US Bridges

Hawthorne Avenue over Trib Green Brook

Good

Somerset County, New Jersey · 0.05 MI E of Mountain Ave · Structure no. 18H0814

Built
2020
5 years old
Condition
Good
inspected September 2023
Type
Frame
Concrete
Length
22 ft
1 main span
Daily traffic
326
2023 count
Owner
County
County Highway Agency

About this bridge

Hawthorne Avenue over Trib Green Brook is a concrete frame carrying Hawthorne Avenue over Trib Green Brook in Somerset County, New Jersey. It was built in 2020, so it is 5 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 good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 326 vehicles a day, roughly 1% of them trucks, projected to reach 391 by 2043. The structure is 22 ft (6.7 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesHawthorne Avenue
CrossesTrib Green Brook
Location0.05 MI E of Mountain Ave
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.57165, -74.5277
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating42.9 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width44 ft (13.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic326 (2023)
Projected traffic391 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Hawthorne Avenue over Trib Green Brook built?

It was built in 2020, making it 5 years old in 2025.

What condition is Hawthorne Avenue over Trib Green Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Hawthorne Avenue over Trib Green Brook carry?

About 326 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Hawthorne Avenue over Trib Green Brook?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 44 ft wide.

Who owns Hawthorne Avenue over Trib Green Brook?

It is owned by the County Highway Agency.