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State Route 23 over Olsen Road

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

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

State Route 23 over Olsen Road 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 deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1970 and reconstructed in 2008, making it 55 years old at the 2025 inventory.
It carries about 89,000 vehicles a day (traffic count year 2015).
Its listed owner is the state 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


Structure	Continuous prestressed concrete multiple box beam
Length	about 252 ft
Location	07-ven-023-r8.19-thok
NBI structure number	52 0312L
Condition class	Good

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