US Bridges

SR 0279 SB over SR 4003 4009 & Ramp J

Fair

Allegheny County, Pennsylvania · Mcknight Interchange · Structure no. 000000000001069

Built
1986
39 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
795 ft
6 main spans
Daily traffic
40,777
2024 count
Owner
State
State Highway Agency

About this bridge

SR 0279 SB over SR 4003 4009 & Ramp J is a steel continuous stringer/multi-beam or girder carrying SR 0279 SB over SR 4003 4009 & Ramp J in Allegheny County, Pennsylvania. It was built in 1986, so it is 39 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 40,777 vehicles a day, roughly 4% of them trucks, projected to reach 18,584 by 2032. The structure is 795 ft (242.3 m) long and 49 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSR 0279 SB
CrossesSR 4003 4009 & Ramp J
LocationMcknight Interchange
RouteInterstate 279
CountyAllegheny County
StatePennsylvania
Coordinates40.49363, -80.01132
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHL 93
Structure length795 ft (242.3 m)
Longest span180 ft (54.9 m)
Deck width49 ft (15 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,777 (2024)
Projected traffic18,584 by 2032
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$1.7 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 0279 SB over SR 4003 4009 & Ramp J built?

It was built in 1986, making it 39 years old in 2025.

What condition is SR 0279 SB over SR 4003 4009 & Ramp J 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 April 2024.

How much traffic does SR 0279 SB over SR 4003 4009 & Ramp J carry?

About 40,777 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is SR 0279 SB over SR 4003 4009 & Ramp J?

The structure is 795 ft (242.3 m) long with a longest span of 180 ft (54.9 m) and a deck 49 ft wide.

Who owns SR 0279 SB over SR 4003 4009 & Ramp J?

It is owned by the State Highway Agency.