US Bridges

Hamilton Road over Royce Brook

Fair

Somerset County, New Jersey · .83 MI East of Rt 206 · Structure no. 18F0507

Built
1978
47 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
2,617
2023 count
Owner
County
County Highway Agency

About this bridge

Hamilton Road over Royce Brook is a prestressed concrete box beam or girders - multiple carrying Hamilton Road over Royce Brook in Somerset County, New Jersey. It was built in 1978, so it is 47 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 5 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 2,617 vehicles a day, roughly 3% of them trucks, projected to reach 3,140 by 2043. The structure is 67 ft (20.4 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHamilton Road
CrossesRoyce Brook
Location.83 MI East of Rt 206
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.50595, -74.62354
Functional classUrban Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating41 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length67 ft (20.4 m)
Longest span63 ft (19.2 m)
Deck width50 ft (15.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,617 (2023)
Projected traffic3,140 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$459,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Hamilton Road over Royce Brook built?

It was built in 1978, making it 47 years old in 2025.

What condition is Hamilton Road over Royce 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 Hamilton Road over Royce Brook carry?

About 2,617 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Hamilton Road over Royce Brook?

The structure is 67 ft (20.4 m) long with a longest span of 63 ft (19.2 m) and a deck 50 ft wide.

Who owns Hamilton Road over Royce Brook?

It is owned by the County Highway Agency.