A woman braves heavy rain and strong winds as she rides a bike, Wednesday, Aug. 29, 2012, in Gulfport, Miss. Isaac pelted parts of south Mississippi with heavy rains, flooding some homes in low-lying areas and turning parts of beachside U.S. Highway 90 into a river near Biloxi casinos. (AP Photo/John Bazemore)
Gallery: More photos from Hurricane Isaac
Aug. 30, 2012 @ 11:37 AM
Hurricane Isaac poured unrelenting rain Thursday, flooding areas north and south of New Orleans even as the city's fortified defenses held and forcing officials to launch speedy evacuation and rescue efforts in the face of fast-rising waters.