The familiar sounds of National Geographic Sea Lion smoothly pulling up to dock woke us this morning as we approached our mooring in Clarkston, WA. Our final full day has brought us to the limits of navigability on the Snake River, where it pours out of Hells' Canyon to the south and meets the Clearwater River rushing down from the Rocky Mountains to the east. Near here the Corps of Discovery had found friendly Nez Perce people, and a welcome respite after their perilous crossing of the mountains in the autumn of 1805. We have a chance today to explore some of this history, as well as gain a glimpse into the modern culture and economies of the valley.