OK I thought this was interesting so I want to share. U probably will think this sux but I'm sharing anyways.
Look at the below photo (it's from 5 years when they were still building the Hoover Dam bypass bridge but that's not relevant):
See the crane thing circled in yellow? I thought that whole contraption was just a non-functioning relic leftover from when they built the dam in the 1930s, but nahhhh...it still works! Saw it with my own eyes today - they moved it around for a bit for maintenance (would have taken a pic if I had a camera w/me). The little booth circled in red is where the controls are. The more you know...