US Bridges

Rock Road over Peters Brook

Fair

Hunterdon County, New Jersey · 0.55 MI West of CR 579 · Structure no. 100W069

Built
1996
29 years old
Condition
Fair
inspected March 2023
Type
Slab
Prestressed Concrete
Length
38 ft
1 main span
Daily traffic
244
2023 count
Owner
County
County Highway Agency

About this bridge

Rock Road over Peters Brook is a prestressed concrete slab carrying Rock Road over Peters Brook in Hunterdon County, New Jersey. It was built in 1996, so it is 29 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 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 244 vehicles a day, roughly 3% of them trucks, projected to reach 293 by 2043. The structure is 38 ft (11.6 m) long and 30 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesRock Road
CrossesPeters Brook
Location0.55 MI West of CR 579
CountyHunterdon County
StateNew Jersey
Coordinates40.38194, -74.8566
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum 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 alignment6: Equal to present minimum criteria
Operating rating99 US tons
Inventory rating78 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length38 ft (11.6 m)
Longest span35 ft (10.7 m)
Deck width30 ft (9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic244 (2023)
Projected traffic293 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Rock Road over Peters Brook built?

It was built in 1996, making it 29 years old in 2025.

What condition is Rock Road over Peters 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 March 2023.

How much traffic does Rock Road over Peters Brook carry?

About 244 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Rock Road over Peters Brook?

The structure is 38 ft (11.6 m) long with a longest span of 35 ft (10.7 m) and a deck 30 ft wide.

Who owns Rock Road over Peters Brook?

It is owned by the County Highway Agency.