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Nj Rt 31 over Lehigh Valley Main Line

Hunterdon County, New Jersey · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Nj Rt 31 over Lehigh Valley Main Line in Hunterdon County, New Jersey, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2003, making it 22 years old at the 2025 inventory.
It carries about 27,439 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 75 of the 373 inventoried bridges in Hunterdon County rated good (20.1%); 26 (7.0%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Continuous steel stringer or multi-beam girder
Length	about 164 ft
Location	1.95 Mi N. of Co Rt 523
NBI structure number	1012155
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the New Jersey department of transportation.

Bridge	Built	Vehicles/day	Condition
I-78 EB over US 22 WB	1968	661,439	Fair
Rte I-78 & Ramp R over Beaver Brook	1948	130,244	Fair
I-78 over Beaver Brook	1941	130,244	Poor
I-78 over Branch Rockaway Creek	1966	129,446	Fair
I-78 EB over Beaver Brook	1958	109,955	Fair
I-78 over Tunnel Road	1960	108,465	Fair