US Bridges

Southfield Road over Millstone River

Fair

Mercer County, New Jersey · 1 MI N of Hgtstn RD CR571 · Structure no. 1107606

Built
1995
30 years old
Condition
Fair
inspected February 2023
Type
Truss - Thru
Steel
Length
82 ft
1 main span
Daily traffic
1,067
2023 count
Owner
County
County Highway Agency

About this bridge

Southfield Road over Millstone River is a steel truss - thru carrying Southfield Road over Millstone River in Mercer County, New Jersey. It was built in 1995, so it is 30 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 1,067 vehicles a day, roughly 1% of them trucks, projected to reach 1,276 by 2043. The structure is 82 ft (25 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSouthfield Road
CrossesMillstone River
Location1 MI N of Hgtstn RD CR571
RouteCity Street 0
CountyMercer County
StateNew Jersey
Coordinates40.30371, -74.57542
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating33 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length82 ft (25 m)
Longest span66 ft (20.1 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,067 (2023)
Projected traffic1,276 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 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 Southfield Road over Millstone River built?

It was built in 1995, making it 30 years old in 2025.

What condition is Southfield 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 February 2023.

How much traffic does Southfield Road over Millstone River carry?

About 1,067 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Southfield Road over Millstone River?

The structure is 82 ft (25 m) long with a longest span of 66 ft (20.1 m) and a deck 33 ft wide.

Who owns Southfield Road over Millstone River?

It is owned by the County Highway Agency.