the bridge deck of the mike o` callaghan-pat tillman memorial bridge over the colorado river at the hoover dam

bridge deck mike callaghanpat tillman memorial colorado river hoover dam border states nevada arizona america arch architecture atop boulder canyon concrete connecting construction crosses desert downstream electric electricity energy engineering environment famous generating generation generator high hydro hydroelectric hydropower industry just lake landmark landscape mead mountain ocallaghanpat outdoors plant power reservoir rock rocks scene sky structure technology that usa viewed water