Officials with St. John the Baptist Parish held a press conference Monday night, saying “almost 800 people” have been rescued after extreme flooding due to Hurricane Ida.

“This is one of the worst natural disasters I've ever seen in St. John,” Parish President Jaclyn Hotard said.

Remarkably, Hotard said there have been no reported fatalities in the parish from the storm.

“All of the missions were successful,” Hotard said. “Every call that came in for someone to be rescued out of their home, they have been rescued out of their home.”

The hard-hit town of Laplace is in St John the Baptist Parish.

-ABC News' Matt Foster

Tulane University announced Monday night that it would cancel all in-person classes until Oct. 6.

The campus is closed and all classes will be canceled until Sept. 13, the university tweeted. The semester began last week.

The school is establishing a hub in Houston to provide food and lodging at Tulane’s expense for students until they can get flights home.

"Beginning tomorrow at 10AM, we will evacuate all remaining students (undergraduate & graduate; in-residence & off-campus) to Houston via bus," the school tweeted.

Emergency funds will also be available for students, according to Tulane.

Deano Bonano, a councilman for District 2 in Jefferson Parish, told ABC News that there has been one confirmed fatality in his parish from Hurricane Ida.

Details about the death and the identity of the victim weren't immediately available.

-ABC News' Darren Reynolds

An anticipated storm team of more than 20,000 and growing has begun assessing Ida's damage and restoring power, according to Louisiana's utility companies.

Damage assessment could take several days, since many areas are currently inaccessible either by roadways, officials at Entergy Louisiana said Monday afternoon.

While 90% of customers will be restored sooner, customers in the hardest-hit areas should plan for the possibility of experiencing extended power outages, according to Entergy.

"This will be a marathon, not a sprint," Deanna Rodriguez, Entergy New Orleans' president and CEO said in a statement.

Louisiana Gov. John Bel Edwards provided another update on the damage from Hurricane Ida Monday evening.

Edwards said the state is still in a search and rescue mode as torrential rain and strong winds from the tropical depression continue to hit the state.

He said the entire southeastern section of the state is without power and over 1 million people are affected.

"There are an awful lot of unknowns right now," Edwards said. "I can't tell you when the power is going to be restored."

Edwards said the priority is to restore electricity to critical infrastructure and services, such as hospitals and dialysis centers.

Three hospitals were evacuated and a fourth is in the process of moving their patients, according to the governor.

Edwards said there was a "silver lining" from the storm in that there have been no reports of breached levees. There may have been a few levees where water overflowed, but the levees held up in critical locations, including New Orleans, according to the governor.

"They did not fail," he said.

Edwards urged homeowners who evacuated to not return to their homes until their parish leaders give the all-clear.

The Louisiana National Guard rescued 191 citizens and 27 pets so far across Jefferson, St. John the Baptist and Orleans parishes, Edwards said. They are conducting more sweeps through the affected areas.

The governor urged homeowners in affected areas to stay safe, as most hurricane fatalities take place long after the storm hits. He reminded people to use generators outside their houses, avoid driving through deep waters and not exert themselves during cleanups.

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Edwards did warn that he expects the death toll to rise, but said the numbers won't be as high if people heed warnings.

"This is a tough blow, but things are going to be OK," he said.