The Corps of Discovery had followed the…
August 1805 CE
The pass had gained importance in the eighteenth century, when the Lemhi Shoshone acquired horses and used the route to travel between the two main parts of their homeland.
From the time of the Louisiana Purchase in 1803 until the Oregon Treaty in 1846 the pass will mark the western border of the United States.
Lewis had found a "large and plain Indian road" over the pass.
This was the first time that white men had seen present-day Idaho:
We proceeded to the top of the dividing ridge from which I discovered immense ranges of high mountains still to the West of us with their tops partially covered in snow.
The next day Lewis had met Cameahwait and his band of Shoshone, and returned with them across the pass to meet Clark.
On August 26, 1805, the entire expedition crosses the pass.
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