I head up "the shortcut" to check out a better road that I saw on my way here, but which is not on my maps

I dismount the bike to walk through the sand at the start of the shortcut road.

I'm a bit confused because Wilderness barriers here block an intersecting wash not indicated on my maps as being within a Wilderness area. However, I will learn later from a ranger at Kelso Depot that the Wilderness boundaries have changed since publication of my maps.