Hurricane Katrina was the largest, most costly, and destructive hurricane to hit the United States, making landfall as a Category 5 storm along the Gulf Coast in August 2005. It caused catastrophic flooding as levees failed in New Orleans, submerging 80% of the city and displacing millions along the coasts of Louisiana, Alabama, and Mississippi. Over 1,800 people lost their lives and property damage totaled an estimated $108 billion, rendering it the costliest natural disaster in U.S. history.