Katrina hit on August 29, 2005. It was not the fiercest storm ever to hit the Gulf Coast, but it so severely battered the inadequate levee system that that protective barrier putatively shielding New Orleans was breached at a tremendous loss of life and property. NOLA has not returned to its former state. Here are updated reports: Fact For Features: Hurricane Katrina 10th Anniversary: Aug. 29, 2015 (Census Bureau); Database of Katrina Federal Spending (Times-Picayune); New Orleans: Ten Years Later (Atlantic); 10 Years After Katrina (The New York Times); An Unfinished Riff (The Wall Street Journal); Hurricane Katrina: 10 Years on (The Guardian); Katrina, 10 Years Later: Three Documentaries to Watch (PBS); and Hurricane Katrina: 10 Years Of Recovery And Reflection.
Selected government reports are here. Also consult Key Documents Regarding the Government Response to Katrina (NYT) as well as Hurricane Katrina: DOD Disaster Response; and Hurricane Katrina: The Public Health and Medical Response (both CRS reports from September 2005).