I like the beams of blue coming from the sun, below the horizon, in the top photo - and how that time of day, the water can look like metal. The water looks warm, with you'all tubing out there!
The whole history of Lewis and Clarke is something. It's neat that you were in an area they were in. It causes one to think about how that area was, when they were there.
I absolutely LOVE history. It's possible that their actual campsite is now under water due to the river changing course. The region was certainly more wooded back then. No gigantic power plant looming in the distance like there is now.
It's neat that you are a history buff. I bet you have some good historical reenactment events around you, for various times of history.
Mostly agricultural history around here. But the Mississippi and Missouri Rivers on each border hold a lot of early exploration history. There is also the Mormon Trail in southern Iowa that cut from Nauvoo, Illinois to Salt Lake City, UT.
Just the changes from prairie to agriculture would be so interesting. And connected with your big rivers, especially wetlands and the channels, and how people used those rivers. So much history!