US Bridges

Nj 18 Freeway SB over Conrail

Fair

Monmouth County, New Jersey · 4 Miles S of Rt 34 JCT · Structure no. 1323154

Built
1979
46 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
153 ft
1 main span
Daily traffic
21,133
2023 count
Owner
State
State Highway Agency

About this bridge

Nj 18 Freeway SB over Conrail is a steel stringer/multi-beam or girder carrying Nj 18 Freeway SB over Conrail in Monmouth County, New Jersey. It was built in 1979, so it is 46 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 21,133 vehicles a day, roughly 5% of them trucks, projected to reach 25,787 by 2043. The structure is 153 ft (46.6 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNj 18 Freeway SB
CrossesConrail
Location4 Miles S of Rt 34 JCT
RouteState Highway 18
Coordinates40.28328, -74.099
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
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 rating96 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length153 ft (46.6 m)
Longest span148 ft (45.1 m)
Deck width48 ft (14.7 m)
Roadway width43 ft (13 m)
Vertical clearance over deck25 ft (7.6 m)

Traffic and service

Average daily traffic21,133 (2023)
Projected traffic25,787 by 2043
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Freeway SB over Conrail built?

It was built in 1979, making it 46 years old in 2025.

What condition is Nj 18 Freeway 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 March 2023.

How much traffic does Nj 18 Freeway SB over Conrail carry?

About 21,133 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nj 18 Freeway SB over Conrail?

The structure is 153 ft (46.6 m) long with a longest span of 148 ft (45.1 m) and a deck 48 ft wide.

Who owns Nj 18 Freeway SB over Conrail?

It is owned by the State Highway Agency.