00:57 Winter Storm Riley Unearths Revolutionary War-era Shipwreck in Maine Winter Storm Riley’s pounding waves unearthed a Revolutionary War-era ship in York, Maine.

At a Glance Winter Storm Riley's impacts continue, with nearly half a million still powerless on Monday.

Coastal flooding is still being reported along North Carolina's Outer Banks.

The winter storm killed at least nine people on the East Coast.

Residents along the Eastern Seaboard began their cleanup from a long, deadly weekend, but on Monday, some areas still were not freed from the coastal flooding that will largely be the legacy of Winter Storm Riley.

High tides along North Carolina's Outer Banks continued to cause coastal flooding, leading to more beach erosion , according to Spectrum News. Flooding forced officials to close Highway 12 between the Bonner Bridge and Rodanthe Monday morning, and the roadway was expected to remain closed into the evening, the Associated Press reported.

The storm, which clobbered areas from the Great Lakes down to the Southeast and all the way up the coast into New England, has been blamed for at least nine deaths. Two of the victims – a 6-year-old boy in Chester, Virginia, and an 11-year-old boy in Putnam Valley, New York – were children.

Nearly half a million homes and businesses remained in the dark Monday morning, according to PowerOutage.us . At the height of the storm, more than 2 million lost power.

(MORE: Here Comes the Next Winter Storm | Another Coastal Storm? )

The governors of Massachusetts, Maryland, New York and Virginia declared states of emergency due to the conditions. National Guard members were activated in New York, Massachusetts and Pennsylvania to assist in the aftermath.

Monday Massachusetts Gov. Charlie Baker said he plans to request federal disaster aid for the damage along the Bay State's coastline, AP reports. He added that once the immediate threat from the wreckage passes, he'll have officials tally up the damages to make the formal request.

From Friday through Sunday, some 4,000 domestic flights were canceled, mostly in the Northeast, according to the flight-tracking website FlightAware .

The storm's widespread impacts were felt as far south as Puerto Rico, where coastal flooding swamped parts of the shoreline Sunday afternoon. Dozens of families had to be evacuated from the Puerto Rico coast, where docks were destroyed, shoreline roads were washed out and three people had to be rescued from a flooded motel, the AP said.

Coastal Flooding, Massive Waves Hammer New England Coast

Serious concerns remained Monday afternoon as heavy surf continued to batter the Massachusetts coastline. In the town of Duxbury, a portion of the seawall collapsed into the ocean, sending water into the streets more than 48 hours after the storm's worst impacts began.

Twenty-five miles down the coast in Sandwich, six homes along the shore will be condemned because of structural damage , Fire Chief William Carrico told the Boston Globe.

Carrico told the Globe that one of the houses "ripped apart and fell into the ocean," and many belongings inside the home were carried away by the sea. "The ocean was crashing into the house," he added.

Up and down the New England coast, officials performed water rescues and responded to reports of wind damage as Riley intensified Friday and Saturday. In Quincy, Massachusetts, floodwaters were so severe that officials had to use front-loaders to rescue residents.

"I'm fortunate to get rescued ," resident Christine Way-Cotter told CBS Boston. "Our house is lifted, so like nothing came into our first floor, but our whole basement is probably six feet under water."

Members of the National Guard, activated by Gov. Charlie Baker ahead of the storm's arrival, assisted in the rescues. In Quincy, where some 100 people were rescued from high water during the storm, residents said it among the worst flooding they'd ever seen.

"I've lived here for five years. I've seen lots of snowstorms, rainstorms, wind, but I have never seen anything like this before," resident Wayne Adams told WBZ-TV . "That kind of flooding, I didn’t think it was possible."

(MORE: Here's Why March Brings the Widest Variety of Extreme Weather )

Many schools remained closed Monday morning across the region as nearly 100,000 homes and businesses remained powerless, according to the AP.

"We saw some of the worst coastal flooding since the 'Perfect Storm' back in 1991," David Cropper, owner of the Cinnamon Rainbows surf shop in Hampton, New Hampshire, told the AP.

