The original source is from the 1950s but it has received some updates as recently as 2010. It's hard to know how many of the post-Katrina changes are included. The map on the adjacent area (Terrebone Bay) does show many of the bigger changes such as the reduction of E. Timbalier island, but it's hard to know which details are updated and which information is older. See:
http://www.oceangrafix.com/chart/zoom?chart=11357