US Bridges

Nj 31 over Raritan Valley Line

Good

Hunterdon County, New Jersey · 0.3 MI N of Main Street · Structure no. 1013158

Built
2013
12 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
92 ft
1 main span
Daily traffic
21,865
2022 count
Owner
State
State Highway Agency

About this bridge

Nj 31 over Raritan Valley Line is a steel stringer/multi-beam or girder carrying Nj 31 over Raritan Valley Line in Hunterdon County, New Jersey. It was built in 2013, so it is 12 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 21,865 vehicles a day, roughly 4% of them trucks, projected to reach 26,165 by 2042. The structure is 92 ft (28 m) long and 77 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNj 31
CrossesRaritan Valley Line
Location0.3 MI N of Main Street
RouteState Highway 31
Coordinates40.70962, -74.95025
Functional classUrban Other Principal Arterial

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.
Substructure8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.7 US tons
Inventory rating36.4 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length92 ft (28 m)
Longest span88 ft (26.8 m)
Deck width77 ft (23.5 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,865 (2022)
Projected traffic26,165 by 2042
Trucks4%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Nj 31 over Raritan Valley Line built?

It was built in 2013, making it 12 years old in 2025.

What condition is Nj 31 over Raritan Valley Line 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 August 2024.

How much traffic does Nj 31 over Raritan Valley Line carry?

About 21,865 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Nj 31 over Raritan Valley Line?

The structure is 92 ft (28 m) long with a longest span of 88 ft (26.8 m) and a deck 77 ft wide.

Who owns Nj 31 over Raritan Valley Line?

It is owned by the State Highway Agency.