For pictures and description of this trail, see http://dyeclan.com/outdooractivities/hiking/cassidyarch.
I also have lots of other fun outdoor activities in and around Utah on my website: http://dyeclan.com/outdooractivities.
These include canoeing, canyoneering, caving, hiking, hot springs, rock
climbing, and fun places. The site's a work in progress, so check back