US Bridges

Mine Brook Road over I-287

Fair

Somerset County, New Jersey · 3.8 MI N of I-78 JCT · Structure no. 1815161

Built
1965
60 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
225 ft
4 main spans
Daily traffic
3,048
2023 count
Owner
State
State Highway Agency

About this bridge

Mine Brook Road over I-287 is a prestressed concrete stringer/multi-beam or girder carrying Mine Brook Road over I-287 in Somerset County, New Jersey. It was built in 1965, so it is 60 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 5 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 3,048 vehicles a day, roughly 1% of them trucks, projected to reach 3,657 by 2043. The structure is 225 ft (68.6 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMine Brook Road
CrossesI-287
Location3.8 MI N of I-78 JCT
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.67829, -74.60244
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating55 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length225 ft (68.6 m)
Longest span77 ft (23.5 m)
Deck width40 ft (12.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,048 (2023)
Projected traffic3,657 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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 Mine Brook Road over I-287 built?

It was built in 1965, making it 60 years old in 2025.

What condition is Mine Brook Road over I-287 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 May 2023.

How much traffic does Mine Brook Road over I-287 carry?

About 3,048 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Mine Brook Road over I-287?

The structure is 225 ft (68.6 m) long with a longest span of 77 ft (23.5 m) and a deck 40 ft wide.

Who owns Mine Brook Road over I-287?

It is owned by the State Highway Agency.