People walk in the storm surge from Isaac, on Lakeshore Drive along Lake Pontchartrain, as the storm approaches landfall, in New Orleans, Tuesday, Aug. 28, 2012. The storm was arriving at the seventh anniversary of Hurricane Katrina, which devastated Louisiana and Mississippi when it struck on Aug. 29, 2005. (AP Photo/Gerald Herbert)

Associated Press
People walk in the storm surge from Isaac, on Lakeshore Drive along Lake Pontchartrain, as the storm approaches landfall, in New Orleans, Tuesday, Aug. 28, 2012. The storm was arriving at the seventh anniversary of Hurricane Katrina, which devastated Louisiana and Mississippi when it struck on Aug. 29, 2005. (AP Photo/Gerald Herbert)
People walk in the storm surge from Isaac, on Lakeshore Drive along Lake Pontchartrain, as the storm approaches landfall, in New Orleans, Tuesday, Aug. 28, 2012. The storm was arriving at the seventh anniversary of Hurricane Katrina, which devastated Louisiana and Mississippi when it struck on Aug. 29, 2005. (AP Photo/Gerald Herbert)
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