A few years ago I visited Hoover Dam with my wife and we saw the beginnings of a new bridge across the canyon. I finally got my chance to see the finished product. It is called the Mike O'Callaghan–Pat Tillman Memorial Bridge. I love the jet contrails. They were all over the sky.
E-M5 12-60mm 18mm f/9.0 1/640 ISO 200
Here is a view of the dam from the bridge (yes, it is a nice little hike).
Bridge detail and more contrails.
The Dam and the Bridge.