US Bridges

Gsp NB & SB over Mill Road

Fair

Union County, New Jersey · 0.4 MI NE of GSP&I-78 JCT · Structure no. 361432T

Built
1953
72 years old, rebuilt 2018
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
73 ft
1 main span
Daily traffic
149,891
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Gsp NB & SB over Mill Road is a steel stringer/multi-beam or girder carrying Gsp NB & SB over Mill Road in Union County, New Jersey. It was built in 1953 and reconstructed in 2018, so it is 72 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 149,891 vehicles a day, roughly 1% of them trucks, projected to reach 251,112 by 2043. The structure is 73 ft (22.3 m) long and 147 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGsp NB & SB
CrossesMill Road
Location0.4 MI NE of GSP&I-78 JCT
CountyUnion County
StateNew Jersey
Coordinates40.71117, -74.24407
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.2 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, precast panels
Main spans1
Design loadH 20
Structure length73 ft (22.3 m)
Longest span69 ft (21 m)
Deck width147 ft (44.7 m)
Roadway width138 ft (42 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic149,891 (2023)
Projected traffic251,112 by 2043
Trucks1%
Lanes on structure9
Traffic directionTwo-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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Gsp NB & SB over Mill Road built?

It was built in 1953, making it 72 years old in 2025. It was reconstructed in 2018.

What condition is Gsp NB & SB over Mill 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 July 2023.

How much traffic does Gsp NB & SB over Mill Road carry?

About 149,891 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Gsp NB & SB over Mill Road?

The structure is 73 ft (22.3 m) long with a longest span of 69 ft (21 m) and a deck 147 ft wide.

Who owns Gsp NB & SB over Mill Road?

It is owned by the State Toll Authority.