US Bridges

Pa Tpk (I-476) over T-858

Fair

Lehigh County, Pennsylvania · 1.5 MI North of Emerald · Structure no. 000000000023574

Built
1956
69 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete
Length
32 ft
1 main span
Daily traffic
27,609
2001 count
Owner
Toll Authority
State Toll Authority

About this bridge

Pa Tpk (I-476) over T-858 is a concrete tee beam carrying Pa Tpk (I-476) over T-858 in Lehigh County, Pennsylvania. It was built in 1956, so it is 69 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 27,609 vehicles a day, roughly 18% of them trucks, projected to reach 37,217 by 2030. The structure is 32 ft (9.8 m) long and 68 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesPa Tpk (I-476)
CrossesT-858
Location1.5 MI North of Emerald
RouteInterstate 476
CountyLehigh County
StatePennsylvania
Coordinates40.75633, -75.63671
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 rating45 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span28 ft (8.5 m)
Deck width68 ft (20.7 m)
Roadway width60 ft (18.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,609 (2001)
Projected traffic37,217 by 2030
Trucks18%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$103,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Pa Tpk (I-476) over T-858 built?

It was built in 1956, making it 69 years old in 2025.

What condition is Pa Tpk (I-476) over T-858 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 June 2023.

How much traffic does Pa Tpk (I-476) over T-858 carry?

About 27,609 vehicles per day (2001 count), of which roughly 18% are trucks.

How long is Pa Tpk (I-476) over T-858?

The structure is 32 ft (9.8 m) long with a longest span of 28 ft (8.5 m) and a deck 68 ft wide.

Who owns Pa Tpk (I-476) over T-858?

It is owned by the State Toll Authority.