Red Rock

The Red Rock River rises near the Continental Divide and flows northwest through the valleys of the northern Rockies. It joins Horse Prairie Creek to form the Beaverhead, one of the upper waters of the Missouri. In August 1805, Meriwether Lewis followed the river country towards the divide in search of the Shoshone. After crossing the mountains and meeting them, he returned with Shoshone people to the confluence, where they met William Clark and the rest of the expedition.