During his return trip to St. Louis, William Clark of the Lewis and Clark Expedition climbed the Pillar and carved his signature and the date in the sandstone. Clark wrote, “This rock I ascended and from it’s top had a most extensive view in every direction on the Northerly Side of the river high romantic Clifts approach & jut over the water for Some distance both above and below...I marked my name and the day of the month and year."
This historic carving on the sandstone butte that Clark called a “remarkable rock” has inspired generations of visitors for more than 100 years.
Pompeys Pillar in Montana was proclaimed a national monument in January 2001. Prior to its monument status, it was a designated national historic landmark in 1965. It is located along the Lewis and Clark National Historic Trail.
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