Located in Yuma (now La Paz) County, Arizona, near the Colorado River. Opened in 1942 as an assembly center under the Bureau of Indian Affairs, before being transferred to the WRA and redesignated as the Colorado River Relocation Center (Later Poston). At its peak, Poston held around 17,814 incarcerees, mainly coming from Kern County, Fresno, Monterey Bay Area, Sacramento County, southern California, and southern Arizona. Over 1,700 Nisei from Poston would serve in the armed forces. Poston would finally close on November 28, 1945.