US Bridges

Grandview RD over Rock Brook

Fair

Somerset County, New Jersey · 400 Ft. E. of Hollow Rd. · Structure no. 18C0306

Built
1930
95 years old, rebuilt 1986
Condition
Fair
inspected September 2023
Type
Slab
Wood or Timber
Length
31 ft
1 main span
Daily traffic
775
2023 count
Owner
County
County Highway Agency

About this bridge

Grandview RD over Rock Brook is a wood or timber slab carrying Grandview RD over Rock Brook in Somerset County, New Jersey. It was built in 1930 and reconstructed in 1986, so it is 95 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 31 ft (9.4 m) long and 18 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesGrandview RD
CrossesRock Brook
Location400 Ft. E. of Hollow Rd.
CountySomerset County
StateNew Jersey
Coordinates40.43158, -74.72706
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 alignment6: Equal to present minimum criteria
Operating rating96 US tons
Inventory rating71 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width18 ft (5.4 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deck100 ft (30.5 m)

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$568,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Grandview RD over Rock Brook built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1986.

What condition is Grandview RD 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 RD over Rock Brook carry?

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

How long is Grandview RD over Rock Brook?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 18 ft wide.

Who owns Grandview RD over Rock Brook?

It is owned by the County Highway Agency.