The Lewis and Clark Expedition reached this area April 27, 1806, on their return journey from the Pacific. The expedition spent three days at the village of Chief Yallept and his tribe of Walla Walla people (relatives of the Nez Perce), in the company of about a hundred Yakama people. Meriwether Lewis estimated the total of Native American people at around 550. There the expedition learned of an overland route to the Nez Perce homelands, which shortened their route by some eighty miles.