Chuck Cropp, center, his son Piers, left, and wife Liz, right, wade through floodwaters from Hurricane Isaac Wednesday, Aug. 29, 2012, in New Orleans. As Isaac made landfall, it was expected to dump as much as 20 inches of rain in several parts of Louisiana. (AP Photo/David J. Phillip)
A sherriff's vehicle sits in flood waters caused by Isaac, Thursday, Aug. 30, 2012, north of LaPlace, La, off Lake Pontchartrain. Isaac's maximum sustained winds had decreased to 45 mph and the National Hurricane Center said it was expected to become a tropical depression by Thursday night. The storm's center was on track to cross Arkansas on Friday and southern Missouri on Friday night, spreading rain as it goes. (AP Photo/Eric Gay)
A Waveland, Miss., resident wades through storm waters left from Isaac's unceasing rainstorms to seek shelter, Thursday, Aug. 30, 2012. Signs of life returned to the Mississippi Gulf Coast on Thursday as curfews were lifted and some businesses and roads reopened, but many residents still couldn't make it home because of flooding in low lying areas and along rivers. (AP Photo/Rogelio V. Solis)
A steady armada of utility service trucks drive through Waveland, Miss., to assist residents left without power from Hurricane Isaac, Thursday, Aug. 30, 2012. Signs of life returned to the Mississippi Gulf Coast on Thursday as curfews were lifted and some businesses and roads reopened, but many residents still couldn't make it home because of flooding in low lying areas and along rivers. (AP Photo/Rogelio V. Solis)
Waveland, Miss., residents wade through storm waters left from Isaac's unceasing rainstorms to seek shelter, Thursday, Aug. 30, 2012. Signs of life returned to the Mississippi Gulf Coast on Thursday as curfews were lifted and some businesses and roads reopened, but many residents still couldn't make it home because of flooding in low lying areas and along rivers. (AP Photo/Rogelio V. Solis)
Residents of the Riverbend Nursing Center wait to be evacuated to higher and safer ground as Hurricane Isaac makes landfall, Wednesday, Aug. 29, 2012, in Jesuit Bend, La. Plaquemines Parish ordered a mandatory evacuation for the west bank of the Mississippi below Belle Chasse because of worries about a storm surge. The order affected about 3,000 people, including residents of the nursing home. (AP Photo/Eric Gay)
Residents of the Cambridge Neighborhood in LaPlace Louisiana Wednesday Aug. 29, 2012 evacuate their neighborhood. The state sent scores of buses and dozens of high-water vehicles to help evacuate about 3,000 people from St. John the Baptist Parish after Tropical Storm Isaac pushed water from lakes Pontchartrain and Maurepas into parts of LaPlace. (AP Photo/Arthur D. Lauck, The Advocate)
Danessa Lee, left, comforts her granddaughter Ashanti Lee, 12, after their family was rescued in Pearlington, Miss., by law enforcement officers and first responders using boats, Wednesday, Aug. 29, 2012, during the nonstop rain from Isaac. A number of residents of the small community were trapped by the rising waters and had be rescued or waited until the low tide when waters receded so they could walk out. (AP Photo/Rogelio V. Solis)
A utility pole smolders after falling on power lines Wednesday Aug. 29, 2012, in Houma, La. Tropical Storm Isaac has dumped almost a foot of rain in parts of Louisiana. (AP Photo/The Houma Daily Courier, Chris Heller )
An egret perches above rising waters Wednesday, Aug. 29, 2012 in Bayou Cane, La. Tropical Storm Isaac has dumped almost a foot of rain in parts of Louisiana. (AP Photo/The Houma Daily Courier, Chris Heller )
Residents of the Cambridge Neighborhood of LaPlace Louisiana flee rising flood waters associated with Hurricane Isaac Wednesday Aug. 29, 2012. The state sent scores of buses and dozens of high-water vehicles to help evacuate about 3,000 people from St. John the Baptist Parish after Tropical Storm Isaac pushed water from lakes Pontchartrain and Maurepas into parts of LaPlace. (AP Photo/Arthur D. Lauck, The Advocate)
