In 1806, the river was called "Elk River" by Native Americans and "Rochejhone" by French trappers, a name that became today's Yellowstone River. As Lewis and Clark traveled homeward, the captains took different routes to cover more territory, and Captain Clark, ten men, Sacagawea, and her infant son Pomp explored the Yellowstone River. The party crossed the Bridger Mountains and rode along the river's north side until they found trees large enough to make dugout canoes near present-day Park City, Montana. Clark's group passed through Sweet Grass County July 16-18, 1806, camping on the evening of July 16 at Little Timber Creek east of Big Timber. The next day they covered 33 miles along well-worn Indian and buffalo trails, passing this location, and camped just west of present-day Reed Point. Clark wrote on July 16, 1806, that the river and creek bottoms abounded in cottonwood trees, but none were large enough for canoes, the current of the Rochejhone was too rapid to rely on skin canoes, and he had no choice but to continue downstream until he could find a tree large enough to make a canoe.