US Bridges

Alexander Road over Stony Brook

Good

Mercer County, New Jersey · 0.6 MI North of US 1 · Structure no. 1100065

Built
2019
6 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
93 ft
1 main span
Daily traffic
16,224
2024 count
Owner
County
County Highway Agency

About this bridge

Alexander Road over Stony Brook is a steel stringer/multi-beam or girder carrying Alexander Road over Stony Brook in Mercer County, New Jersey. It was built in 2019, so it is 6 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 16,224 vehicles a day, roughly 4% of them trucks, projected to reach 19,405 by 2044. The structure is 93 ft (28.3 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesAlexander Road
CrossesStony Brook
Location0.6 MI North of US 1
RouteCity Street 0
CountyMercer County
StateNew Jersey
Coordinates40.33233, -74.65334
Functional classUrban Minor Arterial

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 inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67.5 US tons
Inventory rating52.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length93 ft (28.3 m)
Longest span90 ft (27.4 m)
Deck width45 ft (13.8 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,224 (2024)
Projected traffic19,405 by 2044
Trucks4%
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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$5.4 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Alexander Road over Stony Brook built?

It was built in 2019, making it 6 years old in 2025.

What condition is Alexander Road over Stony Brook 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 February 2024.

How much traffic does Alexander Road over Stony Brook carry?

About 16,224 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Alexander Road over Stony Brook?

The structure is 93 ft (28.3 m) long with a longest span of 90 ft (27.4 m) and a deck 45 ft wide.

Who owns Alexander Road over Stony Brook?

It is owned by the County Highway Agency.