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Lafourche Parish Sheriff�s Office vehicles drive pass downed power lines Wednesday near the Valentine Bridge Wednesday, Aug. 29, 2012, in Houma, La. (AP Photo/The Houma Daily Courier, Abby Tabor)

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.