Great Falls Portage
Encyclopedia
Great Falls Portage is the site on the Missouri River that was an arduous portage site for the Lewis and Clark expedition
Lewis and Clark Expedition
The Lewis and Clark Expedition, or ″Corps of Discovery Expedition" was the first transcontinental expedition to the Pacific Coast by the United States. Commissioned by President Thomas Jefferson and led by two Virginia-born veterans of Indian wars in the Ohio Valley, Meriwether Lewis and William...

 in 1805. On the upriver trip, the 18 mile portage took 31 days.

It was declared a National Historic Landmark
National Historic Landmark
A National Historic Landmark is a building, site, structure, object, or district, that is officially recognized by the United States government for its historical significance...

 in 1966.

Two separate portions of their portage route are landmarked, and these portions include the lower campsite where boats were taken out, and the upper campsite where the boats were reassembled.

In May, 2008 The National Trust for Historic Preservation listed the site on their list of America's Most Endangered Places
America's Most Endangered Places
Each year since 1987, the National Trust for Historic Preservation has released a list of places they consider the most endangered in America. The number of sites included on the list has varied, with the most recent lists settling on 11...

.
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