US Bridges

Plainsboro Road over Devils Brook

Poor

Middlesex County, New Jersey · 1.0 MI East of US Rt 1 · Structure no. 124B087

Built
1979
46 years old
Condition
Poor
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
56 ft
1 main span
Daily traffic
5,615
2023 count
Owner
County
County Highway Agency

About this bridge

Plainsboro Road over Devils Brook is a prestressed concrete box beam or girders - multiple carrying Plainsboro Road over Devils Brook in Middlesex County, New Jersey. It was built in 1979, so it is 46 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 5,615 vehicles a day, roughly 3% of them trucks, projected to reach 6,852 by 2043. The structure is 56 ft (17.1 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesPlainsboro Road
CrossesDevils Brook
Location1.0 MI East of US Rt 1
RouteCity Street 0
Coordinates40.3336, -74.61201
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span52 ft (15.8 m)
Deck width40 ft (12.3 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,615 (2023)
Projected traffic6,852 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Plainsboro Road over Devils Brook built?

It was built in 1979, making it 46 years old in 2025.

What condition is Plainsboro Road over Devils Brook in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.

How much traffic does Plainsboro Road over Devils Brook carry?

About 5,615 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Plainsboro Road over Devils Brook?

The structure is 56 ft (17.1 m) long with a longest span of 52 ft (15.8 m) and a deck 40 ft wide.

Who owns Plainsboro Road over Devils Brook?

It is owned by the County Highway Agency.