This is the main section of hiking on the buried Los Angeles aqueduct, starting after crossing the open California aqueduct. In the beginning you can either hike by balancing on the rusty round pipe with rivets sticking about two feet high out of the soil, or walk on the parallel dusty dirt road next to it. After a few miles it turns east and is encased in concrete rather than steel, with a flat concrete top that is easier to walk on than balancing on the round pipe.
After this there are still another 4 miles or so where the LA aqueduct sometime resurfaces under the trail, until the crossing of Cottonwood creek, where the PCT leaves the aqueduct and climbs the next ridge on the other side of this wide desert bottom.