Board your river cruise ship in Portland, Oregon and cruise to Clarkston, Idaho on a 9 day, 8 night journey. On your journey you will visit Ft. Clapstop, Mt St. Helens, Cross the “Bridge of the Gods” and admire Nulnomah Falls. You’ll end your cruise in Clarkston to fly home from Lewiston Idaho. American Cruise Lines. Call for Availability.