US Bridges

Ninth Street Br over Allegh Riv 10 ST By-Pass

Fair

Allegheny County, Pennsylvania · AL04 9th ST Bridge · Structure no. 000000000002383

Built
1926
99 years old, rebuilt 2020
Condition
Fair
inspected May 2023
Type
Suspension
Steel Continuous
Length
995 ft
3 main spans
Daily traffic
22,462
2005 count
Owner
County
County Highway Agency

About this bridge

Ninth Street Br over Allegh Riv 10 ST By-Pass is a steel continuous suspension carrying Ninth Street Br over Allegh Riv 10 ST By-Pass in Allegheny County, Pennsylvania. It was built in 1926 and reconstructed in 2020, so it is 99 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 22,462 vehicles a day, roughly 5% of them trucks, projected to reach 22,462 by 2025. The structure is 995 ft (303.3 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNinth Street Br
CrossesAllegh Riv 10 ST By-Pass
LocationAL04 9th ST Bridge
RouteCounty Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.4466, -79.9997
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating39.2 US tons

Structure

Structure typeSuspension
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHL 93
Structure length995 ft (303.3 m)
Longest span430 ft (131.1 m)
Deck width38 ft (11.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deck16 ft (4.8 m)

Traffic and service

Average daily traffic22,462 (2005)
Projected traffic22,462 by 2025
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.7 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Ninth Street Br over Allegh Riv 10 ST By-Pass built?

It was built in 1926, making it 99 years old in 2025. It was reconstructed in 2020.

What condition is Ninth Street Br over Allegh Riv 10 ST By-Pass 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 May 2023.

How much traffic does Ninth Street Br over Allegh Riv 10 ST By-Pass carry?

About 22,462 vehicles per day (2005 count), of which roughly 5% are trucks.

How long is Ninth Street Br over Allegh Riv 10 ST By-Pass?

The structure is 995 ft (303.3 m) long with a longest span of 430 ft (131.1 m) and a deck 38 ft wide.

Who owns Ninth Street Br over Allegh Riv 10 ST By-Pass?

It is owned by the County Highway Agency.