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This Austin trail is a 7 mile lolly pop loop loop. The access point we used was 360 access. To start you head west of left on the main trail from 360 access. You never have to cross Barton Creek and run up the west side of the trail under 360 bridge and then under the Mopac bridge. This part of the trail is all fairly flat. You will take a sharp left hand turn at 2 miles out from 360 access which is just at the 5.5 mile marker of the trail. This begins the "Rattlesnake" portion.
You gain about 125 ft over the next 1/3 mile. This part of the trail can be tricky with a few turn offs. The trail is very rocky and when the leaves cover the trail is can be difficult to find the path. You take a right hand turn at 2.66 miles. You will be up in a field and the turn off can be hard to see. From here on out you take all the right hand turns possible.
There is a sneaky turn at 3.66 as well, so keep your eyes open. Then at 4.35 mile you take a right hand turn at the T intersection and that drops you down into a creek bed (picture to left). Take the creek bed down about 50 meters down and it will connect you to the main trail. If you head left the trail dead ends in about 100 meters at the "Back Door Spring". It is drinkable spring water! To head back to the trailhead you take a right from the creek bed and head back to the 360 access.