White Knob Mountains Access is covered on pages 264 and 265 in the book. Access often changes. Ray Brooks provided the following additional updates which should be noted before your trip:
There is now a legal new road up Alder Gulch that stays above the ranches in the creek bottom. Although I think the Mammoth Canyon Road above Stewart Canyon is in fine condition for high-clearance 4WD vehicles, it is as of 2015, only open to ATV’s, etc, above the mouth of Stewart Canyon.
I think the “Mine Hill Road” to Cliff Creek from Mackay, then the hilly & narrow road into Mammoth Canyon, is a better choice than Alder Creek, except on busy weekends, or after heavy rain. The evening I drove in there in early July, it had rained heavily & I put my SUV in 4WD for the sloppy uphill from Mackay to Cliff Creek. When I got to where the one lane, with pullouts road started down into Cliff Creek, I could see that an ATV had recently left 2″ deep furrows coming up the road. In a moment of wisdom, I put my SUV into Low-Range & started down that hill in my lowest gear at 2 mph. I basicly “skied” my vehicle down about two hundred yards of wet clay surface with a ditch on my right & enternity on my left. After that scary stretch, the road was just wet & sloppy. I car-camped before the big downhill into Mammoth Canyon & toasted cheating death on wet clay roads. NOTE! The first hilly part of the Naverre Cr. road has some clay surface too.