I came across this video showing some good footage of the Glen Canyon Dam construction as well as some great shots of early Page Arizona. Some of the narration gets a little cheesy but the footage is amazing. You may even recognize some of the faces. I was surprised to see Chet Huntley narrating it. After the first minute and half to two minutes in, it picks up and gets good. The total length is only 27 minutes.
The five videos below are documentaries by Gary Ladd on the construction of Glen Canyon Dam. They look like they were done in a lecture format at NAU. There are some really good shots in these. When you watch them on YouTube, one video goes right into the next. I’m not sure if that will happen here too, so I’m putting all 5 of them below for you.