I noticed too.
I went fishing with a Lockmaster a few years ago and did the same. We got our own minnows from a local creek and caught about 2 dozen sauger each. Other fisherman around us were using store bought minnows and couldn't catch one.
Later, we headed up river thru the Lock and the lockmaster on duty told my friend to let himself though because he was on his lunch break. So he shimmied up the wall and told me to hold on tight to the rope.
Exciting time to go thru the lock by myself for the first time. Thousand of gallons lifting me up, up , up!