About West Valley Detention Center
West Valley Detention Center is at 9500 Etiwanda Ave., Rancho Cucamonga, CA 91739. It opened in 1991, and the Sheriff cites a capacity of 3,347 and 50,000–60,000 bookings and releases a year. Most west-end arrests — Ontario, Upland, Chino, Montclair, Fontana and Rancho Cucamonga — end up here if the person isn't released.
Because of that volume, the release desk can be busy, and timing varies. Our separate article on how long it takes to get out of West Valley covers timing; this page is the step-by-step bail guide.