Great Falls, Montana: June 16 - July 14, 1805

As the expedition approached the source of the Missouri River, they came up against a daunting collection of rapids and waterfalls. Since the waterway was impassable, a long portage lay ahead. The men were forced to carry the boats and all their remaining equipment and supplies roughly 18 miles overland, skirting five waterfalls along the way. The portage took nearly a month.

Landsat 7 and DEM
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