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I-78 over Diamond Hill Rd (co 655)

Union County, New Jersey · rated Fair in the 2025 National Bridge Inventory

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

I-78 over Diamond Hill Rd (co 655) in Union County, New Jersey, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1986, making it 39 years old at the 2025 inventory.
It carries about 105,635 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 319 of the 409 inventoried bridges in Union County rated fair (78.0%); 16 (3.9%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 183 ft
Location	1.8 Mi E of I-78 Exit 43
NBI structure number	2010154
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Parkway N/S over Elizabeth River	1952	287,498	Good
Gsp over Br Rahway River & Mains	1947	278,487	Fair
Gsp over Rahway River	1948	247,670	Fair
Nj Turnpike over Central Railroad of Nj	1950	246,243	Fair
I-78 over Garden State Parkway	1976	236,895	Fair
Garden St Parkway over Michigan Avenue	1952	227,167	Fair