I think the road that Zip is talking about can be seen on this map snippet:
I've drawn a green line along the road Zip is referring to. I've also circled Wathier and Stills Landings. The road, and it more or less can be discerned as a road, albeit overgrown, continues to the wash NE of Catclaw Flat. The road peters out a bit here down to a somewhat overgrown trail, takes a hard right, and traverses into the wash. I've circled the spot where the road hits the bottom of the wash. The road decays from this point on down but is still more or less followable. There's a trail shown leading more or less due south. I haven't been able to find this trail, but the terrain is more or less traversable. One has to detour around brush and such.
It's really interesting country over there (to me), but it's nothing like the woodsy greenery of the SGW proper. No trees to speak of or anything like that.
I've seen photos of waterfalls coming out of the SGW into the Whitewater River, but those are only going to be scenic on wet years in the spring.
HJ