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State Route 99 (SR 99) is a north–south state highway in the U.S. state of California, stretching almost the entire length of the Central Valley. From its southern end at Interstate 5 (I-5) near Wheeler Ridge to its northern end at SR 36 near Red Bluff, SR 99 goes through the densely populated eastern parts of the 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 Mexican border to Blaine, Washington, on the Canadian border.
Learn how US 99 ran 917 miles through the heart of California from Oregon to Mexico, and see the current and former state highways it followed. Find out about the spur routes of US 99 and their current designations.
Famous for its bountiful produce, quality wine, and country music, the Central Valley is California’s heartland. It’s also a place of endless discoveries, so head out on a 250-mile road trip along California Highway 99 between Bakersfield and Lodi.
Learn about the origins and evolution of California 99, a major north-south corridor through the Central Valley that follows the original alignment of U.S. 99. Find detailed guides for each county along the route, from Kern to Butte.
Section 1304 adds Route 99 to the list of high priority corridors (#54): The California Farm-to-Market Corridor, California State Route 99 from south of Bakersfield to Sacramento, California. Hosking Avenue Interchange (~ KER 18.58)
Learn about the history and significance of Route 99, the first inland route between Mexico and Canada, and the predecessor of Interstate 5. Discover where you can still see the road signs of this historic highway in California and other states.
