US Bridges

Birmingham Bridge over Mon River CSX RR

Fair

Allegheny County, Pennsylvania · Birmingham Bridge · Structure no. 000000000001640

Built
1976
49 years old, rebuilt 2016
Condition
Fair
inspected June 2024
Type
Arch - Thru
Steel
Length
1,662 ft
1 main span
Daily traffic
25,692
2024 count
Owner
State
State Highway Agency

About this bridge

Birmingham Bridge over Mon River CSX RR is a steel arch - thru carrying Birmingham Bridge over Mon River CSX RR in Allegheny County, Pennsylvania. It was built in 1976 and reconstructed in 2016, so it is 49 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 25,692 vehicles a day, roughly 6% of them trucks, projected to reach 26,062 by 2032. The structure is 1,662 ft (506.6 m) long and 105 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesBirmingham Bridge
CrossesMon River CSX RR
LocationBirmingham Bridge
RouteState Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.43241, -79.97358
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+11 approach)
Design loadHS 20
Structure length1,662 ft (506.6 m)
Longest span620 ft (189 m)
Deck width105 ft (32 m)
Roadway width94 ft (28.5 m)
Vertical clearance over deck36 ft (11 m)

Traffic and service

Average daily traffic25,692 (2024)
Projected traffic26,062 by 2032
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad and waterway
Detour if closed5 mi (8 km)
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$2.8 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Birmingham Bridge over Mon River CSX RR built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2016.

What condition is Birmingham Bridge over Mon River CSX 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 June 2024.

How much traffic does Birmingham Bridge over Mon River CSX RR carry?

About 25,692 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Birmingham Bridge over Mon River CSX RR?

The structure is 1,662 ft (506.6 m) long with a longest span of 620 ft (189 m) and a deck 105 ft wide.

Who owns Birmingham Bridge over Mon River CSX RR?

It is owned by the State Highway Agency.