Update

So the Senate and the House have given the Army Corps the go ahead to close the Mississippi Riveer Gulf Outlet, the 76-mile canal that has been a really awful project for New Orleans since it's creation in 1965. It's destroyed hundreds of acres of wetlands, cost taxpayers up the whazoo, helped Katrina destroy the Lower Ninth and St. Bernard in its own right, and indirectly (wetlands destrution) and not even been economically profitable for the powers that be.

Most likely, the last one is the reason it's being closed. I heard Lyndon Johnson's family bought up all the wetlands in St. Bernard Parish after Hurrican ripped through in 1965, and it was Johnson himself that built MRGO to provide a more direct route for ships to the Gulf from New Orleans.