Here is an other "guess where it is" picture. Hint: I took this picture in a lock on our Upper Mississippi River cruise on the MQ in 2006. Guess from which lock the lock master is a Green Bay Packers fan
The correct answer, given by Capt. Randy Kirschbaum, is: it's Lock and Dam No. 14, the Green Bay Packers bench is located at the upper end of the guide wall there.