US Bridges

Ramp G of I-78 over I-287 NB

Poor

Somerset County, New Jersey · At I-78 Jct. · Structure no. 1814167

Built
1964
61 years old
Condition
Poor
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
137 ft
3 main spans
Daily traffic
17,707
2023 count
Owner
State
State Highway Agency

About this bridge

Ramp G of I-78 over I-287 NB is a steel stringer/multi-beam or girder carrying Ramp G of I-78 over I-287 NB in Somerset County, New Jersey. It was built in 1964, so it is 61 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 17,707 vehicles a day, roughly 9% of them trucks, projected to reach 21,249 by 2043. The structure is 137 ft (41.8 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesRamp G of I-78
CrossesI-287 NB
LocationAt I-78 Jct.
RouteInterstate 78
CountySomerset County
StateNew Jersey
Coordinates40.64439, -74.64508
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating75.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length137 ft (41.8 m)
Longest span78 ft (23.8 m)
Deck width35 ft (10.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,707 (2023)
Projected traffic21,249 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$2.2 million (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp G of I-78 over I-287 NB built?

It was built in 1964, making it 61 years old in 2025.

What condition is Ramp G of I-78 over I-287 NB in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.

How much traffic does Ramp G of I-78 over I-287 NB carry?

About 17,707 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Ramp G of I-78 over I-287 NB?

The structure is 137 ft (41.8 m) long with a longest span of 78 ft (23.8 m) and a deck 35 ft wide.

Who owns Ramp G of I-78 over I-287 NB?

It is owned by the State Highway Agency.