Melissa Metzler walks out of the Cambridge Neighborhood in LaPlace Louisiana Wednesday Aug. 29, 2012 carrying her two year old daughter Brianna. The state sent scores of buses and dozens of high-water vehicles to help evacuate about 3,000 people from St. John the Baptist Parish after Tropical Storm Isaac pushed water from lakes Pontchartrain and Maurepas into parts of LaPlace. (AP Photo/Arthur D. Lauck, The Advocate)
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)
Louisiana Gov. Bobby Jindal visits volunteers, media, and residents as the Riverbend Nursing Center is evacuated, Wednesday, Aug. 29, 2012, in Jesuit Bend, La. Plaquemines Parish ordered a mandatory evacuation for the west bank of the Mississippi below Belle Chasse because of worries about a storm surge. The order affected about 3,000 people, including residents of the nursing home. (AP Photo/Eric Gay)
Residents of the Riverbend Nursing Center are evacuated to higher and safer ground as Hurricane Isaac makes landfall, Wednesday, Aug. 29, 2012, in Jesuit Bend, La. Plaquemines Parish ordered a mandatory evacuation for the west bank of the Mississippi below Belle Chasse because of worries about a storm surge. The order affected about 3,000 people, including residents of the nursing home. (AP Photo/Eric Gay)
A rescuer waits for a boat to help rescue people from their flooded homes after Hurricane Isaac made landfall and flooded homes with 10 feet of water in Braithwaite, La., Wednesday, Aug. 29, 2012. In Plaquemines Parish, a sparsely populated area south of the city that is outside the federal levee system, dozens of people were stranded in flooded coastal areas. (AP Photo/Gerald Herbert)
Toccara Williams, of Davant, La., hands their 5-month-old daughter Ra-Maaz Williams to her husband, Romaule Williams Jr., at an evacuation shelter after Isaac made landfall as a Hurricane, in Belle Chasse, La., Wednesday, Aug. 29, 2012. Plaquemines Parish ordered a mandatory evacuation for the west bank of the Mississippi below Belle Chasse because of worries about a storm surge. The order affected about 3,000 people, including a nursing home with 112 residents. (AP Photo/Gerald Herbert)
Water covers a rooftop after Hurricane Isaac made landfall and flooded homes with 10 feet of water in Braithwaite, La., Wednesday, Aug. 29, 2012. (AP Photo/Gerald Herbert)
Brandy Battle, of Davant, La., sits on a cot with her son Patrick Bell, 5, on her 27th birthday and the anniversary of Hurricane Katrina, at an evacuation shelter after Isaac made landfall as a hurricane, in Belle Chasse, La., Wednesday, Aug. 29, 2012. (AP Photo/Gerald Herbert)
Water flows out of the new 17th Street Canal pumping station as Hurricane Isaac hits Wednesday, Aug. 29, 2012, in New Orleans. As Isaac made landfall, it was expected to dump as much as 20 inches of rain in several parts of Louisiana. (AP Photo/David J. Phillip)
Keilani Brown who is 8 months pregnant is rescued from her home on a air bed from the Cambridge Neighborhood in LaPlace, Louisiana with help from Walker Russell, back. The state sent scores of buses and dozens of high-water vehicles to help evacuate about 3,000 people from St. John the Baptist Parish after Tropical Storm Isaac pushed water from lakes Pontchartrain and Maurepas into parts of LaPlace. (AP Photo/Arthur D. Lauck, The Advocate)
Hurricane Isaac caused wide spread flooding in LaPlace, Louisiana sending Kaelen Washington, 7, front, Nadi Hart holding Madison Picou, 1, and Kiana Washington to flee their home. The family members were at a shelter waiting to see if friends could put them up for the night. The state sent scores of buses and dozens of high-water vehicles to help evacuate about 3,000 people from St. John the Baptist Parish after Tropical Storm Isaac pushed water from lakes Pontchartrain and Maurepas into parts of LaPlace. (AP Photo/Arthur D. Lauck, The Advocate)
Helen Blouin holds on tight to Sgt. Julius Cage with the Louisiana National Guard as she is off loaded at a shelter in La Place, Louisiana. The state sent scores of buses and dozens of high-water vehicles to help evacuate about 3,000 people from St. John the Baptist Parish after Tropical Storm Isaac pushed water from lakes Pontchartrain and Maurepas into parts of LaPlace. (AP Photo/Arthur D. Lauck, The Advocate)
