Rockin the Rivers is the brainchild of a few old rock n rollers who wanted to share their love of classic rock with friends and family. Since 1999, their vision has evolved into a three-day rock festival located near Three Forks, Montana, in the Jefferson River Canyon. Participants: Hoobastank Stone Temple Pilots Blacktop Mojo Cody Parks and The Dirty South Hinder Hoobastank Liliac Simon Says Smash Mouth Smile Empty Soul Stone Temple Pilots The Cadillac Three The Wallflowers Tim Montana More Info below.