US Bridges

Disbrow Hill Road over Rocky Brook

Good

Mercer County, New Jersey · 0.68 MI East of Rt 571 · Structure no. 1108639

Built
1980
45 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete
Length
22 ft
1 main span
Daily traffic
1,598
2023 count
Owner
County
County Highway Agency

About this bridge

Disbrow Hill Road over Rocky Brook is a concrete culvert carrying Disbrow Hill Road over Rocky Brook in Mercer County, New Jersey. It was built in 1980, so it is 45 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,598 vehicles a day, roughly 1% of them trucks, projected to reach 1,941 by 2043. The structure is 22 ft (6.7 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesDisbrow Hill Road
CrossesRocky Brook
Location0.68 MI East of Rt 571
RouteCity Street 0
CountyMercer County
StateNew Jersey
Coordinates40.25306, -74.48749
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum 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 rating56 US tons
Inventory rating33 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width33 ft (10.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,598 (2023)
Projected traffic1,941 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Disbrow Hill Road over Rocky Brook built?

It was built in 1980, making it 45 years old in 2025.

What condition is Disbrow Hill Road over Rocky 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 February 2023.

How much traffic does Disbrow Hill Road over Rocky Brook carry?

About 1,598 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Disbrow Hill Road over Rocky Brook?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 33 ft wide.

Who owns Disbrow Hill Road over Rocky Brook?

It is owned by the County Highway Agency.