US Bridges

Cedar Road over I-78

Fair

Hunterdon County, New Jersey · 0.70 MI E of I-78 Exit 24 · Structure no. 1018172

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
176 ft
2 main spans
Daily traffic
1,769
2023 count
Owner
State
State Highway Agency

About this bridge

Cedar Road over I-78 is a prestressed concrete stringer/multi-beam or girder carrying Cedar Road over I-78 in Hunterdon County, New Jersey. It was built in 1967, so it is 58 years old, younger 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 1,769 vehicles a day, roughly 3% of them trucks, projected to reach 2,123 by 2043. The structure is 176 ft (53.6 m) long and 44 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCedar Road
CrossesI-78
Location0.70 MI E of I-78 Exit 24
RouteCity Street 0
CountyHunterdon County
StateNew Jersey
Coordinates40.64922, -74.74133
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating53 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span85 ft (25.9 m)
Deck width44 ft (13.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,769 (2023)
Projected traffic2,123 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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 Cedar Road over I-78 built?

It was built in 1967, making it 58 years old in 2025.

What condition is Cedar Road over I-78 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 2023.

How much traffic does Cedar Road over I-78 carry?

About 1,769 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Cedar Road over I-78?

The structure is 176 ft (53.6 m) long with a longest span of 85 ft (25.9 m) and a deck 44 ft wide.

Who owns Cedar Road over I-78?

It is owned by the State Highway Agency.