US Bridges

I-78 & PA.309 over Pa 29&SR1019 Cedar Crest

Fair

Lehigh County, Pennsylvania · Cedar Crest Exit #55(17) · Structure no. 000000000023042

Built
1989
36 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
177 ft
3 main spans
Daily traffic
80,843
2024 count
Owner
State
State Highway Agency

About this bridge

I-78 & PA.309 over Pa 29&SR1019 Cedar Crest is a prestressed concrete stringer/multi-beam or girder carrying I-78 & PA.309 over Pa 29&SR1019 Cedar Crest in Lehigh County, Pennsylvania. It was built in 1989, so it is 36 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 80,843 vehicles a day, roughly 19% of them trucks, projected to reach 110,518 by 2032. The structure is 177 ft (53.9 m) long and 156 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-78 & PA.309
CrossesPa 29&SR1019 Cedar Crest
LocationCedar Crest Exit #55(17)
RouteInterstate 78
CountyLehigh County
StatePennsylvania
Coordinates40.56772, -75.51839
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 inspectionFebruary 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 alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating49.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length177 ft (53.9 m)
Longest span110 ft (33.5 m)
Deck width156 ft (47.7 m)
Roadway width146 ft (44.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80,843 (2024)
Projected traffic110,518 by 2032
Trucks19%
Lanes on structure8
Traffic directionTwo-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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-78 & PA.309 over Pa 29&SR1019 Cedar Crest built?

It was built in 1989, making it 36 years old in 2025.

What condition is I-78 & PA.309 over Pa 29&SR1019 Cedar Crest 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 February 2024.

How much traffic does I-78 & PA.309 over Pa 29&SR1019 Cedar Crest carry?

About 80,843 vehicles per day (2024 count), of which roughly 19% are trucks.

How long is I-78 & PA.309 over Pa 29&SR1019 Cedar Crest?

The structure is 177 ft (53.9 m) long with a longest span of 110 ft (33.5 m) and a deck 156 ft wide.

Who owns I-78 & PA.309 over Pa 29&SR1019 Cedar Crest?

It is owned by the State Highway Agency.