A man was killed and federal authorities reported "catastrophic" damage in parts of southeast Louisiana on Sunday night after Hurricane Ida crashed into the state as what the governor said was "one of the strongest storms to make landfall here in modern times."

All of New Orleans was without power, the city's electric utility said, threatening its sewage system.

The state Health Department said a 60-year-old man died in Ascension Parish after a tree fell on his home. The parish sheriff's office said deputies who were dispatched at 8:30 p.m. for a report that a person may have been injured in Prairieville, about 15 miles southeast of Baton Rouge, confirmed that a person was dead.

Citing local law enforcement, the National Weather Service office in New Orleans said over 200 people were in "imminent danger" in the town of Jean Lafitte and the unincorporated community of Lafitte, in Jefferson Parish, after a levee failed.

"Move to higher ground now!" the weather service said. "This is an extremely dangerous and life-threatening situation."

The latest on Hurricane Ida:

Hurricane Ida made landfall Sunday, the 16th anniversary of Hurricane Katrina, as a Category 4 storm near Port Fourchon, Louisiana. Gov. John Bel Edwards described it as "one of the strongest storms to make landfall here in modern times."

Ida weakened to a Category 1 storm with top sustained winds of 95 mph late Sunday. The National Hurricane Center reported "catastrophic damage" and warned of "extremely life-threatening" storm surges. Authorities said a 60-year-old man was found dead after a tree fell on his home. A levee failure was reported in Jefferson Parish, threatening 200 people, authorities said.

All flights were canceled at Louis Armstrong New Orleans International Airport. A little over 1 million homes and businesses were without power across the state; Entergy New Orleans, the city's main power utility, said all of Orleans Parish was without service.

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At midnight, Ida had weakened from a Category 4 to a Category 1 storm, with sustained winds of 95 mph, but authorities said it would remain a hurricane overnight. The National Hurricane Center said tornadoes were expected into Monday from southeast Louisiana to the western Florida Panhandle.