US Bridges

Gsp NB Inner over Ernston Road

Fair

Middlesex County, New Jersey · 2.5 MI S of Raritan Toll · Structure no. 361236I

Built
1972
53 years old
Condition
Fair
inspected February 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
115 ft
3 main spans
Daily traffic
38,067
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Gsp NB Inner over Ernston Road is a prestressed concrete box beam or girders - single or spread carrying Gsp NB Inner over Ernston Road in Middlesex County, New Jersey. It was built in 1972, so it is 53 years old, younger 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 38,067 vehicles a day, roughly 1% of them trucks, projected to reach 53,575 by 2043. The structure is 115 ft (35.1 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGsp NB Inner
CrossesErnston Road
Location2.5 MI S of Raritan Toll
CountyMiddlesex County
StateNew Jersey
Coordinates40.46132, -74.28061
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating34.3 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length115 ft (35.1 m)
Longest span52 ft (15.8 m)
Deck width52 ft (16 m)
Roadway width50 ft (15.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,067 (2023)
Projected traffic53,575 by 2043
Trucks1%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

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 Gsp NB Inner over Ernston Road built?

It was built in 1972, making it 53 years old in 2025.

What condition is Gsp NB Inner over Ernston Road 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 February 2023.

How much traffic does Gsp NB Inner over Ernston Road carry?

About 38,067 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Gsp NB Inner over Ernston Road?

The structure is 115 ft (35.1 m) long with a longest span of 52 ft (15.8 m) and a deck 52 ft wide.

Who owns Gsp NB Inner over Ernston Road?

It is owned by the State Toll Authority.