aerial view, new highway and bridges under construction to bypass Hoover Dam in part for national security reasons , October 26, 2009
Title:Hoover Dam
Author:engineering firm: United States Bureau of Reclamation (American, 1902-), contractor: Six Companies (American, 20th century)Date:2010-04-05
aerial view, dam to Lake Mead with new bypass bridge under construction, October 25, 2009
Title:Hoover Dam
Author:United States Bureau of Reclamation; Six CompaniesDate:1931-1936