When Meriwether Lewis arrived at the Great Falls of the Missouri he was reassured that the Corps had chosen correctly at its junction with the Marias River. But when he found five waterfalls he realized the gigantic task facing his men. The 18-mile portage took a month to complete! Wheels were sliced from tree trunks and the boats were winched with ropes and muscle. The Lewis and Clark Interpretive Center told the story of the portage. It also included stories of the Indians that were encountered on the journey.