On August 29, 2005, Hurricane Katrina made landfall near Buras–Triumph, Louisiana, as a Category 3 hurricane. Hurricane Katrina was one of the most powerful and devastating tropical cyclones in U.S. history. Originating as a tropical depression over the Bahamas, the storm quickly intensified, becoming a tropical storm and reaching hurricane strength as it crossed southern Florida.
With sustained winds reaching 125 mph (201 km/h). At landfall, hurricane-force winds extended up to 120 miles from the eye, and the central pressure was a notably low 920 mbar. The storm unleashed historic flooding in coastal and low-lying regions. Hurricane surge and torrential rains overwhelmed the levee systems in New Orleans, leading to catastrophic engineering failures. Within days, nearly 80 percent of New Orleans was submerged, in some places under 15 to 20 feet of water. In the Lower Ninth Ward, levee breaches caused particularly severe flooding, largely due to the city's lack of natural protective wetlands, which had been degraded by past engineering projects.
Across the Gulf Coast—including in Alabama and Mississippi—Katrina brought widespread destruction. Coastal Alabama faced intense wind, rain, and a substantial storm surge; in Mississippi, surges reached up to 24–28 feet, particularly near Pass Christian, where waters traveled miles inland.
The human and economic toll was staggering. The hurricane claimed approximately 1,392 lives and caused an estimated $125 billion in damages, making it one of the costliest natural disasters in U.S. history. The massive failure of the levees and floodwalls has been characterized as one of the worst engineering disasters in American history.
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