The area around a huge dam at California’s second-largest reservoir is in a state of emergency, with some 180,000 residents ordered to evacuate the area Sunday out of fears that part of Oroville Dam could fail. A glimmer of hope arrived late Sunday night, when officials said water had finally stopped pouring over the dam’s emergency spillway. The secondary spillway was in use because the main spillway had developed a huge hole, stressed by the need to release water accumulated from California’s wet winter — and brought to a new crisis point by last week’s heavy rains.