Lock and load (drink) up

We experienced our first of 60-plus locks last night and the process is slow. So while the boat is meandering through the Main now (floated off the Rhein to the Main--the rivers' names rhyme), we will be drinking and munching, and sipping and imbibing...and it's really too much. My beloved track on the deck is off limits for 5 days while we go under low bridges.  All tables and canopies--even the wheel house--have been lowered to accommodate  the low bridges.  I wonder what they do when the water's high?  Right now it's super low and we're seeing lots of beach sand  and  rock  rising from the river.