US Bridges

County Route 523 over South Branch Raritan Riv

Fair

Hunterdon County, New Jersey · 0.57 MI North of CR 612 · Structure no. 1000018

Built
1968
57 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
269 ft
3 main spans
Daily traffic
9,998
2023 count
Owner
County
County Highway Agency

About this bridge

County Route 523 over South Branch Raritan Riv is a steel stringer/multi-beam or girder carrying County Route 523 over South Branch Raritan Riv in Hunterdon County, New Jersey. It was built in 1968, so it is 57 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 9,998 vehicles a day, roughly 4% of them trucks, projected to reach 12,199 by 2043. The structure is 269 ft (82 m) long and 38 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesCounty Route 523
CrossesSouth Branch Raritan Riv
Location0.57 MI North of CR 612
RouteCounty Highway 523
CountyHunterdon County
StateNew Jersey
Coordinates40.53784, -74.83574
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length269 ft (82 m)
Longest span89 ft (27.1 m)
Deck width38 ft (11.6 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,998 (2023)
Projected traffic12,199 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 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 County Route 523 over South Branch Raritan Riv built?

It was built in 1968, making it 57 years old in 2025.

What condition is County Route 523 over South Branch Raritan Riv 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 March 2023.

How much traffic does County Route 523 over South Branch Raritan Riv carry?

About 9,998 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is County Route 523 over South Branch Raritan Riv?

The structure is 269 ft (82 m) long with a longest span of 89 ft (27.1 m) and a deck 38 ft wide.

Who owns County Route 523 over South Branch Raritan Riv?

It is owned by the County Highway Agency.