US Bridges

Stirling Road over Stony Brook

Fair

Somerset County, New Jersey · 0.88 MI S of I-78 · Structure no. 18L1013

Built
2002
23 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
67 ft
1 main span
Daily traffic
9,945
2023 count
Owner
County
County Highway Agency

About this bridge

Stirling Road over Stony Brook is a steel stringer/multi-beam or girder carrying Stirling Road over Stony Brook in Somerset County, New Jersey. It was built in 2002, so it is 23 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 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 9,945 vehicles a day, roughly 4% of them trucks, projected to reach 12,135 by 2043. The structure is 67 ft (20.4 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesStirling Road
CrossesStony Brook
Location0.88 MI S of I-78
RouteCounty Highway 653
CountySomerset County
StateNew Jersey
Coordinates40.6402, -74.468
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating87 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length67 ft (20.4 m)
Longest span50 ft (15.2 m)
Deck width38 ft (11.6 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,945 (2023)
Projected traffic12,135 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stirling Road over Stony Brook built?

It was built in 2002, making it 23 years old in 2025.

What condition is Stirling Road over Stony Brook 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 September 2023.

How much traffic does Stirling Road over Stony Brook carry?

About 9,945 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Stirling Road over Stony Brook?

The structure is 67 ft (20.4 m) long with a longest span of 50 ft (15.2 m) and a deck 38 ft wide.

Who owns Stirling Road over Stony Brook?

It is owned by the County Highway Agency.