This dam, dedicated 100 years ago by former president Theodore Roosevelt, has created one of the largest artificial lakes in the world. It is responsible for much of Arizona’s water. I photograph it here from behind, so as to take advantage of a diagonal contrail in the sky. The contrail leads the eye from the burst of sun flare that I include at the top edge of the frame, down to the point where the dam meets the mountains on either side. The white flare and the white contrail echo the white highlights that glisten on Roosevelt Lake in the foreground. The contrail also fills what would otherwise be dead space in the cloudless sky overhead.