TAUNTON, Mass. - A dam on the rain-swollen Mill River deteriorated overnight and Taunton prepared for the worst Tuesday, evacuating residents, canceling classes and closing off downtown amid fears of a wall of water up to 6 feet deep. Mayor Robert Nunes, at a hastily called news conference, said the situation at the wooden Whittenton Pond Dam upstream from the city took a turn for the worse about 2 a.m., resulting in an increase of water flow. "The city of Taunton still is in a state of emergency," Nunes said. "If the dam goes, it will create massive flooding along...