US Bridges

William Street over Ross Brook

Fair

Somerset County, New Jersey · 0.1 MI East of Grove St. · Structure no. 18F0810

Built
1928
97 years old
Condition
Fair
inspected September 2023
Type
Arch - Deck
Concrete
Length
34 ft
1 main span
Daily traffic
3,908
2023 count
Owner
County
County Highway Agency

About this bridge

William Street over Ross Brook is a concrete arch - deck carrying William Street over Ross Brook in Somerset County, New Jersey. It was built in 1928, so it is 97 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 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 3,908 vehicles a day, roughly 1% of them trucks, projected to reach 4,690 by 2043. The structure is 34 ft (10.4 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesWilliam Street
CrossesRoss Brook
Location0.1 MI East of Grove St.
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.57281, -74.6068
Functional classUrban 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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85 US tons
Inventory rating51 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 20
Structure length34 ft (10.4 m)
Longest span30 ft (9.1 m)
Deck width54 ft (16.5 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,908 (2023)
Projected traffic4,690 by 2043
Trucks1%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was William Street over Ross Brook built?

It was built in 1928, making it 97 years old in 2025.

What condition is William Street over Ross 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 William Street over Ross Brook carry?

About 3,908 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is William Street over Ross Brook?

The structure is 34 ft (10.4 m) long with a longest span of 30 ft (9.1 m) and a deck 54 ft wide.

Who owns William Street over Ross Brook?

It is owned by the County Highway Agency.