People work to clear water and mud from the driveway of a home on Sept. 9, 2014, in Overton, Nev.

A horse splashes in floodwater after it was rescued from a flooded pen on Sept. 9, 2014, in Overton, Nev.

A bulldozer works on a flood damaged section of Interstate 15, Sept. 9, 2014, near Moapa, Nev. Flood damage caused the closure of the interstate which is the main road between Las Vegas and Salt Lake City.

Melanie Vallet and Madison Bush rescue a mule caught in floodwater, Sept. 9, 2014, in Overton, Nev. The flood water came from heavy rain Monday that also washed out parts of Interstate 15.

Cars are stuck in flood waters on I-10 east at 43rd Ave. after heavy storms pounded the Phoenix area, flooding major freeways, prompting several water rescues and setting an all-time single-day record for rainfall in the desert city, Sept. 8, 2014.

Steven Martinez of Western Towing prepares to lift a vehicle stranded in about two feet of water in Phoenix, Arizona on Sept. 8, 2014.

A section of Scottsdale, Ariz. appears flooded following heavy rains that left motorists stranded during their morning commute on Sept. 8, 2014.

A car is partially buried in mud on Interstate 15 in Moapa, Nev., Sept. 8, 2014.

A dismayed Nick Kriaris wades through his flooded home after heavy rains caused severe flash flooding, Sept. 8, 2014, in Phoenix. His home has flooded three times in the past month, and he had just fixed the damage in his home from the previous two monsoon storm floodings when the storm hit.

A truck crosses floodwaters on a road in Moapa, Nev., Sept. 8, 2014.

Receding flood water surrounds a home in Moapa, Nev., Sept. 8, 2014.

Two residents of a Chandler neighborhood kayak down a flooded street after record breaking rains closed streets, highways and schools, Sept. 8, 2014, in Chandler, Ariz.

Water flows down the middle of Interstate 15 in Moapa, Nev., Sept. 8, 2014.

Horses walk through flood water behind a home in Moapa, Nev., Sept. 8, 2014.

Floodwaters surge, Sept. 8, 2014, in Scottsdale, Ariz.

Construction worker Jason Haight Jr. makes his way back home, through high water at 54th Street and Camelback Avenue, Sept. 8, 2014, in Phoenix. Haight and his father rode to their construction site only to find work canceled for the day.

A truck creates a wake as its driver tries to navigate a severely flooded street as heavy rains pour down, Sept. 8, 2014, in Phoenix.

Jim Sampson retrieves items from his 2002 Toyota Corolla stuck in flood waters on I-10 east at 43rd Ave. after monsoon rains flooded the freeway in Phoenix, Sept. 8, 2014. Heavy storms pounded the Phoenix area early Monday, flooding major freeways, prompting several water rescues and setting an all-time single-day record for rainfall in the desert city.

Cars are stuck in flood waters on I-10 east at 43rd Ave. after monsoon rains flooded the freeway in Phoenix, Sept. 8, 2014.

Arizona Department of Transportation worker Carlos Parra looks for drains to clear flood waters on I-10 east at 43rd Ave. on Sept. 8, 2014.

Drivers attempt to navigate their vehicles through severely flooded streets as heavy rains pour down, Sept. 8, 2014, in Phoenix.

A student tries to walk along a flooded sidewalk to a non-flooded street so he can be picked up by his parents after schools were closed due to severe flooding on Sept. 8, 2014, in Phoenix.

Flood waters rush into a street as a vehicle moves into deeper flash flood waters, Sept. 8, 2014, in Phoenix.

A driver tries to navigate a severely flooded street as heavy rains pour down, Sept. 8, 2014, in Phoenix.

Flood waters cross a flooded street and wash away a sidewalk as heavy rains pour down, Sept. 8, 2014, in Phoenix.