More than 7.6 million homes and businesses are without power throughout the eastern U.S. as post-tropical storm Sandy leaves a path of destruction, at least 34 dead, and a record-breaking storm surge that has flooded parts of the Eastern Seaboard, including New York City.
New York City, which saw a four-metre storm surge, has counted at least 10 deaths, and Mayor Michael Bloomberg said he expects that toll will rise.
"In addition to the lives we lost, the damage we suffered across the city is clearly extensive and it will not be repaired overnight," Bloomberg told reporters.
"This was a devastating storm, maybe the worst that we have ever experienced," he said.
He said the city faces "enormous" challenges to get its public transit and power transmission systems back in operation.
U.S. President Barack Obama has declared a major disaster in parts of New Jersey and New York.
The declaration makes federal funding available to people in the area, which bore the brunt of the sea surge from the superstorm.
Standing along the banks of the Hudson River near Battery Park in Lower Manhattan, CBC's David Common said seven subway tunnels are full of water but the pumping process cannot begin due to power outages.
"This is really an island cut off right now," Common said.
The list of U.S. deaths included 17 in New York state, plus three in New Jersey, and four in Pennsylvania. Deaths were also reported in Connecticut, Maryland, North Carolina and West Virginia.