Mare Island Historic District(Boundary Increase)

Mare Island Naval Shipyard in Vallejo, California, has been a U.S. Navy ship building and repair facility since 1854, and its historic district covers about 980 acres of the base. The district holds hundreds of buildings, structures, landscape areas and an archeological site. They include early shipyard workshops, huge twentieth-century shop buildings, an ammunition depot, a naval hospital, Marine barracks, a submarine base, a cemetery, parks, and housing ranging from officers' mansions to civilian cottages. The nomination presents this variety as the district's defining trait, reflecting a naval community comparable to a small municipality. It replaces earlier, smaller districts defined by a National Historic Landmark designation and a 1980s survey by adding World War II properties and many small ancillary buildings. The district is significant for military and industrial history, architecture and engineering, and historic archeology, with a period of significance from 1854 to 1945. Areas dominated by post-1945 construction were left out of the boundaries.