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The Yuma Territorial Prison is a former prison located in Yuma, Arizona, United States. Opened on July 1, 1876, and shut down on September 15, 1909. It is one of the Yuma Crossing and Associated Sites on the National Register of Historic Places in the Yuma Crossing National Heritage Area. The site is now operated as a historical museum by Arizona State Parks as Yuma Territorial Prison State Historic Park.