This NM was implemented in February 2019. From a map, it appears that the HP would be along the southeast side roadway. Several spots poke through the 2,040' contour; this one seems to go highest. A visitor would want to simply travel that roadway and touch all high ground.
Notes from a vistor: "The boundary is 50 feet from the center line of the road. The land drops precipitously away from the edge of the road. I found that the road high point was near 34.55230/-118.49786. So 50 feet from the road centerline would be well below road elevation. In only two locations did I find that the shoulder was wide enough to allow for that 50 feet The southern one is at 34.55144/-118.49919 and the northern one is at 34.55309/-118.49442. It seems likely to me that the monument high point would have to be at one of these two spots. The southern one, though slightly higher may not be 50 feet wide. I estimated it at around 40 feet to the berm. The northern one is very much larger, and though lower at road level, there would be no drop off at all."