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Bolker Dr over Oxnard West Drain

Ventura County, California · rated Good in the 2025 National Bridge Inventory

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

Bolker Dr over Oxnard West Drain in Ventura County, California, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 1971, making it 54 years old at the 2025 inventory.
It carries about 1,430 vehicles a day (traffic count year 2019).
Its listed owner is a city or municipal highway agency.
It is one of 288 of the 501 inventoried bridges in Ventura County rated good (57.5%); 12 (2.4%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	7	Good condition

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

Bridge	Built	Vehicles/day	Condition
U.S. Highway 101 over Hampshire Rd	1966	193,000	Fair
U.S. Highway 101 over Conejo School Rd	1966	193,000	Fair
U.S. Highway 101 over Rancho Rd	1970	193,000	Good
U.S. Highway 101 over S101-n23 Connector Ramp	1970	193,000	Good
U.S. Highway 101 over Moorpark Rd	1962	192,000	Fair
U.S. Highway 101 over Hillside	1982	192,000	Good