Navajo Bridge was the only bridge across Marble Canyon (south of Page, Arizona) for many years. Now it is a footbridge, and a favorite roosting spot for newly released condors.
We heard about the condors at the Grand Canyon and sought out the bridge to see if we could spot condors. There was a juvenile sitting on the struts under the bridge, and while we were there, an adult condor soared above us. We think it was A6, but it was very difficult to see the tag.
The Colorado is deep green because the dams hold the silt which normally would be carried downstream. They have instituted a practice of releasing water periodically from Glen Canyon Dam, which partially restores the fertility of the lower canyon, and prevents silt from extreme buildup behind the dam.