US Bridges

Route Nj 18 NB over US 9 NB and Ramp 8

Fair

Middlesex County, New Jersey · Rt 18 & US 9 Interchange · Structure no. 1211157

Built
1972
53 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
186 ft
2 main spans
Daily traffic
25,595
2024 count
Owner
State
State Highway Agency

About this bridge

Route Nj 18 NB over US 9 NB and Ramp 8 is a steel stringer/multi-beam or girder carrying Route Nj 18 NB over US 9 NB and Ramp 8 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 25,595 vehicles a day, roughly 4% of them trucks, projected to reach 30,714 by 2044. The structure is 186 ft (56.7 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesRoute Nj 18 NB
CrossesUS 9 NB and Ramp 8
LocationRt 18 & US 9 Interchange
RouteState Highway 18
CountyMiddlesex County
StateNew Jersey
Coordinates40.3694, -74.30393
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating66 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length186 ft (56.7 m)
Longest span91 ft (27.7 m)
Deck width48 ft (14.7 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,595 (2024)
Projected traffic30,714 by 2044
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 Route Nj 18 NB over US 9 NB and Ramp 8 built?

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

What condition is Route Nj 18 NB over US 9 NB and Ramp 8 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 February 2024.

How much traffic does Route Nj 18 NB over US 9 NB and Ramp 8 carry?

About 25,595 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Route Nj 18 NB over US 9 NB and Ramp 8?

The structure is 186 ft (56.7 m) long with a longest span of 91 ft (27.7 m) and a deck 48 ft wide.

Who owns Route Nj 18 NB over US 9 NB and Ramp 8?

It is owned by the State Highway Agency.