>> that's correct. >> reporter: this is part of the wall that held it back? >> that's correct. >> reporter: we're about 100 miles north of morgan city. about 3:00 central time, 4:00 eastern, if you look about halfway down this flood structure, one of those gates, perhaps two later on today, will be opened up. and all this area that you see out here behind me will begin to fill up with water. fredricka? >> thanks so much, ed. we'll check back with you throughout the day. up river, the state of mississippi is dealing with its worst flooding in decades. floodwaters have swamped lowlying areas around vicksburg, greenville and tunika. and hundreds of homes are evacuated. prime farmland is also under water and an economic lifeblood, casinos are now shut down. and now a new warning from the mississippi state health department. it is telling people to be careful with fish or kraufish from the floodwaters. the water could contain bacteria plus oil, gas, diesel and