What is the smallest size boat and HP outboard a person could comfortably get by with on the Missouri River as it flows through most of NE? I am not looking for doing anything but getting up and down the river for fishing or maybe hunting in the future. Also looking to get by with the "comfortable" minimum (if such thing exists

) as I currently don't have the budget, space or vehicle for anything too big (fish and ski etc.). Most of the time it would probably be just me and one other person with very little gear. If I would be safer fishing from the bank, that is OK too; not sure how strong the Mighty MO is through NE, I have only fished it here in MT.
Thanks in advance.