US Bridges

CR.531(HILLCR.RD) over I-78

Fair

Somerset County, New Jersey · 3.59 MI E of I-78 Ext 36 · Structure no. 1817177

Built
1966
59 years old, rebuilt 1986
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
245 ft
4 main spans
Daily traffic
17,506
2023 count
Owner
State
State Highway Agency

About this bridge

CR.531(HILLCR.RD) over I-78 is a prestressed concrete stringer/multi-beam or girder carrying CR.531(HILLCR.RD) over I-78 in Somerset County, New Jersey. It was built in 1966 and reconstructed in 1986, so it is 59 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 17,506 vehicles a day, roughly 4% of them trucks, projected to reach 21,360 by 2043. The structure is 245 ft (74.7 m) long and 71 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCR.531(HILLCR.RD)
CrossesI-78
Location3.59 MI E of I-78 Ext 36
RouteCounty Highway 531
CountySomerset County
StateNew Jersey
Coordinates40.65135, -74.45448
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
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 inspectionDecember 2024
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 alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length245 ft (74.7 m)
Longest span93 ft (28.3 m)
Deck width71 ft (21.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,506 (2023)
Projected traffic21,360 by 2043
Trucks4%
Lanes on structure4
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 statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$3.7 million (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was CR.531(HILLCR.RD) over I-78 built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1986.

What condition is CR.531(HILLCR.RD) over I-78 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 December 2024.

How much traffic does CR.531(HILLCR.RD) over I-78 carry?

About 17,506 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is CR.531(HILLCR.RD) over I-78?

The structure is 245 ft (74.7 m) long with a longest span of 93 ft (28.3 m) and a deck 71 ft wide.

Who owns CR.531(HILLCR.RD) over I-78?

It is owned by the State Highway Agency.