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nothing. i mean, it's not even a puddle down at the bottom. >> reporter: they're looking for four distinct threats to a levee and floodwall system like the one keeping the mississippi out of the streets of memphis. first, overtopping. that's lapping over the top. the army corps says that threat has passed and, in fact, the river could rise another six feet before going over the floodwall. second, erosion of the levees. tonight, those dirt berms remain strong. then the floodwalls protecting downtown. they too appear to be holding. the fourth and final threat are those sand boils. even now eroding the levees from underground. >> we're going to wait till the water goes down a whole lot more, and then we'll celebrate success. >> reporter: the mississippi surged past karol, illinois, where the army corps blew up a levee to relieve pressure, flooding farmland. now the river is cresting in memphis today. then it's expected to be at full height in vicksburg, mississippi, by wednesday morning, and crest in baton rouge by thursday.