US Bridges

Gsp NB over US Route 9 SB

Fair

Middlesex County, New Jersey · 1.92 MI South of US 1 · Structure no. 361288A

Built
1948
77 years old
Condition
Fair
inspected March 2023
Type
Girder and Floorbeam System
Steel
Length
253 ft
3 main spans
Daily traffic
21,281
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Gsp NB over US Route 9 SB is a steel girder and floorbeam system carrying Gsp NB over US Route 9 SB in Middlesex County, New Jersey. It was built in 1948, so it is 77 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 21,281 vehicles a day, roughly 1% of them trucks, projected to reach 52,427 by 2043. The structure is 253 ft (77.1 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGsp NB
CrossesUS Route 9 SB
Location1.92 MI South of US 1
CountyMiddlesex County
StateNew Jersey
Coordinates40.53093, -74.29787
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length253 ft (77.1 m)
Longest span126 ft (38.4 m)
Deck width51 ft (15.6 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,281 (2023)
Projected traffic52,427 by 2043
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Gsp NB over US Route 9 SB built?

It was built in 1948, making it 77 years old in 2025.

What condition is Gsp NB over US Route 9 SB 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 Gsp NB over US Route 9 SB carry?

About 21,281 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Gsp NB over US Route 9 SB?

The structure is 253 ft (77.1 m) long with a longest span of 126 ft (38.4 m) and a deck 51 ft wide.

Who owns Gsp NB over US Route 9 SB?

It is owned by the State Toll Authority.