This arch is really two hoodoos that are next to one another.
Hoodoos are formed when arches break in places where the rock is fragile like in Bryce Canyon National Park. Thus they were probably both arches at one time. (And they will both likely eventually be standing straighter with nothing going horizontally.)
This shot was captured during “the World’s Best 3-Mile Hike” of which you can see more next Monday for My World Tuesday.
To see LOTS more terrific sky pictures or to find out how to participate in this meme, head to the SkyWatch blog.