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Chimney Rock CR525 over Middle Brook

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

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

Chimney Rock CR525 over Middle Brook in Somerset 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 11,646 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 130 of the 397 inventoried bridges in Somerset County rated good (32.7%); 34 (8.6%) 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	Steel stringer or multi-beam girder
Length	about 46 ft
Location	1.3 m N of US 22
NBI structure number	18G0812
Condition class	Good

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