Oops, 3rd and 4th pic should be 4th and 5th.
I've been to Sedona many times, not Lake Powell and of course, been to Grand Canyon twice (and will be 3rd time next May). Pass the sand dunes on our way to San Diego. The I-8 (interstate freeway/highway) pass through those dunes. It will be dangerous on windy days because the sand just like snow in a snow storm, severely lowered the visibility.
I understand... We don't have those sand-storm problems here in Quebec