The flooding appeared to be near a canal on South Maple Avenue and East Jefferson Avenue around 4:30 am.
It wasn't immediately clear what caused the water to flood the roadway. Irrigation officials had responded to the scene to investigate.
Meanwhile, CHP officers have shut down part of Maple Avenue between Jefferson and American Avenues. It's not known when the road will reopen.
Anyone commuting through the area should use an alternative route.
This is a developing story. Stay with Action News for updates.