US Bridges

Bunn RD over I-78

Fair

Somerset County, New Jersey · 1.2 MI West of I-287 · Structure no. 1816156

Built
1965
60 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
172 ft
2 main spans
Daily traffic
1,904
2023 count
Owner
State
State Highway Agency

About this bridge

Bunn RD over I-78 is a prestressed concrete stringer/multi-beam or girder carrying Bunn RD over I-78 in Somerset 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 1,904 vehicles a day, roughly 3% of them trucks, projected to reach 2,323 by 2043. The structure is 172 ft (52.4 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesBunn RD
CrossesI-78
Location1.2 MI West of I-287
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.64361, -74.66778
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
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 alignment7: Better than present minimum criteria
Operating rating73 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length172 ft (52.4 m)
Longest span83 ft (25.3 m)
Deck width44 ft (13.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,904 (2023)
Projected traffic2,323 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Bunn RD over I-78 built?

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

What condition is Bunn RD 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 December 2024.

How much traffic does Bunn RD over I-78 carry?

About 1,904 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Bunn RD over I-78?

The structure is 172 ft (52.4 m) long with a longest span of 83 ft (25.3 m) and a deck 44 ft wide.

Who owns Bunn RD over I-78?

It is owned by the State Highway Agency.