Interstate 405 (California) - History

History

I-405 was approved as a chargeable interstate in 1955. Construction began in 1957 with the first section, mostly north of LAX Airport being completed in 1961 (signed as SR 7) followed by sections west of Interstate 605 within the following few years. The final section covering most of Orange County opened in 1969. Construction required the already existing Mulholland Highway to be re-routed 1.1 miles to the south along a new 579-foot-long bridge, the Mulholland Drive Bridge, to span Interstate 405.

The freeway from present-day I-10 to I-5 near San Fernando was once known as the "Sepulveda Freeway" as it was named for Sepulveda Boulevard.

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