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UPDATE 12-Rescuers in trucks, helicopters save Texans trapped by Harvey floods

floods@ (Adds details on refinery, electricity outages, fresh quote)

PORT ARTHUR, Texas, Aug 31 (Reuters) - Soldiers and police in helicopters and special high-water trucks on Thursday rescued thousands of Texans stranded by floodwater from Hurricane Harvey, which killed dozens of people as it drenched the Gulf Coast this week.

Some 779,000 Texans had been ordered to evacuate their homes and another 980,000 had fled voluntarily amid concerns that swollen reservoirs and rivers could bring new flooding, according to Department of Homeland Security acting Secretary Elaine Duke.

Harvey roared ashore late Friday as the most powerful hurricane to hit Texas in a half-century but had been downgraded to a tropical depression on Thursday as it headed inland.

Jessica Richard, 24, said she had waited out the storm in her home in Port Arthur until Thursday morning, when water on her street rose to waist-high. She picked up by a passing truck.

"All my family is safe even though there were a few close calls," said Richard, adding that her nephew had been trapped overnight in a flooded apartment with several family members. "He said there were snakes in the water and spiders crawling up the walls. But they got out."

At least 37 people were dead or feared dead in six counties including and around Houston, according to local officials.

In the U.S. energy hub of Houston, which was paralyzed by the storm earlier in the week, firefighters conducted a block-by-block search of homes to rescue stranded survivors and recover bodies.

In Beaumont, Texas, about 80 miles (129 km) east of Houston, doctors and nurses evacuated some 190 people from a hospital that halted operations after the storm knocked out water service in the city of almost 120,000 people.

Orange County, which borders Beaumont, on Thursday ordered remaining residents to evacuate the area amid a forecast that the Neches River would crest on Friday, threatening homes.

Just east of Rose City, Texas, a line of cars and trucks were pushing through water flowing over the Interstate highway. A convoy of civilian volunteers from the ad-hoc "Cajun Navy," who have been carrying out rescues all week, waited as their leader, Phil Drager, negotiated with Texas Highway Patrol officials to stop traffic and allow the group to launch an airboat for a scouting mission.

"Now I can add shutting a major Interstate highway to my resume," Drager said.

AMID FLOODS, NO DRINKING WATER

Ryan House, 44, and his 79-year-old mother, Sally, traveled to Baptist Beaumont Hospital to pick up medicine, only to find a full evacuation in process.

"I have just enough medicine for now," House said as he turned and walked back to his car in the city.

While some 32,000 people across the region had headed to emergency shelters, the Houses planned to remain in their home.

"We got a couple big 5-gallon jugs from our neighbor who has a hot tub and we are using that to flush the toilets," said Sally House.

U.S. Vice President Mike Pence visited Texas on Thursday, touring the coastal city of Rockport, where Harvey slammed ashore onto the mainland late Friday.

"The American people are with you. We are here today, we will be here tomorrow and we will be here every day until this city and this state and this region rebuild bigger and better than ever before," Pence told a crowd outside a Rockport church damaged by the storm.

Moody's Analytics estimated the economic cost from Harvey for southeastern Texas at $51 billion to $75 billion, ranking it among the costliest storms in American history.

The event has drawn comparisons to 2005's Hurricane Katrina, which killed more than 1,800 people in New Orleans. Then-President George W. Bush's administration was widely criticized for the haphazard initial response to that storm, and the Trump administration was taking care to be seen as responding quickly to the first major natural disaster it has faced.

President Donald Trump was to return to the region on Saturday.

PLANT EXPLOSIONS, ENERGY MARKETS RATTLED

Gasoline futures soared more than 13 percent on Thursday, as almost a quarter of U.S. refining capacity had been knocked offline by the storm, raising fears of fuel shortages.

About 189,000 homes and businesses remained without power.

Early Thursday, explosions could be heard at a chemical plant in Crosby, Texas, owned by Arkema SA. Refrigeration systems failed in a truck storing volatile chemicals, which ignited as they warmed, sending smoke plumes 40-feet (12-meters) into the air, according to company and public safety officials.

After the blasts, local public safety and company officials insisted there was no risk to the public outside the 1.5-mile (2.4-km) safety perimeter, even though they said eight more trucks storing the same chemicals would eventually catch fire.

The U.S. Environmental Protection Agency said in a statement that the amount of toxic materials released appeared to be too small to present a public health concern.

Some signs of normal life returned to Houston, the nation's fourth most populous city. Businesses reopened and shelter residents headed out to check on their flooded homes.

For some, the experience proved to be heartbreaking.

Anita Williams, 52, was lined up at a shelter at Houston's George R. Brown Convention Center to register for aid from the Federal Emergency Management Agency.

She said she had returned to her neighborhood on Wednesday to survey the damage to her one-story house.

"It's not my house anymore," Williams said, her voice breaking. "My deep freezer was in my living room."

(Additional reporting by Richard Valdmanis, Marianna Parraga, Gary McWilliams, Ernest Scheyder, Erwin Seba, Ruthy Munoz and Andy Sullivan in Houston, Ben Gruber in Crosby, Texas, Emily Flitter in Orange, Texas, David Gaffen and Christine Prentice in New York, Susan Heavey in Washington, Jon Herskovitz in Austin, Texas, and Brendan O'Brien in Milwaukee; Writing by Scott Malone; Editing by Jonathan Oatis and Andrew Hay)