We crossed the Colorado River into Arizona along the top of this Art Deco monument to American ingenuity.
The dam was completed in 1938 to generate electricity and supply fresh water to Los Angeles via an aqueduct that crosses California's eastern deserts.
Clinging to the edge of the river are tiny communities, like this one, bursting this time of year with snowbirds.
This vast cottonwood-willow marsh looks out of place just north of the dam in the Bill Williams National Wildlife Refuge. (Click on the pic to make it bigger.)