"Thousands of people in Louisiana have lost everything they own and need our help now," said Brad Kieserman, the aid group's vice president of disaster services operations and logistics.
"This disaster is the worst to hit the US since Superstorm Sandy, and we anticipate it will cost at least USD 30 million - a number which may grow as we learn more about the scope and magnitude of the devastation."
The calamity struck quickly and ferociously. In one part of Livingston Parish,more than 31 inches of rain fell in 15 hours.
At least 13 people have died across five parishes. And with more rain forecast, the destruction could mount.
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President Barack Obama has directed Federal Emergency Management Agency (FEMA) Director Craig Fugate to "utilise all resources available to assist in the response and recovery," the White House said.
Obama has declared at least 20 parishes as disaster areas.
The president "wants to ensure that his presence does not interfere with ongoing recovery efforts"; the governor hadpreviously saidhe wasn't upset that the president hadn't announced plans to visit, for precisely that reason, White House Press Secretary Josh Earnest said in a statement.
The US Coast Guard, National Guard, local emergency responders and even neighbours have helpedrescue more than 30,000 residentsand 1,400 pets.
On Thursday, some residents returned to their homes, only to find their belongings soaked and destroyed.
Heaps of drenched furniture, mattresses and toys were piled up on lawns as owners struggled to find anything salvageable.
He called on volunteers to help clean out mud from homes.
The Red Cross has also asked for donations to help more than 7,000 people in emergency shelters. "Thousands more are without power in hot, humid conditions," the aid group said.
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