As a result of the recent action taken by the USACE to deepen the Lower Mississippi River to a federal project depth of 50′, please note the following.

The Associated Federal Pilots and Docking Masters of Louisiana recommend a maximum deep draft, freshwater, as follows:

49′ From Southwest Pass Sea Buoy to MM 104.7 AHP 48′ From MM 104.7 AHP to MM 175 AHP
45′ From MM 175 AHP to 232.4 AHP
4O’ From MM 232.4 AHP to MM 233.8 AHP

See official documentation here.