US Bridges

Forbes Av over CSX RR Boundary ST

Fair

Allegheny County, Pennsylvania · 034 Forbes Ave Bridge · Structure no. 000000000002411

Built
1900
125 years old, rebuilt 1983
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
159 ft
1 main span
Daily traffic
8,722
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Forbes Av over CSX RR Boundary ST is a steel stringer/multi-beam or girder carrying Forbes Av over CSX RR Boundary ST in Allegheny County, Pennsylvania. It was built in 1900 and reconstructed in 1983, so it is 125 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 8,722 vehicles a day, roughly 12% of them trucks, projected to reach 30,000 by 2029. The structure is 159 ft (48.5 m) long and 56 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesForbes Av
CrossesCSX RR Boundary ST
Location034 Forbes Ave Bridge
RouteState Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.44455, -79.9468
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length159 ft (48.5 m)
Longest span150 ft (45.7 m)
Deck width56 ft (17.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,722 (2024)
Projected traffic30,000 by 2029
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Forbes Av over CSX RR Boundary ST built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1983.

What condition is Forbes Av over CSX RR Boundary 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 September 2023.

How much traffic does Forbes Av over CSX RR Boundary ST carry?

About 8,722 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Forbes Av over CSX RR Boundary ST?

The structure is 159 ft (48.5 m) long with a longest span of 150 ft (45.7 m) and a deck 56 ft wide.

Who owns Forbes Av over CSX RR Boundary ST?

It is owned by the City or Municipal Highway Agency.