US Bridges

Lr 39088 SR 4001 over Pa Tpk (I-476)

Fair

Lehigh County, Pennsylvania · West of Allentown · Structure no. 000000000023558

Built
1955
70 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
79 ft
1 main span
Daily traffic
5,034
2024 count
Owner
Toll Authority
State Toll Authority

About this bridge

Lr 39088 SR 4001 over Pa Tpk (I-476) is a steel stringer/multi-beam or girder carrying Lr 39088 SR 4001 over Pa Tpk (I-476) in Lehigh County, Pennsylvania. It was built in 1955, so it is 70 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 5,034 vehicles a day, roughly 6% of them trucks, projected to reach 4,324 by 2030. The structure is 79 ft (24.1 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLr 39088 SR 4001
CrossesPa Tpk (I-476)
LocationWest of Allentown
RouteState Highway 0
CountyLehigh County
StatePennsylvania
Coordinates40.60589, -75.57445
Functional classUrban Local

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating93 US tons
Inventory rating72 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length79 ft (24.1 m)
Longest span74 ft (22.6 m)
Deck width35 ft (10.6 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,034 (2024)
Projected traffic4,324 by 2030
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$213,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Lr 39088 SR 4001 over Pa Tpk (I-476) built?

It was built in 1955, making it 70 years old in 2025.

What condition is Lr 39088 SR 4001 over Pa Tpk (I-476) 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 August 2023.

How much traffic does Lr 39088 SR 4001 over Pa Tpk (I-476) carry?

About 5,034 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Lr 39088 SR 4001 over Pa Tpk (I-476)?

The structure is 79 ft (24.1 m) long with a longest span of 74 ft (22.6 m) and a deck 35 ft wide.

Who owns Lr 39088 SR 4001 over Pa Tpk (I-476)?

It is owned by the State Toll Authority.