I had a lot of time to look around while I was at Rainbow Canyon.  As the day wore on and the sun came around, I started to have a clearer view to the south.  In the morning, it had been quite foggy in that direction but that was burning off and I could see the above view.  It looked a bit like there was a runway out there but it was so far away, I couldn’t be sure.  When I got home, I looked on Google Maps.  Sure enough, there are some long stretches of what looks like concrete but no indication of what there are.  Do any of you know?  The place is called Millspaugh if you want to look it up.