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Zion-wertsville Rd over Rock Brook

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

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

Zion-wertsville Rd over Rock Brook in Somerset 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 substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1825 and reconstructed in 2023, making it 200 years old at the 2025 inventory.
It carries about 903 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 233 of the 397 inventoried bridges in Somerset County rated fair (58.7%); 34 (8.6%) 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

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

Bridge	Built	Vehicles/day	Condition
Route I-287 over Canal Rd D&r Raritan&rr	1960	159,760	Fair
I-287 over NJT (Raritan Valley)	1960	148,249	Fair
I-287 over Main St (CR 533)	1960	138,097	Fair
I-287 over Sky Brook	1959	122,240	Fair
Route I-287 S.B. over Elizabeth Ave (CR 621)	1961	120,175	Fair
I-78 over Corys Brook	1965	105,645	Fair