US Bridges

Duer Street over Crab Brook

Fair

Somerset County, New Jersey · 0.1 MI No Greenbrook RD · Structure no. 18M1021

Built
1975
50 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
1,214
2023 count
Owner
County
County Highway Agency

About this bridge

Duer Street over Crab Brook is a concrete culvert carrying Duer Street over Crab Brook in Somerset County, New Jersey. It was built in 1975, so it is 50 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 1,214 vehicles a day, roughly 1% of them trucks, projected to reach 1,456 by 2043. The structure is 24 ft (7.3 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesDuer Street
CrossesCrab Brook
Location0.1 MI No Greenbrook RD
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.6238, -74.43605
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 rating30 US tons
Inventory rating18 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width50 ft (15.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,214 (2023)
Projected traffic1,456 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 Duer Street over Crab Brook built?

It was built in 1975, making it 50 years old in 2025.

What condition is Duer Street over Crab 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 Duer Street over Crab Brook carry?

About 1,214 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Duer Street over Crab Brook?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 50 ft wide.

Who owns Duer Street over Crab Brook?

It is owned by the County Highway Agency.