Sandy is correct; there is no curfew on the Highway 11 bridge. There can be a delay in opening if a train is on the way.
I have been in & out of the Pass Christian marina a few years ago on a Beneteau 373 that had a 5 foot draft with no problem. I have personally seen dredging taking place in the channel leading into the existing harbor about two years ago. There are actualy two approaches, one from the East & one from the West with shallow water inbetween the channels. Just for your information, there is a major expansion of the PC marina that is taking place to the East of the present marina. I believe that there will be about 50 recreational slips and about 100 commercial spaces at the new expansion. The new phase is scheduled to open sometime in the early fall. Meanwhile, Bay St Louis is opening their new Marina in a few weeks with the grand opening slated for July 25. It will be all recreational with about 160 slips. Between Gulfport, Pass Christian, and Bay St Louis there will a lot of space availability in top condition marinas. If you need more information about Pass Christain slip availability, water depths, and approaches, you can contact the harbor master (Willie Davis) at 228-452-5128.