US Bridges

Plainfield Avenue over Green Brook

Fair

Union County, New Jersey · At Somerset County Line · Structure no. 2001051

Built
1967
58 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
23,551
2024 count
Owner
County
County Highway Agency

About this bridge

Plainfield Avenue over Green Brook is a concrete continuous culvert carrying Plainfield Avenue over Green Brook in Union County, New Jersey. It was built in 1967, so it is 58 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 23,551 vehicles a day, roughly 4% of them trucks, projected to reach 28,737 by 2044. The structure is 26 ft (7.9 m) long and 50 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesPlainfield Avenue
CrossesGreen Brook
LocationAt Somerset County Line
RouteCounty Highway 641
CountyUnion County
StateNew Jersey
Coordinates40.65853, -74.41902
Functional classUrban Minor Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span13 ft (4 m)
Deck width50 ft (15.2 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,551 (2024)
Projected traffic28,737 by 2044
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$106,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Plainfield Avenue over Green Brook built?

It was built in 1967, making it 58 years old in 2025.

What condition is Plainfield Avenue over Green 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 March 2024.

How much traffic does Plainfield Avenue over Green Brook carry?

About 23,551 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Plainfield Avenue over Green Brook?

The structure is 26 ft (7.9 m) long with a longest span of 13 ft (4 m) and a deck 50 ft wide.

Who owns Plainfield Avenue over Green Brook?

It is owned by the County Highway Agency.