The fire department and logging companies are currently deforesting the trail head area. Because of this the dirt portion of the road(1/4 mile) has been badly torn up and would not be easily passable to a low clearance vehicle. Also of note, the fire department plans on executing a control burn in the area in 2007.
Phone number for Mill Creek Ranger Station has changed... It's now (909) 382-2882
The adventure pass link is broken... You might want to use this one instead
...no longer required at this trailhead. (South Fork, Momyer, and Vivian are the only three SG Trailheads that still require it)