US Bridges

Somerset Street over Green Brook

Fair

Somerset County, New Jersey · 1.02 MI S of US 22 · Structure no. 18M1002

Built
1889
136 years old, rebuilt 1963
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
9,189
2023 count
Owner
County
County Highway Agency

About this bridge

Somerset Street over Green Brook is a prestressed concrete box beam or girders - multiple carrying Somerset Street over Green Brook in Somerset County, New Jersey. It was built in 1889 and reconstructed in 1963, so it is 136 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 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 9,189 vehicles a day, roughly 4% of them trucks, projected to reach 11,212 by 2043. The structure is 52 ft (15.8 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSomerset Street
CrossesGreen Brook
Location1.02 MI S of US 22
RouteCounty Highway 531
Coordinates40.61907, -74.42493
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37 US tons
Inventory rating22 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span49 ft (14.9 m)
Deck width64 ft (19.5 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,189 (2023)
Projected traffic11,212 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 Somerset Street over Green Brook built?

It was built in 1889, making it 136 years old in 2025. It was reconstructed in 1963.

What condition is Somerset Street over Green 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 Somerset Street over Green Brook carry?

About 9,189 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Somerset Street over Green Brook?

The structure is 52 ft (15.8 m) long with a longest span of 49 ft (14.9 m) and a deck 64 ft wide.

Who owns Somerset Street over Green Brook?

It is owned by the County Highway Agency.