Established in February 27, 1911 with its county seat at Orofino. Named for the Clearwater River whose name was translated from the Nez Perce term Koos-Koos-Kai-Kai, describing clear water. In September, 1805, Lewis and Clark followed an old Indian trail between the north and middle forks of the Clearwater River and met the Nez Perce near the present site of Weippe. Gold was first discovered by E. D. Perce in 1860 and Pierce City, the oldest mining town in Idaho came into existence.