US Bridges

South St-Cr 647 over Central Br. Salt Brook

Fair

Union County, New Jersey · 1.5 MI South of I-78 · Structure no. 2011039

Built
1928
97 years old, rebuilt 1984
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
38 ft
1 main span
Daily traffic
14,528
2024 count
Owner
County
County Highway Agency

About this bridge

South St-Cr 647 over Central Br. Salt Brook is a concrete slab carrying South St-Cr 647 over Central Br. Salt Brook in Union County, New Jersey. It was built in 1928 and reconstructed in 1984, so it is 97 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 14,528 vehicles a day, roughly 4% of them trucks, projected to reach 17,727 by 2044. The structure is 38 ft (11.6 m) long and 65 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSouth St-Cr 647
CrossesCentral Br. Salt Brook
Location1.5 MI South of I-78
RouteCounty Highway 647
CountyUnion County
StateNew Jersey
Coordinates40.6993, -74.40185
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 protection7 GoodSome minor problems.
Last inspectionMarch 2024
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 alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating72 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length38 ft (11.6 m)
Longest span30 ft (9.1 m)
Deck width65 ft (19.7 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,528 (2024)
Projected traffic17,727 by 2044
Trucks4%
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 South St-Cr 647 over Central Br. Salt Brook built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1984.

What condition is South St-Cr 647 over Central Br. Salt Brook 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 2024.

How much traffic does South St-Cr 647 over Central Br. Salt Brook carry?

About 14,528 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is South St-Cr 647 over Central Br. Salt Brook?

The structure is 38 ft (11.6 m) long with a longest span of 30 ft (9.1 m) and a deck 65 ft wide.

Who owns South St-Cr 647 over Central Br. Salt Brook?

It is owned by the County Highway Agency.