I work on the columbia with those a hole ships and tugs and yes stay out of there way even if they know there is a popular hogline they can avoid from miles away they will still want you to move (ego)
but don't tie off to a piling (or dolphin) you will possibly get fined.
I have had fairly good luck inside the mouth of the cow. or right on the inside channel lip pullin plugs good luck and let us know how you do !