The area immediately adjacent to Glenn Ranch Road is being developed so branching trails may be closed. More info available here.
Whiting South Spur (aka Edison Viejo) is a short spur trail that's dominated by giant power lines. The trail has some gravel and a few small rocks near its intersection with Aliso Creek. It has several intersections with other trails, some dead-ends or no-names, so know your map. The area immediately adjacent to it is being developed so some branching trails may be closed.