 Under Washington Territory, the area was part of Idaho County from the time of settlement until the territory south of the Payette River became part of Boise County at its creation in 1863.Picket's Corral, northeast of Emmett was the base of operations for a gang of horse thieves and "bogus dust peddlers" between 1862 and 1864.The Payette Vigilance Committee eliminated the gang, bringing safety for citizens of the area.