US Bridges

Ramp I over Mcknight Interchange

Good

Allegheny County, Pennsylvania · Ramp I-Over Evergreen RD · Structure no. 000000000002916

Built
1986
39 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
247 ft
3 main spans
Daily traffic
15,036
2024 count
Owner
State
State Highway Agency

About this bridge

Ramp I over Mcknight Interchange is a steel continuous stringer/multi-beam or girder carrying Ramp I over Mcknight Interchange 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15,036 vehicles a day, roughly 7% of them trucks, projected to reach 14,235 by 2032. The structure is 247 ft (75.3 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRamp I
CrossesMcknight Interchange
LocationRamp I-Over Evergreen RD
RouteState Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.5, -80
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length247 ft (75.3 m)
Longest span93 ft (28.3 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,036 (2024)
Projected traffic14,235 by 2032
Trucks7%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$302,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp I over Mcknight Interchange built?

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

What condition is Ramp I over Mcknight Interchange in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does Ramp I over Mcknight Interchange carry?

About 15,036 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Ramp I over Mcknight Interchange?

The structure is 247 ft (75.3 m) long with a longest span of 93 ft (28.3 m) and a deck 36 ft wide.

Who owns Ramp I over Mcknight Interchange?

It is owned by the State Highway Agency.