Not just a lock, but there's a bridge to worry about; passing under it
at low tide is your height limit.
i would imagine the problem would be at high, not low, tide.
oops. mea culpa.
Not at all. On a trip between oceans, waiting less than 12 hours for
a favorable tide is probably negligible. And outside the locks, any
ship that fit through the locks will not block other traffic that
also fits through the locks.
(But I sure am glad I didn't send an answer to the "What is
Unused Dairy Product Helper" question.)