US Bridges

I-287 N.B. over Mount Airy Road (CO.525)

Fair

Somerset County, New Jersey · At I-287 Exit 26 · Structure no. 1815166

Built
1968
57 years old, rebuilt 1997
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
105 ft
3 main spans
Daily traffic
56,404
2024 count
Owner
State
State Highway Agency

About this bridge

I-287 N.B. over Mount Airy Road (CO.525) is a steel stringer/multi-beam or girder carrying I-287 N.B. over Mount Airy Road (CO.525) in Somerset County, New Jersey. It was built in 1968 and reconstructed in 1997, so it is 57 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 56,404 vehicles a day, roughly 9% of them trucks, projected to reach 68,823 by 2044. The structure is 105 ft (32 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-287 N.B.
CrossesMount Airy Road (CO.525)
LocationAt I-287 Exit 26
RouteInterstate 287
CountySomerset County
StateNew Jersey
Coordinates40.68887, -74.5772
Functional classUrban Principal Arterial - Interstate

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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78 US tons
Inventory rating47 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length105 ft (32 m)
Longest span63 ft (19.2 m)
Deck width69 ft (20.9 m)
Roadway width65 ft (19.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,404 (2024)
Projected traffic68,823 by 2044
Trucks9%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-287 N.B. over Mount Airy Road (CO.525) built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1997.

What condition is I-287 N.B. over Mount Airy Road (CO.525) 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 June 2024.

How much traffic does I-287 N.B. over Mount Airy Road (CO.525) carry?

About 56,404 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is I-287 N.B. over Mount Airy Road (CO.525)?

The structure is 105 ft (32 m) long with a longest span of 63 ft (19.2 m) and a deck 69 ft wide.

Who owns I-287 N.B. over Mount Airy Road (CO.525)?

It is owned by the State Highway Agency.