Clay and his good friend Russ Eagle discuss the rivers Lewis and Clark traveled from Pittsburgh to the Pacific Ocean, including the Ohio, the Mississippi, the Missouri, the Clearwater, the Snake, and the Columbia. The paradox of Clay’s 2025 Airstream journey along the Lewis and Clark Trail is that they floated America’s rivers, and Clay has been driving along the roads closest to those rivers. To overcome this, he has contrived ways to get on the rivers of the expedition. In North Dakota, he floated for three days in a pontoon from Fort Rice to Bismarck with two young comrades. Just north of Yellowstone National Park, he and his friends, including his daughter and her fiancé, took a day-long raft trip on the Upper Yellowstone, where it remains a whitewater stream. As they recorded this podcast, Clay and Russ, plus 20 others, were about to float the famous White Cliffs section of the Missouri, east of Fort Benton, Montana. And Clay plans to get passage on an excursion boat near the mouth of the great Columbia River. Why are rivers so important to Clay? What is it about the source of mighty rivers that so engages his historical imagination? This podcast was recorded on July 20, 2025.