"There is a strong potential that those who live within the 1-mile evacuation area of the Cape Fear River will be impacted by flooding", the city said in a statement.
In the town of Fair Bluff, North Carolina, which has struggled to recover from the devastation of Hurricane Matthew in 2016, only about 50 residents remained on Tuesday, Fair Bluff Police Chief Chris Chafin told Reuters.
More than 1,100 roads were still closed across North Carolina, Governor Roy Cooper said on Tuesday, including portions of Interstates 40 and 95.
Russell Maloy walks over a rail track bridge near his home to check the level of the Cape Fear River which has been rising in the aftermath of Hurricane Florence in Fayetteville, North Carolina.
One road was opened into Wilmington at least briefly, officials said, and items have been brought into the city by big military trucks and helicopters, which also have been used to pluck hundreds of harried people from atop homes and other structures.
At least 32 people have been killed since Florence came ashore as a hurricane on Friday, including 25 in North Carolina and six in SC.
"And the days and the months and even years ahead to make sure we build back to where we need to be here in North Carolina".
Still, it displaced thousands of people and caused extensive property damage.
The river swallowed trees, lamp posts and a parking lot near its banks.
Utility crews from multiple states worked to restore power, and outages were down from a high of more than 900,000 to about 320,000 homes and businesses, almost all in North Carolina. Businesses were re-opening and owners were removing sandbags and plywood from storefronts.
Human and animal waste is mixing with the swirling floodwaters, which have killed about 3.4 million chickens and 5,500 hogs on farms.
The governor said 16 rivers statewide were at major flood stage and more than 1,100 roads were closed. He also said that Democrats would start to criticize the government response to the storm, and "this will be a total lie, but that's what they do, and everybody knows it!"
Six people were also killed in SC and one in Virginia, reports said.
Duke's handling of ash waste has faced intense scrutiny since a drainage pipe collapsed under a waste pit at an old plant in Eden in 2014, triggering a massive spill that coated 70 miles (110 kilometers) of the Dan River in gray sludge. More than 300,000 across the state remained without power as of Tuesday morning, according to Duke Progress Energy.