Description: Postcard image of the "Terrazo Floor In Boulder Dam Powerhouse" as written in white text in top right corner. The floor has a unique patterned circle near center with a man leaning to the outside of the circle on center right of photo. Metal rail extends from left edge to near center of photo. Metal vertical ladder on other side of rail. Cement wall in background. Black text on back of postcard reads: "Message Post Card Address [in black line rectangle] Postage 1 [cent]".
Date: 1925 - 1935