US Bridges

Willow Avenue over North Br Raritan River

Fair

Somerset County, New Jersey · 0.1 MI We of Campbell RD · Structure no. 18E1307

Built
1918
107 years old, rebuilt 1984
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
63 ft
2 main spans
Daily traffic
647
2023 count
Owner
County
County Highway Agency

About this bridge

Willow Avenue over North Br Raritan River is a wood or timber stringer/multi-beam or girder carrying Willow Avenue over North Br Raritan River in Somerset County, New Jersey. It was built in 1918 and reconstructed in 1984, so it is 107 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 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 647 vehicles a day, roughly 1% of them trucks, projected to reach 777 by 2043. The structure is 63 ft (19.2 m) long and 21 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesWillow Avenue
CrossesNorth Br Raritan River
Location0.1 MI We of Campbell RD
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.72108, -74.63903
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating74 US tons
Inventory rating53 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span31 ft (9.4 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic647 (2023)
Projected traffic777 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$648,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Willow Avenue over North Br Raritan River built?

It was built in 1918, making it 107 years old in 2025. It was reconstructed in 1984.

What condition is Willow Avenue over North Br Raritan 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 October 2023.

How much traffic does Willow Avenue over North Br Raritan River carry?

About 647 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Willow Avenue over North Br Raritan River?

The structure is 63 ft (19.2 m) long with a longest span of 31 ft (9.4 m) and a deck 21 ft wide.

Who owns Willow Avenue over North Br Raritan River?

It is owned by the County Highway Agency.