"The 30 to 40 people who stayed there are accounted for and safe," he said.
Grand Isle, a resort prized for its sandy beaches — a rarity in marshy coastal Louisiana — is still recovering from the impact of the 2010 BP oil spill. There were no reports of remnant oil washing ashore.
Still Young said he was worried about his communities of Lafitte, Crown Point and Barataria. "We're waiting to see what happens with the Intercoastal Waterway. If it rises 5 to 6 feet we may have challenges there with coastal flooding and tidal flooding."
He wasn't aware of any floods there. "If the wind shifts to the south as expected, we're going to have some challenges."
Despite the overtopping of the levee, which stands 8 ½ feet, Campbell said streets in the area were still passable.
Parish President Billy Nungesser said a portion of the roof of his home on the parish's west bank had blown off. He described wind-driven rain coming into his home as "like standing in a light socket with a fire hose turned on."
Elsewhere, the storm drove sheets of rain through the nearly deserted streets of New Orleans as a population mindful of the powerful punch dealt by Hurricane Katrina seven years ago waited for the storm to get out of their lives. Isaac had stalled along the coast early Wednesday before resuming a move to the northwest several hours later.