Will the levees hold?

When a barge evidently busted the industrial canal levee near Tennessee Street in the fury of hurricane Katrina, it flattened 800 feet of the massive metal walls, causing an enormous wave that wiped out six blocks of homes and destroyed most of this New Orleans East neighborhood.

Today, the breach is patched, at least temporarily. But the levee is weakened for miles, and engineers worry that makeshift repairs - tons of sand that fill the gap, about 10 feet lower than the rest of the levee - won't withstand even a mild wave.

Now, as hurricane Rita steams toward Texas, it isn't hurricane-force winds that scare this city so much as the prospect of buckets of rain.

The Army Corps of Engineers say the levees can handle just 6 inches of rain and a storm surge of 10 to 12 feet.

"If the storm surges come up, this will all wash right into the neighborhood," says Capt. Ron Beaulieu of the New Orleans Fire Department, as he stands on the sand walls of the Industrial Canal patch. He points to the deep trench that formed in the mud along the still-standing levee walls. "All the levees are like this. They're really weakened."

Potential for renewed flooding was on everyone's minds in New Orleans this week as Mayor Ray Nagin halted his ambitious repopulation plan and asked just-returned residents to evacuate again.

Even as New Orleans finally declared itself free of the floodwaters that once covered 80 percent of the city, officials here are bracing for the prospect of more - and hoping that, if the worst does come to pass, they'll be better prepared this time.

Lines of cars with residents hoping to return and clean out their homes have been turned around on I-10. And across the city, the hum of cleanup and response activity is slowing, as everyone from animal rescuers to the National Guard takes stock of Rita's approach.

"Everyone's going to Alexandria [La.] to ride out the storm," says Col. Ken Lull of the Colorado National Guard's169th field artillery brigade. Col. Lull got married Sept. 3 and jokes that he's spending his honeymoon in New Orleans. He's in charge of the task force for the hard-hit St. Bernard Parish. "With this levee out here, we can't be here [if it breaks] - then we become casualties."

Military units across the region repositioned themselves with Rita in mind. Marines who've spent the last few weeks setting up food distribution and cleaning out schools in Mississippi and Louisiana boarded the Iwo Jima ship in downtown New Orleans to ride out the storm and go wherever they might be most needed.

And most of the 1,850 soldiers with the Oregon National Guard, part of a task force responsible for Lakeview, the Ninth Ward, and other severely damaged New Orleans neighborhoods, loaded onto contracted buses to wait out the storm in Alexandria, northwest of the Big Easy.

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