A vehicle is submerged in floodwaters in Youngsville, La., Sunday, Aug. 14, 2016. Louisiana Gov. John Bel Edwards said Sunday that at least 7,000 people had been rescued so far. He declared a state of emergency Saturday, calling the floods “unprecedented” and “historic.” (Scott Clause/The Layfayette Advertiser via AP)

Motorists on Highway 190 drive through deep water through Holden, La., after heavy rains inundated the region, Sunday, Aug. 14, 2016. Louisiana Gov. John Bel Edwards said Sunday that at least 7,000 people have been rescued so far. (AP Photo/Max Becherer)

Residents drive through a flooded area near Tickfaw, La., after heavy rains inundated the region, Sunday, Aug. 14, 2016. Louisiana Gov. John Bel Edwards said Sunday that at least 7,000 people have been rescued so far. (AP Photo/Max Becherer)

A sign tells motorists to slow down to avoid pushing water into homes near Holden, La., after heavy rains inundated the region, Sunday, Aug. 14, 2016. Louisiana Gov. John Bel Edwards said Sunday that at least 7,000 people have been rescued so far. (AP Photo/Max Becherer)

An abandoned vehicle is surrounded by water on Highway 190 near Holden, La., after heavy rains inundated the region, Sunday, Aug. 14, 2016. Louisiana Gov. John Bel Edwards said Sunday that at least 7,000 people have been rescued so far. (AP Photo/Max Becherer)

Floodwaters reach the front steps of homes built on pillars near Holden, La., after heavy rains inundated the region, Sunday, Aug. 14, 2016. Louisiana Gov. John Bel Edwards said Sunday that at least 7,000 people have been rescued so far. (AP Photo/Max Becherer)

Floodwaters reach the front steps of a home near Holden, La., after heavy rains inundated the region, Sunday, Aug. 14, 2016. Louisiana Gov. John Bel Edwards said Sunday that at least 7,000 people have been rescued so far. (AP Photo/Max Becherer)

In this aerial photo over Robert, La., Army National Guard, vehicles drive on flooded U.S. Route 190 after heavy rains inundated the region, Saturday, Aug. 13, 2016. Louisiana Gov. John Bel Edwards says more than 1,000 people in south Louisiana have been rescued from homes, vehicles and even clinging to trees as a slow-moving storm hammers the state with flooding. (AP Photo/Max Becherer)

In this aerial photo a boat motors between flooded homes after heavy rains inundating the region Saturday, Aug. 13, 2016, in Hammond, La. Louisiana Gov. John Bel Edwards says more than 1,000 people in south Louisiana have been rescued from homes, vehicles and even clinging to trees as a slow-moving storm hammers the state with flooding. (AP Photo/Max Becherer)

Louisiana Gov. John Bel Edwards, second left, and Baton Rouge Police Chief Carl Dabadie, Jr., third from right, applaud during funeral services for Baton Rouge police Cpl. Montrell Jackson at the Living Faith Christian Center in Baton Rouge, La., Monday, July 25, 2016. Jackson, slain by a gunman who authorities said targeted law enforcement, is the last of the three Louisiana law enforcement officers killed in last week's ambush to be buried. (Patrick Dennis/Baton Rouge Advocate via AP, Pool)

Louisiana Gov. John Bel Edwards speaks during funeral services for Baton Rouge police Cpl. Montrell Jackson at the Living Faith Christian Center in Baton Rouge, La., Monday, July 25, 2016. Jackson, slain by a gunman who authorities said targeted law enforcement, is the last of the three Louisiana law enforcement officers killed in last week's ambush to be buried. (Bill Feig/Baton Rouge Advocate via AP, Pool)

Louisiana Gov. John Bel Edwards, speaks during funeral services for Baton Rouge police Cpl. Montrell Jackson at the Living Faith Christian Center in Baton Rouge, La., Monday, July 25, 2016. Jackson and multiple police officers were killed and wounded July 17, in a shooting near a gas station in Baton Rouge, less than two weeks after a black man was shot and killed by police here, sparking nightly protests across the city. (Patrick Dennis/Baton Rouge Advocate via AP, Pool)

Louisiana Gov. John Bel Edwards, center facing, greets visitors during funeral services for Baton Rouge Police officer Matthew Gerald at the Healing Place Church in Baton Rouge, La., Friday, July 22, 2016. More than 2,000 people packed the church where Mayor Kip Holden and other leaders eulogized Gerald, the first of three officers slain by a lone gunman to be laid to rest. (Bill Feig/Baton Rouge Advocate via AP, Pool)

Louisiana Gov. John Bel Edwards and his wife Donna Edwards listen during funeral services for Baton Rouge Police officer Matthew Gerald at the Healing Place Church in Baton Rouge, La., Friday, July 22, 2016. More than 2,000 people packed the church where Mayor Kip Holden and other leaders eulogized Gerald, the first of three officers slain by a lone gunman to be laid to rest. (Brianna Paciorka/Baton Rouge Advocate via AP, Pool)

Louisiana Gov. John Bel Edwards wipes his eyes at a news conference regarding the shooting of police officers, in Baton Rouge, Monday, July 18, 2016. Multiple police officers were killed and wounded Sunday morning in a shooting near a gas station in Baton Rouge, less than two weeks after a black man was shot and killed by police, sparking nightly protests across the city. (AP Photo/Gerald Herbert)