Transmission tower and lines near Hoover Dam. Caption on top of postcard reads: "Boulder Dam power for Arizona! Towers like this will carry low-cost energy into Arizona when this state follows the example afforded by California and Nevada." Boulder Dam was officially re-named Hoover Dam in 1947.
Postcard showing the site in Black Canyon where Hoover Dam was originally meant to be built. The name evolved from "Black Canyon Dam" to "Boulder Dam" and was officially named Hoover Dam in the late 1940s. Note on front of post card: "Looking upstream Colorado river Black Canyon Dam Site"; Handwritten note and diagram on back of photo: "Hold this to light and you can get some idea of dimensions of dam."