The Santa Susana Pass was at the juncture of the Native American Tongva-Fernandeño, Chumash-Venturaño, and Tataviam-Fernandeño tribal lands and was first crossed by their trail route, and used for an estimated 8,000 years [REF].
The first Europeans to use the pass were members of the Spanish Portolà expedition (1769-1770), the first European land entry and exploration of the present-day state of California.