US Bridges

Mcknight RD over Ingomar Rd-Sr 4070

Fair

Allegheny County, Pennsylvania · Truck RT.19 over SR 4070 · Structure no. 000000000001914

Built
1952
73 years old, rebuilt 2016
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
144 ft
3 main spans
Daily traffic
22,173
2024 count
Owner
State
State Highway Agency

About this bridge

Mcknight RD over Ingomar Rd-Sr 4070 is a steel stringer/multi-beam or girder carrying Mcknight RD over Ingomar Rd-Sr 4070 in Allegheny County, Pennsylvania. It was built in 1952 and reconstructed in 2016, so it is 73 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 22,173 vehicles a day, roughly 2% of them trucks, projected to reach 24,242 by 2032. The structure is 144 ft (43.9 m) long and 72 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMcknight RD
CrossesIngomar Rd-Sr 4070
LocationTruck RT.19 over SR 4070
RouteU.S. Route 19T
CountyAllegheny County
StatePennsylvania
Coordinates40.58658, -80.04046
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
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 alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating81 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length144 ft (43.9 m)
Longest span79 ft (24.1 m)
Deck width72 ft (21.9 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,173 (2024)
Projected traffic24,242 by 2032
Trucks2%
Lanes on structure4
Traffic directionTwo-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$673,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mcknight RD over Ingomar Rd-Sr 4070 built?

It was built in 1952, making it 73 years old in 2025. It was reconstructed in 2016.

What condition is Mcknight RD over Ingomar Rd-Sr 4070 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 2023.

How much traffic does Mcknight RD over Ingomar Rd-Sr 4070 carry?

About 22,173 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Mcknight RD over Ingomar Rd-Sr 4070?

The structure is 144 ft (43.9 m) long with a longest span of 79 ft (24.1 m) and a deck 72 ft wide.

Who owns Mcknight RD over Ingomar Rd-Sr 4070?

It is owned by the State Highway Agency.