The main portion of the road, from Cahuenga Pass in Hollywood westward past Sepulveda Pass, was originally called Mulholland Highway and was opened in 1924.[3] It was built by a consortium of developers investing in the Hollywood Hills.[4] DeWitt Reaburn, the construction engineer responsible for the project, said while it was being built, "The Mulholland Highway is destined to be one of the heaviest traveled and one of the best known scenic roads in the United States."
The street has experienced multiple closures throughout the years due to mudslides and storm damage, with the latest one being in 2024. [5]
The road winds along the top of the mountains until a few miles west of the San Diego/Interstate 405 Freeway. Just west of the intersection with Encino Hills Drive, it becomes an unpaved road not open to motor vehicles. This part is known by many as "Dirt Mulholland". This portion connects with other unpaved roads and bike trails and allows access to a decommissioned Project Nike command post that is now a Cold War memorial park. (This portion of Mulholland Drive was open to through traffic as late as the 1990s before being permanently closed to motor vehicles so that they would no longer interfere with the natural beauty and wilderness of the area.)
The road opens again east of Topanga Canyon Boulevard (State Route 27) at Santa Maria Road but remains dirt until it reaches Saltillo Street. Shortly thereafter, the thoroughfare splits into Mulholland Drive and Mulholland Highway. Mulholland Drive terminates at U.S. Highway 101 (the Ventura Freeway), where it becomes Valley Circle Boulevard. Mulholland Highway continues to the southwest until it terminates at State Route 1 (PCH) in Leo Carrillo State Park[1] at the Pacific Ocean coast and the border of Los Angeles and Ventura counties.
^Matthew W. Roth (July 1999). "Mulholland Highway and the Engineering Culture of Los Angeles in the 1920s". Technology and Culture. 40: 545–575. JSTOR25147359.