US Bridges

18 SB over US 9 SB

Fair

Middlesex County, New Jersey · At 18-9 Interchange · Structure no. 1211158

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
24,116
2024 count
Owner
State
State Highway Agency

About this bridge

18 SB over US 9 SB is a steel stringer/multi-beam or girder carrying 18 SB over US 9 SB 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 24,116 vehicles a day, roughly 4% of them trucks, projected to reach 31,351 by 2044. 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

Open in Google Maps
Carries18 SB
CrossesUS 9 SB
LocationAt 18-9 Interchange
RouteState Highway 18
CountyMiddlesex County
StateNew Jersey
Coordinates40.37083, -74.3075
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 inspectionApril 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 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 traffic24,116 (2024)
Projected traffic31,351 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 18 SB over US 9 SB built?

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

What condition is 18 SB over US 9 SB 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 18 SB over US 9 SB carry?

About 24,116 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is 18 SB over US 9 SB?

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 18 SB over US 9 SB?

It is owned by the State Highway Agency.