US Bridges

Walnut Street over Yough CSX Local Sts

Fair

Allegheny County, Pennsylvania · Boston Bridge · Structure no. 000000000000684

Built
1931
94 years old, rebuilt 2010
Condition
Fair
inspected July 2024
Type
Truss - Thru
Steel Continuous
Length
1,182 ft
3 main spans
Daily traffic
12,916
2023 count
Owner
State
State Highway Agency

About this bridge

Walnut Street over Yough CSX Local Sts is a steel continuous truss - thru carrying Walnut Street over Yough CSX Local Sts in Allegheny County, Pennsylvania. It was built in 1931 and reconstructed in 2010, so it is 94 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 12,916 vehicles a day, roughly 4% of them trucks, projected to reach 20,721 by 2032. The structure is 1,182 ft (360.3 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesWalnut Street
CrossesYough CSX Local Sts
LocationBoston Bridge
RouteState Highway 48
CountyAllegheny County
StatePennsylvania
Coordinates40.31244, -79.82802
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48 US tons
Inventory rating36 US tons

Structure

Structure typeTruss - Thru
MaterialSteel Continuous
DeckClosed grating
Main spans3 (+5 approach)
Design loadHS 20
Structure length1,182 ft (360.3 m)
Longest span420 ft (128 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck27 ft (8.1 m)

Traffic and service

Average daily traffic12,916 (2023)
Projected traffic20,721 by 2032
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway, waterway and railroad
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Walnut Street over Yough CSX Local Sts built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 2010.

What condition is Walnut Street over Yough CSX Local Sts 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 July 2024.

How much traffic does Walnut Street over Yough CSX Local Sts carry?

About 12,916 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Walnut Street over Yough CSX Local Sts?

The structure is 1,182 ft (360.3 m) long with a longest span of 420 ft (128 m) and a deck 33 ft wide.

Who owns Walnut Street over Yough CSX Local Sts?

It is owned by the State Highway Agency.