US Bridges

Wilhousky ST)CR623 over Millstone River

Good

Somerset County, New Jersey · 0.1 MI East CR 533 · Structure no. 18G0605

Built
1995
30 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
226 ft
3 main spans
Daily traffic
13,307
2023 count
Owner
County
County Highway Agency

About this bridge

Wilhousky ST)CR623 over Millstone River is a steel continuous stringer/multi-beam or girder carrying Wilhousky ST)CR623 over Millstone River in Somerset 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 13,307 vehicles a day, roughly 3% of them trucks, projected to reach 16,237 by 2043. The structure is 226 ft (68.9 m) long and 48 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesWilhousky ST)CR623
CrossesMillstone River
Location0.1 MI East CR 533
RouteCounty Highway 623
Coordinates40.53015, -74.58857
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating74 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length226 ft (68.9 m)
Longest span74 ft (22.6 m)
Deck width48 ft (14.6 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,307 (2023)
Projected traffic16,237 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 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 Wilhousky ST)CR623 over Millstone River built?

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

What condition is Wilhousky ST)CR623 over Millstone River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Wilhousky ST)CR623 over Millstone River carry?

About 13,307 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Wilhousky ST)CR623 over Millstone River?

The structure is 226 ft (68.9 m) long with a longest span of 74 ft (22.6 m) and a deck 48 ft wide.

Who owns Wilhousky ST)CR623 over Millstone River?

It is owned by the County Highway Agency.