For the final full day or our expedition, we are based between Clarkston and Lewiston at the Washington-Idaho junction of the Snake and Clearwater Rivers. Lewis and Clark passed this way on both their westward and return journeys, and in addition to naming and describing many places for the first time in the English language, ultimately lending their names to these twin cities on the Washington-Idaho border. We began early, boarding jet boats for a seven-hour journey deep into Hells Canyon on the Snake River.