US Bridges

Grandview Road over Rock Brook

Fair

Somerset County, New Jersey · Hollow RD Intersection · Structure no. 18C0305

Built
1920
105 years old, rebuilt 1981
Condition
Fair
inspected September 2023
Type
Slab
Wood or Timber
Length
37 ft
1 main span
Daily traffic
775
2023 count
Owner
County
County Highway Agency

About this bridge

Grandview Road over Rock Brook is a wood or timber slab carrying Grandview Road over Rock Brook in Somerset County, New Jersey. It was built in 1920 and reconstructed in 1981, so it is 105 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 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 775 vehicles a day, roughly 3% of them trucks, projected to reach 930 by 2043. The structure is 37 ft (11.3 m) long and 17 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesGrandview Road
CrossesRock Brook
LocationHollow RD Intersection
CountySomerset County
StateNew Jersey
Coordinates40.43077, -74.7278
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating59 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span35 ft (10.7 m)
Deck width17 ft (5.2 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic775 (2023)
Projected traffic930 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$673,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Grandview Road over Rock Brook built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1981.

What condition is Grandview Road over Rock 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 September 2023.

How much traffic does Grandview Road over Rock Brook carry?

About 775 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Grandview Road over Rock Brook?

The structure is 37 ft (11.3 m) long with a longest span of 35 ft (10.7 m) and a deck 17 ft wide.

Who owns Grandview Road over Rock Brook?

It is owned by the County Highway Agency.