I have been up there with a group. If you look carefully on google maps you can see the trail.
Take the first drainage on the left after the canyon opens up.
You will come to a pour off. There is a good trail to the left(North) that I missed on the way up because I was so focused on trying figure out how to get up the pour off.
Follow the trail up the North side of the drainage until you reach the saddle. Then head up hill to the right. The trail follows creek bed and such but if you head up hill south away from the river you will come to a loop trial. Head right and you will get back to the lip of rattlesnake canyon and will run into the majority of the arches.
On the map on the second page. The river is about a mile north up rattlesnake canyon. The saddle is pretty much where the map says "5226". You hit the trail west of where it says "2miles".
It took a group of high school kids about 4 hours round trip.
The view is great.