US Bridges

Main Street over Gsp & Njtpk

Fair

Middlesex County, New Jersey · 0.95 MI N of US Route 9 · Structure no. M09023A

Built
1949
76 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
463 ft
4 main spans
Daily traffic
16,865
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Main Street over Gsp & Njtpk is a steel continuous stringer/multi-beam or girder carrying Main Street over Gsp & Njtpk in Middlesex County, New Jersey. It was built in 1949, so it is 76 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 5 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 16,865 vehicles a day, roughly 4% of them trucks, projected to reach 20,579 by 2043. The structure is 463 ft (141.1 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMain Street
CrossesGsp & Njtpk
Location0.95 MI N of US Route 9
RouteCounty Highway 514
CountyMiddlesex County
StateNew Jersey
Coordinates40.54069, -74.30866
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length463 ft (141.1 m)
Longest span153 ft (46.6 m)
Deck width53 ft (16.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,865 (2023)
Projected traffic20,579 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free 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$10.4 million (2017 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Main Street over Gsp & Njtpk built?

It was built in 1949, making it 76 years old in 2025.

What condition is Main Street over Gsp & Njtpk 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 May 2023.

How much traffic does Main Street over Gsp & Njtpk carry?

About 16,865 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Main Street over Gsp & Njtpk?

The structure is 463 ft (141.1 m) long with a longest span of 153 ft (46.6 m) and a deck 53 ft wide.

Who owns Main Street over Gsp & Njtpk?

It is owned by the State Toll Authority.