Plan on a 30 minute hump up loose talus and dirt with occasional bushwhacking through scrub oak. Park in a pullout on the north side of the road across from the brown sign that says there is no camping less than a mile from the road. You should be able to see the Margin for Air Wall throughout the approach, which helps to keep your bearings. A small trail heads to the West from the turnout. Turn off the trail once you reach the slope filled with rounded river rock. You'll arrive at a small grove of junipers, and the loose talus starts here. Eventually, you'll find what's left of the old aqueduct. From here, the talus slope gets steeper, looser, and dirtier. A short bushwhack through the scrub oak to the West leads to a talus slope with an easier grade. Once you get up past the small ridge to the East, traverse to the East and hike down around the scrub oak, and then head up the gully to the base of the Margin for Air Wall.