I just came back from Canyonlands and I could still see the MW with my aged but bare eyes! I was surprised, of course it's not with the GC but yes, you can. The light pollution is minimal and there are plenty of foreground objects to use in nearby Arches. I did not do any astro photography on this trip as it was very cold at night, only had one semi, cloud-free night and I was mainly there to visit my daughter.