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
Occupation of Alcatraz at 47 cents per acre, this amounted to $9.40 for the entire rocky island, or $5.64 for the twelve usable acres. Cottier also stated that the federal government would be allowed to maintain use of the Coast Guard lighthouse located on the island. The protesters left under threat that they would be charged with felony. This incident resulted in increased media attention for indigenous peoples' protests across the Bay Area. The United Council of the Bay Area Indian community initially considered writing a proposal and filing an application for the use of Alcatraz by Sioux people under the conditions of