US Bridges

Main St. (cr 670) over Gsp-Nbo Nbi Sbi &sbo

Fair

Middlesex County, New Jersey · 0.9 MI S of Raritan Toll · Structure no. 361250T

Built
1954
71 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
404 ft
7 main spans
Daily traffic
12,303
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Main St. (cr 670) over Gsp-Nbo Nbi Sbi &sbo is a steel stringer/multi-beam or girder carrying Main St. (cr 670) over Gsp-Nbo Nbi Sbi &sbo in Middlesex County, New Jersey. It was built in 1954, so it is 71 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 12,303 vehicles a day, roughly 3% of them trucks, projected to reach 15,012 by 2043. The structure is 404 ft (123.1 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMain St. (cr 670)
CrossesGsp-Nbo Nbi Sbi &sbo
Location0.9 MI S of Raritan Toll
RouteCounty Highway 670
CountyMiddlesex County
StateNew Jersey
Coordinates40.47647, -74.29938
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.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating51.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length404 ft (123.1 m)
Longest span54 ft (16.5 m)
Deck width44 ft (13.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,303 (2023)
Projected traffic15,012 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Main St. (cr 670) over Gsp-Nbo Nbi Sbi &sbo built?

It was built in 1954, making it 71 years old in 2025.

What condition is Main St. (cr 670) over Gsp-Nbo Nbi Sbi &sbo 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 Main St. (cr 670) over Gsp-Nbo Nbi Sbi &sbo carry?

About 12,303 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Main St. (cr 670) over Gsp-Nbo Nbi Sbi &sbo?

The structure is 404 ft (123.1 m) long with a longest span of 54 ft (16.5 m) and a deck 44 ft wide.

Who owns Main St. (cr 670) over Gsp-Nbo Nbi Sbi &sbo?

It is owned by the State Toll Authority.