US Bridges

Nj 18 NB over Conrail

Fair

Middlesex County, New Jersey · 2.0 MI S of Njtpk JCT · Structure no. 1212153

Built
1931
94 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
112 ft
3 main spans
Daily traffic
34,578
2022 count
Owner
State
State Highway Agency

About this bridge

Nj 18 NB over Conrail is a steel stringer/multi-beam or girder carrying Nj 18 NB over Conrail in Middlesex County, New Jersey. It was built in 1931, so it is 94 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 5 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 34,578 vehicles a day, roughly 4% of them trucks, projected to reach 41,493 by 2042. The structure is 112 ft (34.1 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNj 18 NB
CrossesConrail
Location2.0 MI S of Njtpk JCT
RouteState Highway 18
CountyMiddlesex County
StateNew Jersey
Coordinates40.44391, -74.39501
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96 US tons
Inventory rating57 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length112 ft (34.1 m)
Longest span36 ft (11 m)
Deck width64 ft (19.6 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,578 (2022)
Projected traffic41,493 by 2042
Trucks4%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesRailroad
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 NB over Conrail built?

It was built in 1931, making it 94 years old in 2025.

What condition is Nj 18 NB 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 NB over Conrail carry?

About 34,578 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Nj 18 NB over Conrail?

The structure is 112 ft (34.1 m) long with a longest span of 36 ft (11 m) and a deck 64 ft wide.

Who owns Nj 18 NB over Conrail?

It is owned by the State Highway Agency.