US Bridges

Main ST (cr 531) over P.Amboy-S.Plainfield Br.

Fair

Middlesex County, New Jersey · 0.6MI NW of US1&I287 JCT · Structure no. 1254161

Built
1929
96 years old, rebuilt 1998
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
106 ft
3 main spans
Daily traffic
15,794
2023 count
Owner
Unknown
Unknown

About this bridge

Main ST (cr 531) over P.Amboy-S.Plainfield Br. is a steel stringer/multi-beam or girder carrying Main ST (cr 531) over P.Amboy-S.Plainfield Br. in Middlesex County, New Jersey. It was built in 1929 and reconstructed in 1998, so it is 96 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 15,794 vehicles a day, roughly 4% of them trucks, projected to reach 19,272 by 2043. The structure is 106 ft (32.3 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMain ST (cr 531)
CrossesP.Amboy-S.Plainfield Br.
Location0.6MI NW of US1&I287 JCT
RouteCounty Highway 531
CountyMiddlesex County
StateNew Jersey
Coordinates40.53663, -74.36006
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length106 ft (32.3 m)
Longest span40 ft (12.2 m)
Deck width54 ft (16.5 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,794 (2023)
Projected traffic19,272 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesPedestrian / bicycle
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerUnknown
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 Main ST (cr 531) over P.Amboy-S.Plainfield Br. built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1998.

What condition is Main ST (cr 531) over P.Amboy-S.Plainfield Br. 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 September 2023.

How much traffic does Main ST (cr 531) over P.Amboy-S.Plainfield Br. carry?

About 15,794 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Main ST (cr 531) over P.Amboy-S.Plainfield Br.?

The structure is 106 ft (32.3 m) long with a longest span of 40 ft (12.2 m) and a deck 54 ft wide.

Who owns Main ST (cr 531) over P.Amboy-S.Plainfield Br.?

It is owned by the Unknown and maintained by the State Highway Agency.