The neighborhood of Chalmette sits underwater on Sept. 11, 2005, in St. Bernard Parish, New Orleans, Louisiana. The channel was closed in 2009 and a 22-mile levee system around St. Bernard Parish was completed in 2018. Levees and permanent storm surge barriers were built in St Bernard Parish after Hurricane Katrina to protect flooding from the Mississippi River-Gulf Outlet on August 20, 2025 in St. Bernard, Louisiana. St. Bernard Parish residents and leaders hope that will, eventually, bring the community fully back, 20 years after Hurricane Katrina. Transcript: AILSA CHANG, HOST: Hurricane Katrina flooded nearly every building in St. Bernard Parish, east of New Orleans.