Tower Rock National Register of Historic Places Listing

On July 16, 1805, Meriwether Lewis stared up at a massive, 400-foot volcanic monolith rising above the Missouri River. He called it Tower Rock. This giant slab of rock marked a crucial ecological boundary. For the Corps of Discovery, this hunk of basalt meant they were officially leaving the flat plains and entering the rugged Rocky Mountains. Native tribes got there first, though. For centuries, Blackfeet and Salish hunters used the stone sentinel to navigate the Old North Trail. A prehistoric highway. Tower Rock told them they had finally reached the edge of the buffalo country.

Lewis actually climbed the formation. He wanted to get a better look at the winding river ahead. In his journal, he scribbled down descriptions of the "tremendous looking precipice." He wasn't exaggerating. The sheer cliffs still look intimidating today, looming over Interstate 15 just south of Cascade. The state created a state park around the site in 2004, but its spot on the National Register of Historic Places came a couple of years earlier, in 2002. It isn't just about Lewis and Clark. Instead, it preserves a physical junction of geography and human movement. You can still hike up to the rocky saddle. The wind is brutal. It rattles the sagebrush and carries the dry scent of pine.