Introduction: What? : The hike to Cassidy Arch is one of the most popular trails in Capitol Reef National Park and there is a good reason for that. Relatively easily accessible from Scenic Drive (when it is open), features stunning panoramic scenery of the Grand Wash canyon and the white domes, and the impressive Cassidy Arch.   This is a moderate 3.5 miles out and back long hike with elevation gain of 630 feet, plan for about 2 hours hike.