A flood crest at 23.6 feet is expected on the Mississippi at Hannibal today. Flood stage is 16 feet at Hannibal. The National Weather Service says the river will fall about a foot over the next week. The river is at crest at Quincy, LaGrange and Canton this morning. A crest at 21.9 feet is expected tomorrow at Louisiana. Clarksville has a forecast crest of 32.2 feet, also on Tuesday. River levels are expected to fall a foot or so over the next week.