Great Falls PortageGreat Falls Portage

The Lewis and Clark Expedition undertook an 18-mile, 31-day portage at Great Falls, one of the most difficult ordeals of their westward trip. The Great Falls Portage NHL is within Giant Springs State Park.[10] Photo: JERRYE AND ROY KLOTZ MD, CC BY-SA 3.0, via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:GREAT_FALLS_PORTAGE,_CASCADE_COUNTY,_MONTANA.jpg)