U.S. Route 99W (northern California)

U.S. Route 99
Pacific Highway Golden State Highway
Route information
Maintained by Caltrans
Existed:	1926 – 1972
Major junctions
South end:	Fed. 5 at U.S.–Mexico border in Calexico, CA
	US 80 in El Centro, CA US 60 / US 70 in Los Angeles, CA US 101 in Los Angeles, CA US 66 in Los Angeles, CA US 50 from Sacramento to French Camp, CA US 40 from Davis, CA to Roseville, CA
North end:	US 99 in Oregon
Highway system
United States Numbered Highway System List Special Divided Replaced State highways in California Interstate U.S. State Pre-1964 History Unconstructed Deleted Freeway Scenic ← SR 98 SR 99 →

U.S. Route 99W
Location:	Central Valley

U.S. Route 99E
Location:	Central Valley

U.S. Route 99 (US 99) was the main north–south United States Numbered Highway on the West Coast of the United States until 1964, running from Calexico, California, on the US–Mexico border to Blaine, Washington, on the U.S.-Canada border. Known also as the "Golden State Highway" and "The Main Street of California", US 99 was an important route in California throughout much of the 1930s as a route for Dust Bowl immigrant farm workers to traverse the state. It was assigned in 1926 and existed until it was replaced for the most part by Interstate 5. A large section in the Central Valley is now State Route 99.

The highway started at the border with Baja California in Calexico, California. It then continued north along the western shore of the Salton Sea. The stretch is now known as State Route 86. Highway 99 continued along present-day State Route 111 through Coachella to its intersection at Dillon Road with another major US route signed as both US 60 and US 70.

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