US Bridges

SR 0279 NB over SR 4003 4009 8102

Fair

Allegheny County, Pennsylvania · Mcknight Interchange · Structure no. 000000000001068

Built
1986
39 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
834 ft
7 main spans
Daily traffic
26,806
2024 count
Owner
State
State Highway Agency

About this bridge

SR 0279 NB over SR 4003 4009 8102 is a steel continuous stringer/multi-beam or girder carrying SR 0279 NB over SR 4003 4009 8102 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 26,806 vehicles a day, roughly 5% of them trucks, projected to reach 26,116 by 2032. The structure is 834 ft (254.2 m) long and 59 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 0279 NB
CrossesSR 4003 4009 8102
LocationMcknight Interchange
RouteInterstate 279
CountyAllegheny County
StatePennsylvania
Coordinates40.49373, -80.01079
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length834 ft (254.2 m)
Longest span133 ft (40.5 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,806 (2024)
Projected traffic26,116 by 2032
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$3.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 0279 NB over SR 4003 4009 8102 built?

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

What condition is SR 0279 NB over SR 4003 4009 8102 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 NB over SR 4003 4009 8102 carry?

About 26,806 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is SR 0279 NB over SR 4003 4009 8102?

The structure is 834 ft (254.2 m) long with a longest span of 133 ft (40.5 m) and a deck 59 ft wide.

Who owns SR 0279 NB over SR 4003 4009 8102?

It is owned by the State Highway Agency.