We sent one of our correspondents out from the Austin Bike World Headquarters to scope out the Reimer's Ranch flow trail so that you could see improvements to the park. The county has done a nice job of adding trails and facilities for bikers. It's worth the trip. Thanks to Jonathan Nolte for the pictures and video of the trail.
The flow trail is accessible from the trail head, the entrance is just to the right of the main trailhead parking lot.