U.S. Route 399 - History

History

The origins to US 399 can be traced back to 1913. That year, the state decided to fund a survey party to determine a highway route between Legislative Route 4 (later became US 99 and today is known as SR 99) and Ventura. This highway was named the Bakersfield, Maricopa, and Ventura Road. At that time, several county roads which would become part of the route were already under construction. In the 1920s, the legislative definition would truncate the route as between Ventura and the Cuyama Valley. However, in 1934, the route would reemerge as a spur to US 99, called US 399.

By 1964, California’s highway system was very cumbersome. Several routes were cosigned with two or even three route numbers. As a result, all of the state’s highways were renumbered to simplify the system. During the renumbering, it was decided to decommission many of the US routes in California in favor of interstates and state routes. The parent route, US 99, was also decommissioned, which contributed to the removal of this route. US 399 became one of the US routes to be completely decommissioned. It became part of SR 33 (West Side Highway), SR 166 (Maricopa Highway), and all of SR 119 (Taft Highway).