US Bridges

Grove Street over Green Brook

Fair

Somerset County, New Jersey · 250 Ft N of W. Front ST · Structure no. 18M0906

Built
1916
109 years old
Condition
Fair
inspected October 2023
Type
Arch - Deck
Concrete
Length
52 ft
1 main span
Daily traffic
9,245
2023 count
Owner
County
County Highway Agency

About this bridge

Grove Street over Green Brook is a concrete arch - deck carrying Grove Street over Green Brook in Somerset County, New Jersey. It was built in 1916, so it is 109 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 9,245 vehicles a day, roughly 1% of them trucks, projected to reach 11,281 by 2043. The structure is 52 ft (15.8 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesGrove Street
CrossesGreen Brook
Location250 Ft N of W. Front ST
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.61714, -74.42695
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39 US tons
Inventory rating23 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 20
Structure length52 ft (15.8 m)
Longest span52 ft (15.8 m)
Deck width60 ft (18.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,245 (2023)
Projected traffic11,281 by 2043
Trucks1%
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 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 Grove Street over Green Brook built?

It was built in 1916, making it 109 years old in 2025.

What condition is Grove 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 Grove Street over Green Brook carry?

About 9,245 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Grove Street over Green Brook?

The structure is 52 ft (15.8 m) long with a longest span of 52 ft (15.8 m) and a deck 60 ft wide.

Who owns Grove Street over Green Brook?

It is owned by the County Highway Agency.