US Bridges

I-78 EB over County Route 523

Fair

Hunterdon County, New Jersey · 5.8 MI West of I-287 · Structure no. 1018168

Built
1965
60 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
81 ft
1 main span
Daily traffic
107,826
2024 count
Owner
State
State Highway Agency

About this bridge

I-78 EB over County Route 523 is a prestressed concrete stringer/multi-beam or girder carrying I-78 EB over County Route 523 in Hunterdon County, New Jersey. It was built in 1965, so it is 60 years old, older than the New Jersey average of 58.5 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 107,826 vehicles a day, roughly 9% of them trucks, projected to reach 131,568 by 2044. The structure is 81 ft (24.7 m) long and 56 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-78 EB
CrossesCounty Route 523
Location5.8 MI West of I-287
RouteInterstate 78
CountyHunterdon County
StateNew Jersey
Coordinates40.65053, -74.75469
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating61 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length81 ft (24.7 m)
Longest span77 ft (23.5 m)
Deck width56 ft (17.2 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic107,826 (2024)
Projected traffic131,568 by 2044
Trucks9%
Lanes on structure3
Traffic directionOne-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 statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$40,000 (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-78 EB over County Route 523 built?

It was built in 1965, making it 60 years old in 2025.

What condition is I-78 EB over County Route 523 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 May 2024.

How much traffic does I-78 EB over County Route 523 carry?

About 107,826 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is I-78 EB over County Route 523?

The structure is 81 ft (24.7 m) long with a longest span of 77 ft (23.5 m) and a deck 56 ft wide.

Who owns I-78 EB over County Route 523?

It is owned by the State Highway Agency.