Description: Postcard image of the "Crest of Boulder Dam and Arizona Highway" as written in white text near bottom right of postcard. The semi-circular roadway atop the dam has many automobiles traveling across it. Two walkways radiate from the highway (one in foreground, the other near center of photo). Mountains in background. Black text on back of postcard reads: "For Correspondence Post Card Address [in black line rectangle] Postage 1 [cent]". A decorative black line with JCB (?) at bottom, separates message and address.