Damage to remote Alaska villages hammered by flooding last weekend is so extreme that many of the more than 2,000 people displaced won’t be able to return to their homes for at least 18 months, Gov. Mike Dunleavy said in a request to the White House for a major disaster declaration.

In one of the hardest hit villages, Kipnuk, an initial assessment showed that 121 homes — or 90% of the total — have been destroyed, Dunleavy wrote. In Kwigillingok, where three dozen homes floated away, slightly more than one-third of the residences are uninhabitable.

Officials have been scrambling to airlift people from the inundated Alaska Native villages. More than 2,000 people across the region have taken shelter — in schools in their villages, in larger communities in southwest Alaska or have been evacuated by military planes to Anchorage, the state's largest city.

Anchorage leaders said Friday they expect as many as 1,600 evacuees to arrive. So far about 575 have been airlifted to the city by the Alaska National Guard, and have been staying at a sports arena or a convention center. Additional flights were expected Friday and Saturday.

Officials are working on figuring out how to move people out of shelters and into short-term accommodations, such as hotels, and then longer-term housing.

The storm surge pummeled a sparsely populated region off the state's main road system where communities are reachable only by air or water this time of year.

The villages typically have just a few hundred residents, who hunt and fish for much of their food, and relocating to the state's major cities will bring a vastly different lifestyle.