I just heard that Nightmare Gulch is going to be closed. I really hope this isn't true but I thought I would pass this on. Here is an email received:
The closure of Nightmare Gulch to vehicles is a permanent closure. It is still open to hiking and equestrian use. The reasons for the closure are cited as protection of sensitive biological and geological resources as well as public safety due to the deterioration of the vehicle route due to a recent flash flood.
We are sorry for the inconvenience but it just cannot be helped.
Mojave Sector Office