US Bridges

Plainsboro Rd. over Cedar Brook

Fair

Middlesex County, New Jersey · 0.7 MI E Ofgeorge Davidso · Structure no. 124B083

Built
1980
45 years old
Condition
Fair
inspected May 2023
Type
Slab
Prestressed Concrete
Length
43 ft
1 main span
Daily traffic
12,353
2023 count
Owner
County
County Highway Agency

About this bridge

Plainsboro Rd. over Cedar Brook is a prestressed concrete slab carrying Plainsboro Rd. over Cedar Brook in Middlesex County, New Jersey. It was built in 1980, so it is 45 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 12,353 vehicles a day, roughly 4% of them trucks, projected to reach 15,073 by 2043. The structure is 43 ft (13.1 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesPlainsboro Rd.
CrossesCedar Brook
Location0.7 MI E Ofgeorge Davidso
RouteCity Street 0
CountyMiddlesex County
StateNew Jersey
Coordinates40.3241, -74.55278
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span39 ft (11.9 m)
Deck width40 ft (12.3 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,353 (2023)
Projected traffic15,073 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Plainsboro Rd. over Cedar Brook built?

It was built in 1980, making it 45 years old in 2025.

What condition is Plainsboro Rd. over Cedar 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 May 2023.

How much traffic does Plainsboro Rd. over Cedar Brook carry?

About 12,353 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Plainsboro Rd. over Cedar Brook?

The structure is 43 ft (13.1 m) long with a longest span of 39 ft (11.9 m) and a deck 40 ft wide.

Who owns Plainsboro Rd. over Cedar Brook?

It is owned by the County Highway Agency.