US | Hurricane Isaac Mississippi Dam About to Fail Residents near Tangipahoa River given 90 minutes to evacuate By Kate Seamons Posted Aug 30, 2012 11:07 AM CDT Copied A motorist navigates through a flooded street, Wednesday, Aug. 29, 2012, in Gulfport, Miss. (AP Photo/John Bazemore) Isaac has not yet dealt his final blow: The Times-Picayune reports that Mississippi's Percy Quin Dam is about to fail as a result of flooding from the hurricane. A mandatory evacuation order was issued for communities along the Tangipahoa River; WWLTV reports that as many as 60,000 will need to exit. The Tangipahoa Parish president says water could reach the area by 11:40am local time. The National Guard is monitoring the dam via helicopter. Read These Next New Fox star, 23, misses first day after car troubles. Iran's supreme leader makes first public comments since ceasefire. Man accused of killing his daughters might be dead. Her blood isn't compatible with anyone else's. Report an error