US Bridges

County Rt 518 over Delaware & Raritan Canal

Good

Somerset County, New Jersey · 1.3 MI E of Rt 206 JCT · Structure no. 3000159

Built
2017
8 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
57 ft
1 main span
Daily traffic
9,078
2023 count
Owner
State
Other State Agency

About this bridge

County Rt 518 over Delaware & Raritan Canal is a prestressed concrete box beam or girders - multiple carrying County Rt 518 over Delaware & Raritan Canal in Somerset County, New Jersey. It was built in 2017, so it is 8 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 9,078 vehicles a day, roughly 4% of them trucks, projected to reach 11,077 by 2043. The structure is 57 ft (17.4 m) long and 45 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Rt 518
CrossesDelaware & Raritan Canal
Location1.3 MI E of Rt 206 JCT
RouteCounty Highway 518
CountySomerset County
StateNew Jersey
Coordinates40.39931, -74.62776
Functional classUrban Minor 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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length57 ft (17.4 m)
Longest span54 ft (16.5 m)
Deck width45 ft (13.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,078 (2023)
Projected traffic11,077 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther State Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.3 million
NavigationNo navigation control on waterway

Frequently asked questions

When was County Rt 518 over Delaware & Raritan Canal built?

It was built in 2017, making it 8 years old in 2025.

What condition is County Rt 518 over Delaware & Raritan Canal 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 May 2023.

How much traffic does County Rt 518 over Delaware & Raritan Canal carry?

About 9,078 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is County Rt 518 over Delaware & Raritan Canal?

The structure is 57 ft (17.4 m) long with a longest span of 54 ft (16.5 m) and a deck 45 ft wide.

Who owns County Rt 518 over Delaware & Raritan Canal?

It is owned by the Other State Agency and maintained by the State Highway Agency.