US Bridges

I-287 over Mountain Avenue

Good

Morris County, New Jersey · 1.4 M.S.Of I-287/NJ23 JCT · Structure no. 1420182

Built
1993
32 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
105 ft
1 main span
Daily traffic
85,977
2023 count
Owner
State
State Highway Agency

About this bridge

I-287 over Mountain Avenue is a steel stringer/multi-beam or girder carrying I-287 over Mountain Avenue in Morris County, New Jersey. It was built in 1993, so it is 32 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 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 85,977 vehicles a day, roughly 9% of them trucks, projected to reach 104,908 by 2043. The structure is 105 ft (32 m) long and 129 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-287
CrossesMountain Avenue
Location1.4 M.S.Of I-287/NJ23 JCT
RouteInterstate 287
CountyMorris County
StateNew Jersey
Coordinates40.97094, -74.32367
Functional classUrban Principal Arterial - Interstate

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating73 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length105 ft (32 m)
Longest span100 ft (30.5 m)
Deck width129 ft (39.2 m)
Roadway width122 ft (37.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic85,977 (2023)
Projected traffic104,908 by 2043
Trucks9%
Lanes on structure6
Traffic directionTwo-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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-287 over Mountain Avenue built?

It was built in 1993, making it 32 years old in 2025.

What condition is I-287 over Mountain Avenue 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 March 2023.

How much traffic does I-287 over Mountain Avenue carry?

About 85,977 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-287 over Mountain Avenue?

The structure is 105 ft (32 m) long with a longest span of 100 ft (30.5 m) and a deck 129 ft wide.

Who owns I-287 over Mountain Avenue?

It is owned by the State Highway Agency.