US Bridges

Stanwix ST over I-376 WB (parkway East)

Fair

Allegheny County, Pennsylvania · 106 Stanwix ST Bridge · Structure no. 000000000002455

Built
1939
86 years old, rebuilt 2002
Condition
Fair
inspected December 2022
Type
Girder and Floorbeam System
Steel
Length
71 ft
1 main span
Daily traffic
8,600
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Stanwix ST over I-376 WB (parkway East) is a steel girder and floorbeam system carrying Stanwix ST over I-376 WB (parkway East) in Allegheny County, Pennsylvania. It was built in 1939 and reconstructed in 2002, so it is 86 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 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 8,600 vehicles a day, roughly 5% of them trucks, projected to reach 9,000 by 2039. The structure is 71 ft (21.6 m) long and 87 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesStanwix ST
CrossesI-376 WB (parkway East)
Location106 Stanwix ST Bridge
RouteCity Street 0
Coordinates40.43841, -80.0059
Functional classUrban Other Principal 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
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 rating50 US tons
Inventory rating30 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span67 ft (20.4 m)
Deck width87 ft (26.4 m)
Roadway width66 ft (20.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,600 (2022)
Projected traffic9,000 by 2039
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Stanwix ST over I-376 WB (parkway East) built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 2002.

What condition is Stanwix ST over I-376 WB (parkway East) 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 December 2022.

How much traffic does Stanwix ST over I-376 WB (parkway East) carry?

About 8,600 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Stanwix ST over I-376 WB (parkway East)?

The structure is 71 ft (21.6 m) long with a longest span of 67 ft (20.4 m) and a deck 87 ft wide.

Who owns Stanwix ST over I-376 WB (parkway East)?

It is owned by the City or Municipal Highway Agency.