Mississippi River flood waters diverted
10 May 2011 Last updated at 10:29 BST
Officials have diverted some of the Mississippi River's flow as the region prepares for river levels to reach near-record levels.
Crowds watched workers release a torrent of water into Lake Pontchartrain through floodway slats.
The southern US city of Memphis is coping with flood levels not seen since the 1930s, which have forced people from at least 1,300 homes.