||See the directions to Reimers (another climbing section under South Central Texas). Follow signs to "North Bank". Park at the cul-de-sac. Hike right of the cul-de-sac, down dry-stacked stone stairs, work down hill and look for the first good crossing of the (usually dry) creek. For The Dude Wall, don't cross. Continue on the left side of the creek and soon cut left up hill to a cool tall boulder. Walk counter-clockwise around it and find the routes.
The Matrix is the bouldering on that tall boulder and left of it.
The rest of the routes are accessed by crossing that (usually dry) creek.
For the best beta, get the guidebook at www.AustinClimbingBook.com.