11 Most Endangered Historic Places

Great Falls Portage

Year Listed: 2008
Location: Great Falls, Montana
Threat: Development

Significance

The Great Falls Portage, one of the best preserved and most accessible landscapes along the Lewis and Clark Trail, is a windblown, undeveloped rural area surrounded by mountains and a panorama of blue Montana skies.  This National Historic Landmark marks the location where, in 1805, the historic expedition faced its most challenging obstacle —the 18-mile, 31-day portage around the Great Falls of the Missouri River.