River Rock Form Letter On February 28th at 8:30am, the supervisors will be voting on an issue greatly affecting the future of Alexander Valley. Subsequently, the casino expanded to 1,150 slot machines, 18 gaming table and a buffet restaurant.
15, 2002 with two tent structures and sixty slot machines. BACKGROUND – River Rock Casino, situated in the heart of Alexander Valley, is owned and operated by the Dry Creek Rancheria Band of Pomo Indians in Sonoma County.
