National Geographic : 1941 Jun
Photograph byCorps ofEngineers, U.S.Army Army Engineers Make a Giant Asphalt Mattress Which Will Keep Old Man River from Caving inHis Banks Hot asphalt is laid on the barge floor, which has been lubricated to prevent sticking. After one section of the huge mat iscompleted, and sprayed with water, it is lowered over the metal cylinder into the river. More sections are added, until gradually they cover the bank and part oftheriver bottom, near Westwego, Louisiana. Warm and flexible, they fit into the contours of the bank. Some mats are 100 feet wide and 300 feet long (page 740).