Description: Postcard image of an "Aerial View Of Boulder Dam" showing the semi-circular dam with cars on highway at top. Two cylinder shaped extensions radiating from either side of main portion of dam. Smaller roadways cross-cross in top right. Cement parking area on left. The canyon extends vertically across the center of the postcard. Black text on back of postcard reads: "Message Post Card Address [in black line rectangle] Postage 1 [cent]".