IT WAS BAD!!!
Hurricane Katrina was rated the 3rd most deadly hurricane on records. The reason so many people died in Louisiana at least is because the levees (an embankment built to prevent the overflow of a river) broke, which caused flooding and death by drowning. Many people also died of injury or trauma.
(Below is a picture of a levee in Missouri)
(Anyone who got the Category 5 part of it)