Hurricane Katrina of the 2005 Atlantic hurricane season was the costliest hurricane,[3][4] as well as one of the five deadliest, in the history of the United States.[5] Among recorded Atlantic hurricanes, it was the sixth strongest overall.
Hurricane Katrina formed over the Bahamas on August 23, 2005 and crossed southern Florida as a moderate Category 1 hurricane, causing some deaths and flooding there before strengthening rapidly in the Gulf of Mexico. The storm weakened before making its second landfall as a Category 3 storm on the morning of Monday, August 29 in southeast Louisiana. It caused severe destruction along the Gulf coast from central Florida to Texas, much of it due to the storm surge. The most severe loss of life occurred in New Orleans, Louisiana, which flooded as the levee system catastrophically failed, in many cases hours after the storm had moved inland.[6] Eventually 80% of the city and large tracts of neighboring parishes became flooded, and the floodwaters lingered for weeks.[6] However, the worst property damage occurred in coastal areas, such as all Mississippi beachfront towns, which were flooded over 90% in hours, as boats and casino barges rammed buildings, pushing cars and houses inland, with waters reaching 6-12 miles (10-19 km) from the beach.
At least 1,836 people lost their lives in the actual hurricane and in the subsequent floods, making it the deadliest U.S. hurricane since the 1928 Okeechobee hurricane. Economist and crisis consultant Randall Bell wrote: "Hurricane Katrina in 2005 was the largest natural disaster in the history of the United States. Preliminary damage estimates were well in excess of $100 billion, eclipsing many times the damage wrought by Hurricane Andrew in 1992."[7]
The levee failures prompted investigations of their design and construction which belongs to the US Army Corps of Engineers (USACE) as mandated in the Flood Control Act of 1965 and into their maintenance by the local Levee Boards. There was also an investigation of the responses from federal, state and local governments, resulting in the resignation of Federal Emergency Management Agency (FEMA) director Michael D. Brown, and of New Orleans Police Department (NOPD) Superintendent Eddie Compass. Conversely, the United States Coast Guard (USCG), National Hurricane Center (NHC) and National Weather Service (NWS) were widely commended for their actions, accurate forecasts and abundant lead time.[8]
Four years later, thousands of displaced residents in Mississippi and Louisiana were still living in trailers. Reconstruction of each section of the southern portion of Louisiana has been addressed in the Army Corps LACPR Final Technical Report which identifies areas not to be rebuilt and areas and buildings that need to be elevated.[9]
| Category 5 hurricane (SSHS) | ||
|---|---|---|
 Hurricane Katrina near peak strength on August 28, 2005 | ||
| Formed | August 23, 2005 | |
| Dissipated | August 30, 2005 | |
| Highest winds |
| |
| Lowest pressure | 902 mbar (hPa; 26.64 inHg) | |
| Fatalities | 1,836 confirmed, 705 missing[1][2] | |
| Damage | $81.2 billion (2005 USD) $88.5 billion (2010 USD) (Costliest tropical cyclone in history) | |
| Areas affected | Bahamas, South Florida, Cuba, Louisiana (especially Greater New Orleans), Mississippi, Alabama, Florida Panhandle, most of eastern North America | |
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