Hwy 191 and follow signs to Arches National Park and then to Delicate Arch. It is then about a 2 mile hike up to the arch.
I was at Arches for an Astrophotography Workshop with Brad Goldpaint, who is a fantastic instructor, bye the way. Unfortunately, it rained every night we were there. This is the best image I got prior to getting dumped on by a torrential downpour. I was pleased to capture some distant lightning and the remaining stars along with a rare iridium flare which is a reflection off a satellite.