US Bridges

Nj 18 SB over Conrail

Fair

Middlesex County, New Jersey · 2.12 MI S of Njtpk JCT · Structure no. 1212154

Built
1963
62 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
116 ft
3 main spans
Daily traffic
33,313
2022 count
Owner
State
State Highway Agency

About this bridge

Nj 18 SB over Conrail is a prestressed concrete box beam or girders - multiple carrying Nj 18 SB over Conrail in Middlesex County, New Jersey. It was built in 1963, so it is 62 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 33,313 vehicles a day, roughly 4% of them trucks, projected to reach 39,975 by 2042. The structure is 116 ft (35.4 m) long and 50 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNj 18 SB
CrossesConrail
Location2.12 MI S of Njtpk JCT
RouteState Highway 18
CountyMiddlesex County
StateNew Jersey
Coordinates40.44424, -74.39547
Functional classUrban Other Principal Arterial

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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length116 ft (35.4 m)
Longest span38 ft (11.6 m)
Deck width50 ft (15.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,313 (2022)
Projected traffic39,975 by 2042
Trucks4%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed5 mi (8 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 Nj 18 SB over Conrail built?

It was built in 1963, making it 62 years old in 2025.

What condition is Nj 18 SB over Conrail 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 August 2024.

How much traffic does Nj 18 SB over Conrail carry?

About 33,313 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Nj 18 SB over Conrail?

The structure is 116 ft (35.4 m) long with a longest span of 38 ft (11.6 m) and a deck 50 ft wide.

Who owns Nj 18 SB over Conrail?

It is owned by the State Highway Agency.