spherical panorama of hoover dam and mike o callaghan pat tillman memorial bridge

hoover dam memorial bridge spherical arch bypass infrastructure panorama architecture engineering river canyon rugged rocky turquoise water reflection structure clear sky power lines generation landmark energy concrete nevada arizona usa travel tourism geology environment irrigation reservoir colorado black hydroelectric electricity famous technology boulder desert industry construction las vegas attraction sightseeing border brown red city april 2024 mike callaghan pat tillman 2024: view o’callaghan–pat o’callaghanpat o’callaghan