We chose this cruise because it didn't go onto the open ocean, and we wanted the river experience. Overall impression: Nice, but you have to be a real Lewis & Clark fan to get the most out out of this cruise, and you need to be able to handle the heat during summer.
We cruised from Portland, OR to Clarkton, then back, in July.
I should have done my geographical homework before we left. I thought "Columbia Gorge!! Oregon rainforest! Nice and cool!" I couldn't have been more wrong. The Columbia Gorge part was about a day. The remaining 5 days were absolute desert with not much to see. Hot hot hot. I could have dealt with that, IF:
Excellent room, fabulous bed, with plenty of storage. Showers were small, but plenty of hot water. Downside was that people stood at the railing outside and often stared into our room. The company should hang some sheer curtains under the blackout ones for privacy.