High water has caused no end of trouble for the Port of Morgan City over the last couple of years. It turns out low water can be a problem, too. The port’s board heard Monday that over the next three weeks, the Atchafalaya River at Morgan City, now at the 7.0-foot moderate flood stage, is expected to fall. This could be a problem for navigation on area waterways as the low water exposes shoals. A Coast Guard report Monday said that branch has dealt with eight vessel groundings in the last seek alone. That doesn’t mean high water won’t continue to cause problems,