US Bridges

Oak Tree Road over Gsp

Fair

Middlesex County, New Jersey · 0.23 MI North of Nj 27 · Structure no. 361322T

Built
1948
77 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
199 ft
2 main spans
Daily traffic
15,666
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Oak Tree Road over Gsp is a steel continuous stringer/multi-beam or girder carrying Oak Tree Road over Gsp 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 15,666 vehicles a day, roughly 1% of them trucks, projected to reach 19,116 by 2043. The structure is 199 ft (60.7 m) long and 56 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesOak Tree Road
CrossesGsp
Location0.23 MI North of Nj 27
RouteCounty Highway 604
CountyMiddlesex County
StateNew Jersey
Coordinates40.57334, -74.32998
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating34.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length199 ft (60.7 m)
Longest span97 ft (29.6 m)
Deck width56 ft (17.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,666 (2023)
Projected traffic19,116 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed11.8 mi (19 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Oak Tree Road over Gsp built?

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

What condition is Oak Tree Road over Gsp 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 June 2023.

How much traffic does Oak Tree Road over Gsp carry?

About 15,666 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Oak Tree Road over Gsp?

The structure is 199 ft (60.7 m) long with a longest span of 97 ft (29.6 m) and a deck 56 ft wide.

Who owns Oak Tree Road over Gsp?

It is owned by the State Toll Authority.