US Bridges

Nj 18 (cent. Ave) over Ambrose Brook

Good

Middlesex County, New Jersey · 0.25 Mi. S. of Inter. 287 · Structure no. 122B240

Built
1966
59 years old, rebuilt 2016
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
50 ft
1 main span
Daily traffic
24,265
2023 count
Owner
State
State Highway Agency

About this bridge

Nj 18 (cent. Ave) over Ambrose Brook is a steel stringer/multi-beam or girder carrying Nj 18 (cent. Ave) over Ambrose Brook in Middlesex County, New Jersey. It was built in 1966 and reconstructed in 2016, so it is 59 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 24,265 vehicles a day, roughly 4% of them trucks, projected to reach 29,608 by 2043. The structure is 50 ft (15.2 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNj 18 (cent. Ave)
CrossesAmbrose Brook
Location0.25 Mi. S. of Inter. 287
RouteState Highway 18
CountyMiddlesex County
StateNew Jersey
Coordinates40.55172, -74.48043
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating66 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span46 ft (14 m)
Deck width72 ft (21.9 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,265 (2023)
Projected traffic29,608 by 2043
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nj 18 (cent. Ave) over Ambrose Brook built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2016.

What condition is Nj 18 (cent. Ave) over Ambrose Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does Nj 18 (cent. Ave) over Ambrose Brook carry?

About 24,265 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nj 18 (cent. Ave) over Ambrose Brook?

The structure is 50 ft (15.2 m) long with a longest span of 46 ft (14 m) and a deck 72 ft wide.

Who owns Nj 18 (cent. Ave) over Ambrose Brook?

It is owned by the State Highway Agency.