After Hurricane Katrina, the U.S. Army Corps of Engineers constructed a complex of control structures at Caernarvon in St. Bernard Parish. The new Caernarvon Sector Gate includes a 56 foot-wide navigable sector gate at a height of 26 feet above sea level. The adjoining floodwalls are intersected by land based floodgates across Highway 39 and the Norfolk Southern Railroad tracks. It ties the 23 miles of new floodwalls in St. Bernard Parish to the Mississippi River Levee at the southeast end of the Hurricane and Storm Damage Risk Reduction System (HSDRRS).