US Bridges

Ramp S over NS RR Union RR Main ST

Fair

Allegheny County, Pennsylvania · Triboro Expressway · Structure no. 000000000001635

Built
1974
51 years old, rebuilt 2010
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,192 ft
8 main spans
Daily traffic
7,111
2024 count
Owner
State
State Highway Agency

About this bridge

Ramp S over NS RR Union RR Main ST is a steel continuous stringer/multi-beam or girder carrying Ramp S over NS RR Union RR Main ST in Allegheny County, Pennsylvania. It was built in 1974 and reconstructed in 2010, so it is 51 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 7,111 vehicles a day, roughly 9% of them trucks, projected to reach 8,808 by 2032. The structure is 1,192 ft (363.3 m) long and 64 ft wide.

Location

Open in Google Maps
CarriesRamp S
CrossesNS RR Union RR Main ST
LocationTriboro Expressway
RouteState Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.39667, -79.83833
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8 (+2 approach)
Design loadHS 20
Structure length1,192 ft (363.3 m)
Longest span162 ft (49.4 m)
Deck width64 ft (19.5 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deck38 ft (11.7 m)

Traffic and service

Average daily traffic7,111 (2024)
Projected traffic8,808 by 2032
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$8.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp S over NS RR Union RR Main ST built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 2010.

What condition is Ramp S over NS RR Union RR Main ST 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 August 2023.

How much traffic does Ramp S over NS RR Union RR Main ST carry?

About 7,111 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Ramp S over NS RR Union RR Main ST?

The structure is 1,192 ft (363.3 m) long with a longest span of 162 ft (49.4 m) and a deck 64 ft wide.

Who owns Ramp S over NS RR Union RR Main ST?

It is owned by the State Highway Agency.