(I know it may seem that I'm obsessed with Blogtown, but don't worry, I'll soon get bored with it and fling it away like a used kleenex, just as I did with Wonkette.)
You don't need to enter a contest to see how the Morrison bridge works. You can pay $10 and take a walking tour as part of Bridge Fest. Half of the group got to lie down on the bridge's roadway when it closed to traffic, the other half were underneath as it opened up.