Lets "Lock thru" ..been thru a lock and dam lately??

Waiting your turn can be time consuming as pleasure crafts are not first on the list.  When the horn blows and you get the green light you carefully pull in.  Then tie up to a "floating bollard" on the wall of the lock.  Then the lockmaster closes the big doors and fills the chamber to the top if your going up strean.  (or if going down stream he lets the water drop to the level of the river below the dam)  Then the big doors open and you leave carefully. But not until he blows  the horn that is so loud that it scares you even though you know its comming.  The "first mate"  JoAnn's job is to make sure the boat is tied to the bolard while the captian's job is to get the boat close to the dirty slimy wall.