US Bridges

Green Brook RD over Stony Brook

Fair

Somerset County, New Jersey · 0.2 MI W of CR 531S · Structure no. 18M1004

Built
1973
52 years old, rebuilt 1979
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
8,990
2023 count
Owner
County
County Highway Agency

About this bridge

Green Brook RD over Stony Brook is a prestressed concrete box beam or girders - multiple carrying Green Brook RD over Stony Brook in Somerset County, New Jersey. It was built in 1973 and reconstructed in 1979, so it is 52 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 8,990 vehicles a day, roughly 4% of them trucks, projected to reach 10,970 by 2043. The structure is 51 ft (15.5 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGreen Brook RD
CrossesStony Brook
Location0.2 MI W of CR 531S
RouteCounty Highway 636
CountySomerset County
StateNew Jersey
Coordinates40.62209, -74.43611
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating18 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span48 ft (14.6 m)
Deck width48 ft (14.7 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,990 (2023)
Projected traffic10,970 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Green Brook RD over Stony Brook built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1979.

What condition is Green Brook RD 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 October 2023.

How much traffic does Green Brook RD over Stony Brook carry?

About 8,990 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Green Brook RD over Stony Brook?

The structure is 51 ft (15.5 m) long with a longest span of 48 ft (14.6 m) and a deck 48 ft wide.

Who owns Green Brook RD over Stony Brook?

It is owned by the County Highway Agency.