US Bridges

Spring Street over Ross Brook

Fair

Somerset County, New Jersey · 0.06 MI East of Grove ST · Structure no. 18F0811

Built
1931
94 years old
Condition
Fair
inspected September 2023
Type
Frame
Concrete
Length
23 ft
1 main span
Daily traffic
3,289
2023 count
Owner
County
County Highway Agency

About this bridge

Spring Street over Ross Brook is a concrete frame carrying Spring Street over Ross Brook in Somerset County, New Jersey. It was built in 1931, so it is 94 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 3,289 vehicles a day, roughly 1% of them trucks, projected to reach 3,947 by 2043. The structure is 23 ft (7 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSpring Street
CrossesRoss Brook
Location0.06 MI East of Grove ST
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.5747, -74.60648
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating27.4 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width50 ft (15.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,289 (2023)
Projected traffic3,947 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 Spring Street over Ross Brook built?

It was built in 1931, making it 94 years old in 2025.

What condition is Spring 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 Spring Street over Ross Brook carry?

About 3,289 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Spring Street over Ross Brook?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m) and a deck 50 ft wide.

Who owns Spring Street over Ross Brook?

It is owned by the County Highway Agency.