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Meanwhile, an environmental crisis could be on the horizon in southern Louisiana. The fresh water rolling into the Gulf of Mexico could pose a serious setback for the badly damaged oyster industry, struggling to recover from last year's BP oil spill. Too much fresh water can kill oysters. "The worst is not over yet," said John Tesvich, the chairman of the Louisiana Oyster Task Force, an industry group. "We're starting to see fresh water in various areas. The next couple of weeks will be critical." The floodwaters have been the highest on record at more than half of the gauges along the fortress-like levee system built up between Missouri and Louisiana. Sandbags and emergency barriers have been placed around towns, at gaps in the levee system, and around businesses, power facilities and other critical infrastructure. So far, the Army Corps of Engineers is confident its flood system will hold up. And it's performed well so far, though crews up and down the river have had to chase sand boils
-- where water undercuts the levee and land on the other side seems to boil. There will be a lot to watch over the coming weeks. Engineers say levees are weakened when floodwaters recede and erode the earthen ramparts. Also, there is the possibility for water levels to rise again as more storms dump water into the Mississippi River valley.
At the southern end of the Atchafalaya River, there was a guarded sense of relief last week as the corps began closing bays at the Morganza spillway, source of the water threatening Morgan City, an oil and seafood town of about 10,000 people. The Atchafalaya's expected crest Monday was forecast to reach levels not seen since the landmark 1973 flooding in the Mississippi Valley. Morgan City was on guard as the crest approached. Morgan City Mayor Tim Matte said the 24-foot floodwall protecting the city was doing its job. The larger fear, he said, was the possible overtopping of levees at Lake Palourde as a result of backwater flooding. "Within a day or so of (the cresting) you'd pretty well be convinced, OK, we're not going to have an overtopping. Now, all we need to do is make sure our levees are in good shape," he said. The American Waterways Operators, which represents the U.S. barge industry, said conditions are slowly returning to normal on the Mississippi. However, traffic restrictions, including the number of barges that can be towed at once, remain in effect, said AWO spokeswoman Anne Burns. Most of the backup has cleared, but traffic is still moving slowly to ensure the levees aren't damaged, she said. Barges haul grain and other farm products from the Midwest to the Port of South Louisiana, where they are loaded on ocean-going vessels for exports or stored in grain elevators to await shipping.
[Associated Press By HOLBROOK MOHR]
Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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