With Delta, the 2020 hurricane season creeps closer to uncharted territory.
Earlier Friday, it had sustained winds of 115 miles per hour (185 kph), putting it at Category 3 strength.
Delta, the 25th named storm of an unprecedented Atlantic hurricane season, made the record books when it struck the Gulf Coast.
However, heavy rain and flash floods continue to cause problems across much of Louisiana, as well as parts of Texas and Mississippi.
Timothy Schouest adds diesel to his boat's generator in preparation for Hurricane Delta at Bayou Carlin Cove, Thursday, Oct. 8, 2020, in Delcambre, La.
More than 17 inches of rain fell in Iowa, and by 9:30 p.m. Friday, Lake Charles also saw more than 16 inches of rainfall.
As the storm surge began to swell ocean tides along the Louisiana coast on Friday evening, flooding could be seen in some areas of the state, including in the town of Delcambre.
"In this community, there are a lot of homes that were damaged (by Laura), and so a lot of people are concerned about staying in that structure again", Lake Charles Mayor Nic Hunter said in an interview.
But restoration was progressing faster than it did after Laura because Delta's winds were less damaging to the infrastructure, he said.
Delta: Power outages, flash floods plague Louisiana, Texas, Mississippi
While Delta was a weaker storm than Category 4 Laura, it brought significantly more flooding, Lake Charles Mayor Nic Hunter said. Delta rapidly weakened once it moved onto land, and had slowed into a tropical depression Saturday morning.
The hurricane was reported as a Category 4 storm when it hit the Mexican coastline earlier in the week. It was the first Greek-alphabet-named hurricane to hit the continental U.S. And it became the 10th named storm to hit the mainland U.S. this year, breaking a century-old record set in 1916, according to Colorado State University researcher Phil Klotzbach.
This is the sixth time this year that people in Louisiana have had to get ready for an approaching hurricane or tropical storm, while also coping with the coronavirus pandemic.
In the Louisiana city of Lake Charles, flash flood warnings were issued before the landfall.
Delta brought widespread flooding to streets and riverbanks, mostly in southwestern Louisiana, after closely tracking the path of destruction left by the more powerful Hurricane Laura, which came ashore in late August with 241km/h winds.
A Louisiana family gathers in their garage near where a wall was destroyed by Hurricane Laura several weeks ago.
New Orleans, well east of the projected landfall area, was expected to escape Delta's worst impacts.
In Mississippi, Gov. Tate Reeves declared a state of emergency, as did his counterpart Edwards in Louisiana.
He and a colleague planned to ride out the storm from inside a heavy vehicle equipped with a radar dish.
The governor's office said it had no reports of deaths early Saturday, but a hurricane's wake can be treacherous.
The hurricane has been downgraded to a tropical depression over western MS, the NHC said in a briefing note at around 10am local time (15:00 GMT), with winds of 55 kilometres per hour (35 miles per hour).