St. Louis Riverfront just below the Gateway ArchSt. Louis, MO
Phone: 877-982-1410
Website
The machine is on the platform that you walk on to when taking a riverboat tour. The riverboat is parked in the Mississippi River just east of the Gateway arch. (You have to buy tickets before you're allowed on the boat.)
Continues to work fine as of 10/9/2009... only open certain hours.