25.6 m) and a deck 55 ft wide.

Who owns Thorn Hill Road over Pa Tpk (I-76)?

It is owned by the State Toll Authority.