US Bridges

SR 4006 Lr 39041 over Pa Tpk (I-476)

Fair

Lehigh County, Pennsylvania · 6 MI North of Allentown · Structure no. 000000000023564

Built
1955
70 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
100 ft
1 main span
Daily traffic
2,441
2024 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR 4006 Lr 39041 over Pa Tpk (I-476) is a steel stringer/multi-beam or girder carrying SR 4006 Lr 39041 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 2,441 vehicles a day, roughly 5% of them trucks, projected to reach 2,851 by 2030. The structure is 100 ft (30.5 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 4006 Lr 39041
CrossesPa Tpk (I-476)
Location6 MI North of Allentown
RouteState Highway 0
CountyLehigh County
StatePennsylvania
Coordinates40.64604, -75.58449
Functional classUrban Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94 US tons
Inventory rating56 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span90 ft (27.4 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,441 (2024)
Projected traffic2,851 by 2030
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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$126,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 4006 Lr 39041 over Pa Tpk (I-476) built?

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

What condition is SR 4006 Lr 39041 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 SR 4006 Lr 39041 over Pa Tpk (I-476) carry?

About 2,441 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is SR 4006 Lr 39041 over Pa Tpk (I-476)?

The structure is 100 ft (30.5 m) long with a longest span of 90 ft (27.4 m) and a deck 34 ft wide.

Who owns SR 4006 Lr 39041 over Pa Tpk (I-476)?

It is owned by the State Toll Authority.