Alcatraz Island 1906 San Francisco earthquake, civilian prisoners were transferred to Alcatraz for safe confinement. On March 21, 1907, Alcatraz was officially designated as the Western U.S. Military Prison, later Pacific Branch, U.S. Disciplinary Barracks, 1915. In 1909 construction began on the huge concrete main cell block, designed by Major Reuben Turner, which remains the island's dominant feature. It was completed in 1912. To accommodate the new cell block, the Citadel, a three-story barracks, was demolished down to the first floor, which was actually below ground level. The building had been constructed in an excavated pit (creating a dry "moat") to enhance
Alcatraz Library Alcatraz Library Alcatraz Library was a library for inmates at Alcatraz Federal Penitentiary. It was located at the end of D-Block. On entering Alcatraz, every inmate received a library card and a catalog of books found in the library. An inmates ordered a book by putting a slip with their card in a box at the entrance to the dining hall before breakfast, and a librarian took the order to and from their cell. The library, which used a closed-stack paging system, had a collection of 10,000 to 15,000 books, mainly left over from Alcatraz's army days. Inmates were permitted