US Bridges

Hillcrest RD RT531 over Passaic River

Fair

Somerset County, New Jersey · 1.50 MI N of I-78 · Structure no. 18L1109

Built
1998
27 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
86 ft
2 main spans
Daily traffic
10,560
2023 count
Owner
County
County Highway Agency

About this bridge

Hillcrest RD RT531 over Passaic River is a steel continuous stringer/multi-beam or girder carrying Hillcrest RD RT531 over Passaic River in Somerset County, New Jersey. It was built in 1998, so it is 27 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 10,560 vehicles a day, roughly 4% of them trucks, projected to reach 12,885 by 2043. The structure is 86 ft (26.2 m) long and 44 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesHillcrest RD RT531
CrossesPassaic River
Location1.50 MI N of I-78
RouteCounty Highway 531
CountySomerset County
StateNew Jersey
Coordinates40.67047, -74.46431
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating83 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length86 ft (26.2 m)
Longest span43 ft (13.1 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,560 (2023)
Projected traffic12,885 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Hillcrest RD RT531 over Passaic River built?

It was built in 1998, making it 27 years old in 2025.

What condition is Hillcrest RD RT531 over Passaic River 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 Hillcrest RD RT531 over Passaic River carry?

About 10,560 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Hillcrest RD RT531 over Passaic River?

The structure is 86 ft (26.2 m) long with a longest span of 43 ft (13.1 m) and a deck 44 ft wide.

Who owns Hillcrest RD RT531 over Passaic River?

It is owned by the County Highway Agency.