US Bridges

Probasco Road over Millstone River

Fair

Middlesex County, New Jersey · 0.7 Mile North of RTE 33 · Structure no. 125B164

Built
2007
18 years old
Condition
Fair
inspected April 2023
Type
Slab
Prestressed Concrete
Length
39 ft
1 main span
Daily traffic
1,998
2023 count
Owner
County
County Highway Agency

About this bridge

Probasco Road over Millstone River is a prestressed concrete slab carrying Probasco Road over Millstone River in Middlesex County, New Jersey. It was built in 2007, so it is 18 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 1,998 vehicles a day, roughly 3% of them trucks, projected to reach 2,425 by 2043. The structure is 39 ft (11.9 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesProbasco Road
CrossesMillstone River
Location0.7 Mile North of RTE 33
RouteCity Street 0
CountyMiddlesex County
StateNew Jersey
Coordinates40.27755, -74.49083
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99 US tons
Inventory rating66 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length39 ft (11.9 m)
Longest span32 ft (9.8 m)
Deck width40 ft (12.3 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,998 (2023)
Projected traffic2,425 by 2043
Trucks3%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Probasco Road over Millstone River built?

It was built in 2007, making it 18 years old in 2025.

What condition is Probasco Road over Millstone River 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 April 2023.

How much traffic does Probasco Road over Millstone River carry?

About 1,998 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Probasco Road over Millstone River?

The structure is 39 ft (11.9 m) long with a longest span of 32 ft (9.8 m) and a deck 40 ft wide.

Who owns Probasco Road over Millstone River?

It is owned by the County Highway Agency.