Law enforcement officers and first responders help a family to reach dry land after they were rescued from floodwaters caused by Isaac in Pearlington, Miss., Wednesday, Aug. 29, 2012, during a nonstop rain. A number of residents of the small community were trapped by the rising waters and had be rescued or waited until the low tide when waters receded so they could walk out. (AP Photo/Rogelio V. Solis)
Law enforcement officers and first responders help a family to reach dry land after they were rescued from floodwaters caused by Isaac in Pearlington, Miss., Wednesday, Aug. 29, 2012, during a nonstop rain. A number of residents of the small community were trapped by the rising waters and had be rescued or waited until the low tide when waters receded so they could walk out. (AP Photo/Rogelio V. Solis)
Law enforcement officers and first responders help this family to reach dry land after they were rescued from floodwaters caused by Isaac in Pearlington, Miss., Wednesday, Aug. 29, 2012, during a nonstop rain. A number of residents of the small community were trapped by the rising waters and had be rescued or waited until the low tide when waters receded so they could walk out. (AP Photo/Rogelio V. Solis)
Pearlington, Miss., residents are brought out of their flooded community by law enforcement officers and first responders using boats, Wednesday, Aug. 29, 2012, during the nonstop rain from Isaac. A number of residents of the small community were trapped by the rising waters and had be rescued or waited until the low tide when waters receded so they could walk out. (AP Photo/Rogelio V. Solis)
Pearlington, Miss., residents are brought out of their flooded community by law enforcement officers and first responders using boats, Wednesday, Aug. 29, 2012, during the nonstop rain from Isaac. A number of residents of the small community were trapped by the rising waters and had be rescued or waited until the low tide when waters receded so they could walk out. (AP Photo/Rogelio V. Solis)
Waves from Hurricane Isaac batter the a pier, 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)
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)
St. John the Baptist Parish sheriff�s deputies evacuate residents from the River Forest subdivision in LaPlace, La. as wind-driven tides flood the neighborhood Wednesday, Aug. 29, 2012. Isaac arrived exactly seven years after Hurricane Katrina and passed slightly to the west of New Orleans, where the city's fortified levee system easily handled the assault. (AP Photo/The Times-Picayune, Brett Duke) MAGS OUT; NO SALES; USA TODAY OUT
Against the advice of authorities, young people frolic in the high surf on the Lake Pontchartrain lakefront in Mandeville, La. as Isaac batters the north shore with high winds and high tides, Wednesday Aug. 29, 2012. (AP Photo/The Times-Picayune, Ted Jackson) MAGS OUT; NO SALES; USA TODAY OUT
Matt Landry of St. Bernard Parish, center, and Jeff Sancho, with the Air National Guard, right, assist Sharon Sylvia, who is diabetic, into a vehicle as Isaac moves through New Orleans Wednesday, Aug. 28, 2012. (AP Photo/The Times-Picayune, Chris Granger) MAGS OUT; NO SALES; USA TODAY OUT
Matt Landry of St. Bernard Parish carries Sharon Sylvia, who is diabetic, across the top of the Mississippi River levee as Isaac moves through New Orleans Wednesday, Aug. 28, 2012. Jeff Sancho, far left, with the Air National Guard, carries Sylvia's medicines. (AP Photo/The Times-Picayune, Chris Granger) MAGS OUT; NO SALES; USA TODAY OUT
A house at the corner of N. Miro and Columbus Streets in New Orleans collapsed during the height of the Hurricane Isaac destroying three vehicles that where parked alongside it, Wednesday, Aug. 29, 2012. (AP Photo/The Times-Picayune, David Grunfeld)
Michael Ferbosses makes his way home through the wind and rain of Isaac in Chalmette, La.,Thursday, Aug. 30, 2012. Isaac's maximum sustained winds had decreased to 45 mph and the National Hurricane Center said it was expected to become a tropical depression by Thursday night. The storm's center was on track to cross Arkansas on Friday and southern Missouri on Friday night, spreading rain as it goes. (AP Photo/David J. Phillip)