I lived down there and worked dredging jobs in the MRGO (not Mr GO) for several years . Most pronounced it the Margo or just called it the Outlet. I was on a crewboat there once, and in 12ft seas the window in front of the captain
caved in. Talk about fun.
I can understand how closing it would help protect the NO area. that canal is a direct shot from the gulf into the lower parts
of the city. St. Bernard Parish and the Ninth ward where the canal ends. Alot of ships and barges uses that canal as well as NASA. The facility that builds the big orange fuel tank
for the Shuttle is there. That is one reason the canal was built in the first place. Originally the Saturn V boosters also went thru there I believe.
I will be interested in followintg this story, do you have a link to the announcement