Mass evacuation as rain strains tallest US dam

Almost 200,000 people were under evacuation orders in northern California Monday after a threat of catastrophic failure at the United States' tallest dam. Officials said the danger had subsided for the moment as water levels at the Oroville Dam, 75 miles (120 kilometers) north of San Francisco, had eased. The threat comes not from the dam itself, which the California Department of Water Resources said was not in danger of collapse, but from an emergency spillway that channels excess water.