​Oregon State Penitentiary (OSP) is the oldest prison in Oregon and the only maximum-security institution currently operated by the Oregon Department of Corrections. The Penitentiary has been sited at three separate locations. Originally, the Penitentiary was called the Oregon Territory Jail and was in Oregon City, then the capitol of Oregon. The Territory Jail was built in April 1842. The Jail was later destroyed by fire on August 18, 1846. Please call to confirm visiting hours.