In Braithwaite, residents assessed the damage. "Just look at that, everything completely submerged," said Jimmy Delery, 57, a land and property owner as he inspected Braithwaite's rooftops from a motorboat. "We thought we knew so much about hurricanes, but we're learning so much more."
Residents without boats waited on higher ground for the water to recede. Officials used a digger to claw a hole in the town's earthen levee to speed up the draining.
"I'm doing OK for now but I know it'll hit me when I get in there and see my home," said Melanie Martinez, who was rescued from her rooftop on Wednesday with her family soon after Isaac made landfall. "We thought we were going to die in that house; the water was coming up so fast."
Two neighbors did not make it. The bodies of the man and woman, who were not immediately named, were found in a kitchen, apparently drowned.
A $14.5 billion federal flood defense upgrade since the 2005 Katrina catastrophe, when 1,800 peopled died, was credited with averting serious damage in New Orleans but semi-rural communities on its outskirts such as Braithwaite relied on a more basic, state-built 8ft levee which proved no match for the waters.
Many residents said the higher defenses around New Orleans channeled the surge to them. "All that water had to go somewhere. Well, it came here," said Eric Desalvo, 20.
The storm also damaged a dam on Lake Tangipahoa in Mississippi, prompting concerns on Thursday it could break, but authorities late said an intentional, controlled breach neutralized the danger.
Intellpuke: You can read this article by Guardian U.S. Correspondent Rory Carroll, reporting from Braithwaite, Louisiana, in context here: www.guardian.co.uk/world/2012/aug/31/hurricane-isaac-louisiana-federal-aid