I was heading back to Bastrop from Austin today and as i crossed over Onion Creek (i think its Onion Creek) i noticed they were installing concrete sidewalk/trail along the creek there.
Its on 71 East of 973 and 130. It goes right under the bridge. I wasn't able to stop and check it out, but I am curious if it is part of the trail system you guys are discussing in this thread. I need to get my bike and gopro and check it out. Just wish i didnt have work to worry about this week, ;)
Here is a map showing the general location (purple pin)
http://img.tapatalk.com/d/13/06/03/a4a3e6a2.jpg