Louisiana and Mississippi took stock Tuesday of the disaster inflicted by powerful Hurricane Ida, as receding floodwaters began to reveal the full extent of the damage along the US Gulf Coast and the death toll rose to four.

New Orleans was under a curfew Tuesday evening, nearly two days after Ida slammed into the Louisiana coast as a Category 4 storm, exactly 16 years after devastating Hurricane Katrina -- which killed more than 1,800 people -- made landfall.

A section of a building's roof is blown off during rain and winds in the French Quarter of New Orleans on August 29, 2021
A section of a building's roof is blown off during rain and winds in the French Quarter of New Orleans on August 29, 2021 AFP / Patrick T. FALLON

Four deaths have been confirmed as crews began fanning out in boats and off-road vehicles to search communities cut off by the giant storm. A man was also missing after apparently being killed by an alligator.

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Images of people being plucked from flooded cars and pictures of destroyed homes surfaced on social media, while the damage in New Orleans itself remained limited.

New Orleans Airport said all incoming and outgoing flights scheduled for Tuesday were canceled, while airlines had scrapped nearly 200 flights on Wednesday.

Ida is seen swirling over the United States at 1150 GMT, on August 30, 2021
Ida is seen swirling over the United States at 1150 GMT, on August 30, 2021 NOAA/GOES / Handout

One person was killed by a falling tree in Prairieville, while a second victim died trying to drive through floodwaters some 60 miles (95 kilometers) southeast in New Orleans, officials reported.

Ida knocked out power for more than a million properties across Louisiana, according to outage tracker PowerOutage.us, most of which still out Tuesday evening, leaving residents without air conditioning in late summer.

Map of the southern United States with the forecast trajectory of Hurricane Ida, which made landfall in Louisiana Sunday.
Map of the southern United States with the forecast trajectory of Hurricane Ida, which made landfall in Louisiana Sunday. AFP / Sophie RAMIS

But power provider Entergy told New Orleans City Council members Tuesday morning that some electricity could be restored as early as Wednesday, the New Orleans Times-Picayune reported.

The first to see power would likely be hospitals -- many of which are dealing with a surge of Covid patients -- and sewage and water treatment centers, the paper reported, saying it could still be days before average customers were reconnected.

Montegut fire chief Toby Henry  walks back to his firetruck after helping cut through trees on the road in Bourg, Louisiana on August 29, 2021
Montegut fire chief Toby Henry walks back to his firetruck after helping cut through trees on the road in Bourg, Louisiana on August 29, 2021 AFP / Mark Felix

Entergy had initially said it could take days to even assess the full extent of the damage.

In Mississippi, which has been buffeted by torrential rain, a road collapse left two people dead and 10 more injured, including three in critical condition, the state's highway patrol said.

The death toll is expected to rise further, Louisiana Deputy Governor Billy Nungesser warned Tuesday, especially in coastal areas directly hit by Ida where search and rescue operations are ongoing.

Meanwhile in St. Tammany Parish, police said a 71-year-old man was attacked and "apparently killed by an alligator while walking in flood waters following Hurricane Ida."

President Joe Biden declared a major disaster for Louisiana and Mississippi, which gives the states access to federal aid.

Louisiana Governor John Bel Edwards said his state had deployed more than 1,600 personnel for search and rescue operations, while the Pentagon said over 5,200 personnel from the military, federal emergency management and National Guard had been activated across several southern states.

Ida -- now a tropical depression -- was travelling northeast, threatening the Tennessee and Ohio Valleys. It was expected in the mid-Atlantic on Wednesday, according to the National Hurricane Center.