US Bridges

County Route 523 over Second Neshanic River

Fair

Hunterdon County, New Jersey · 1.41 MI SW of JCT Nj 12 · Structure no. 1000035

Built
1923
102 years old, rebuilt 1991
Condition
Fair
inspected March 2023
Type
Slab
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
7,887
2023 count
Owner
County
County Highway Agency

About this bridge

County Route 523 over Second Neshanic River is a prestressed concrete slab carrying County Route 523 over Second Neshanic River in Hunterdon County, New Jersey. It was built in 1923 and reconstructed in 1991, so it is 102 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 7,887 vehicles a day, roughly 3% of them trucks, projected to reach 9,624 by 2043. The structure is 30 ft (9.1 m) long and 50 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty Route 523
CrossesSecond Neshanic River
Location1.41 MI SW of JCT Nj 12
RouteCounty Highway 523
CountyHunterdon County
StateNew Jersey
Coordinates40.49252, -74.89106
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating45 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length30 ft (9.1 m)
Longest span28 ft (8.5 m)
Deck width50 ft (15.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,887 (2023)
Projected traffic9,624 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Route 523 over Second Neshanic River built?

It was built in 1923, making it 102 years old in 2025. It was reconstructed in 1991.

What condition is County Route 523 over Second Neshanic 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 March 2023.

How much traffic does County Route 523 over Second Neshanic River carry?

About 7,887 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is County Route 523 over Second Neshanic River?

The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.5 m) and a deck 50 ft wide.

Who owns County Route 523 over Second Neshanic River?

It is owned by the County Highway Agency.