The Sonoma County Board of Supervisors has approved an agreement paving the way for a tribal casino-resort on the site of the current River Rock Casino near Geyserville.įollowing a meeting on Tuesday, the board voted 4-1 to approve the agreement, reports The Press Democrat, which outlines a project on Dry Creek Rancheria’s Alexander Valley land that would feature a nearly 300-room hotel, a 60,000-square-foot casino with up to 1,500 slot machines - about 300 more than in the existing gaming hall - a wedding chapel and spa, among other amenities.