Many of the film 's whitewater scenes were filmed on the Kootenai River in Montana ; others were filmed on the Ruby Horsethief section of the Colorado River , the Rogue River in Southern Oregon , and the Middle Fork of the Flathead River .
Many of the film 's whitewater scenes were filmed on the Kootenai River in Montana . 
 Additional ones were filmed on the Ruby Horsethief section of the Colorado River , the Rogue River in Southern Oregon , and the Middle Fork of the Flathead River .