New Orleans is left with no power, no drinking water, dwindling food supplies, widespread looting, fires -- and steadily rising waters from major levee breaches. Efforts to limit the flooding are unsuccessful and force authorities to try evacuating the thousands of people at city shelters.
Mississippi Gov. Haley Barbour says Katrina inflicted more damage to the state's beach towns than did Hurricane Camille, and its death toll is likely to be higher. In Mobile, Alabama, the storm pushed water from Mobile Bay into downtown, submerging large sections of the city.
The U.S. military starts to move ships and helicopters to the region at the request of the Federal Emergency Management Agency.
Katrina is downgraded to a tropical depression.