US Bridges

Nj 18 Northbound over US 9 Southbound

Fair

Middlesex County, New Jersey · 1.13 MI N of Rt 9/520 JCT · Structure no. 1211159

Built
1972
53 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
140 ft
1 main span
Daily traffic
50,254
2022 count
Owner
State
State Highway Agency

About this bridge

Nj 18 Northbound over US 9 Southbound is a steel stringer/multi-beam or girder carrying Nj 18 Northbound over US 9 Southbound in Middlesex County, New Jersey. It was built in 1972, so it is 53 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 50,254 vehicles a day, roughly 4% of them trucks, projected to reach 61,319 by 2042. The structure is 140 ft (42.7 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNj 18 Northbound
CrossesUS 9 Southbound
Location1.13 MI N of Rt 9/520 JCT
RouteState Highway 18
CountyMiddlesex County
StateNew Jersey
Coordinates40.37111, -74.30667
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating77.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span135 ft (41.1 m)
Deck width48 ft (14.7 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50,254 (2022)
Projected traffic61,319 by 2042
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

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 Nj 18 Northbound over US 9 Southbound built?

It was built in 1972, making it 53 years old in 2025.

What condition is Nj 18 Northbound over US 9 Southbound 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 April 2024.

How much traffic does Nj 18 Northbound over US 9 Southbound carry?

About 50,254 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Nj 18 Northbound over US 9 Southbound?

The structure is 140 ft (42.7 m) long with a longest span of 135 ft (41.1 m) and a deck 48 ft wide.

Who owns Nj 18 Northbound over US 9 Southbound?

It is owned by the State Highway Agency.