Isabel made a swift flight across the Mid-Atlantic, but its devastation promises to be slow to overcome: Millions were still without power, debris blocked streets, and flooding left drinking water contaminated. Federal officials warned of new flooding as runoff from the storm pours into streams. Power companies reported large gains in the hard task or restoring service to about 6 million homes and businesses from North Carolina's Outer Banks north to New York, but more than 2 million still toiled in darkness. At least 30 deaths had been blamed on the storm, 17 of them in Virginia. North Carolina, Virginia, Maryland and Delaware were declared federal disaster areas.