At Yale University in New Haven, Connecticut, an unoccupied building partially collapsed early Saturday morning after it was battered by strong winds all day Friday and overnight, WTNH.com reported. No injuries were reported, and the building will be demolished, the report added.

Famed Tree Felled at George Washington's Estate

At George Washington's Mount Vernon estate in Virginia, a 227-year-old Canadian hemlock that was believed to have been planted by the first president was snapped by Riley , according to a Facebook post which broke the news.

It's believed the tree was given to Washington in 1791 by George Clinton, who was governor of New York at the time, Fox News said.

A Virginia cedar that was located near Washington's grave was also brought down by the winter storm, the estate's Facebook page added.

'Pretty Much Everyone ... Threw Up'

United Airlines Flight 3833 had a violent descent into Dulles Airport just after 7 a.m. Friday morning, and the turbulence made virtually every passenger sick.

"Very bumpy on descent. Pretty much everyone on the plane threw up," said a pilot in a report filed with the National Weather Service's aviation center.

(PHOTOS: Winter Storm Riley, in Pictures )

The plane, a CRJ-200 that can hold about 50 passengers, took off from Charlottesville, Virginia, less than an hour before the landing , according to NBC Washington.

The pilots were reportedly close to also vomiting due to the extreme nature of the turbulence, the report also added. Despite the frightening landing, no injuries were reported, NBC Washington also said.

Widespread Wind Damage in D.C. Area

Trees and power lines were downed all across the mid-Atlantic, including the Washington D.C. area. Trees collapsed into roadways and onto homes, and some injuries were reported.

A 100-year-old woman was rescued from her Kensington, Maryland, house after a tree fell through the roof and trapped her overnight Thursday , NBC Washington reported. She was pulled from the debris and hospitalized with non-life-threatening injuries, the report added.

In Suitland, Maryland, located southeast of Washington D.C., a wall collapsed at the Andrews Ridge apartment complex on Friday, the Washington Post said. More than 300 residents were evacuated after strong winds peeled the roofs off several buildings near the complex, and a medic was injured while sitting in an ambulance struck by flying debris, the report added.

Federal offices were closed Friday because of the storm, and residents were urged to stay home.

Travel Advisory Issued, Flights Grounded in New York, New Jersey

As conditions worsened on Friday, Gov. Andrew Cuomo issued a travel advisory for areas north of New York City. The advisory limited travel for certain types of vehicles in some areas and Cuomo asked residents to stay off the roads if possible.

After three tractor-trailers overturned on the Mario Cuomo Bridge, formerly known as the Tappan Zee Bridge, officials banned all buses and trucks from traveling across the span until further notice, the AP reported.

(MORE: 6 Historic Storms That Caused Major Coastal Floods in the East )

<img class="styles__noscript__2rw2y" src="https://dsx.weather.com/util/image/w/28153313_150685588937034_6180159898278428672_n.jpg?v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0" srcset="https://dsx.weather.com/util/image/w/28153313_150685588937034_6180159898278428672_n.jpg?v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 400w, https://dsx.weather.com/util/image/w/28153313_150685588937034_6180159898278428672_n.jpg?v=ap&w=980&h=551&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 800w" > Roof damage to the American Airlines terminal is seen at LaGuardia Airport on Friday, March 2, 2018. (Instagram/Chris Rudnick) (Instagram/Chris Rudnick)

"I have not seen the wind at that strength on any bridge that I've traveled in my time ," driver Bill Morris told CBS News. "It was pretty intense."

Strong winds set adrift several barges carrying construction materials for the bridge, the Journal News reported. Two of the barges ran ashore near Alpine, New Jersey, and another fully sank near the Yonkers wastewater treatment plant. The others were retrieved from the Hudson River.

Hundreds of flights were grounded by the storm Friday. John F. Kennedy International Airport saw more than 420 flights canceled by Friday evening.

LaGuardia Airport saw roughly 600 cancellations , according to the terminal's Twitter page. A video posted on the social media site showed winds tearing what appears to be roofing or a covering off an American Airlines hangar at the terminal.

A spokeswoman for the airline told the AP there were no injuries or planes damaged, and the hangar is still structurally sound.

Officials at Newark Liberty International Airport tweeted there have been more than 480 cancellations .