According to the Times-Picayune website, the LA Dept. of Transportation has 108 15,000 concrete barriers on the way to New Orleans for use at the levee break.
Kudos to all the state governors who are mobilizing rescue and emergency response teams to send to the effected areas. (My state of PA is one. We're sending several teams from across the state, incl. a team that dealt with flooding in the western PA area last year.)