US Bridges

Hollow Road over Trib to Rock Brook

Good

Somerset County, New Jersey · 1.75 MI North of CR 518 · Structure no. 18C0302

Built
2019
6 years old
Condition
Good
inspected September 2023
Type
Frame
Concrete
Length
42 ft
1 main span
Daily traffic
2,388
2023 count
Owner
County
County Highway Agency

About this bridge

Hollow Road over Trib to Rock Brook is a concrete frame carrying Hollow Road over Trib to Rock Brook in Somerset County, New Jersey. It was built in 2019, so it is 6 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,388 vehicles a day, roughly 3% of them trucks, projected to reach 2,865 by 2043. The structure is 42 ft (12.8 m) long and 37 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesHollow Road
CrossesTrib to Rock Brook
Location1.75 MI North of CR 518
CountySomerset County
StateNew Jersey
Coordinates40.42899, -74.7261
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
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 evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating53.2 US tons
Inventory rating41.1 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length42 ft (12.8 m)
Longest span37 ft (11.3 m)
Deck width37 ft (11.2 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,388 (2023)
Projected traffic2,865 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Hollow Road over Trib to Rock Brook built?

It was built in 2019, making it 6 years old in 2025.

What condition is Hollow Road over Trib to Rock 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 Hollow Road over Trib to Rock Brook carry?

About 2,388 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Hollow Road over Trib to Rock Brook?

The structure is 42 ft (12.8 m) long with a longest span of 37 ft (11.3 m) and a deck 37 ft wide.

Who owns Hollow Road over Trib to Rock Brook?

It is owned by the County Highway Agency.