Took me awhile to locate the trailhead for this one. The location given in the full hike description is accurate, but the description in the brief summary is out of date (and unfortunately, I only had the brief summary with me). It says "Shortly past the ADOT yard, highway 288 (now dirt) will make a 180 degree turn to the left (there is a small green sign that says Parker Creek). Just past this sharp turn, the highway will curve right. As soon as you enter the right curve, there will be a short road (I think it is marked with a trailhead sign) taking off uphill to your right. The parking area is just a couple hundred feet down this road."
In reality, 288 is paved now, and the trailhead is before the 180 degree left turn, not after. If you go past the 180 turn and take a right, you'll end up at the gated off driveway to the now-closed Sierra Ancha Experiment Station Office. Turn around and go back in the other direction. There's a trailhead sign marking the turnoff, but it's hard to see until you're almost on top of it, and I totally missed it until I came from the opposite direction. The trailhead is on the east side of the road, not more than 40-50 feet off the highway.
Anyway, this was a really nice hike, at least the bit that I did. I was really looking for some fall colors, but was about a week late. Still had a good time, and turned around after going a mile or so. I dropped down into the dry creekbed for the return hike and that slowed me down quite a bit. Ran into a couple of bowhunters who had seen nothing, but did assure me that the views from further up the trail were incredible. I'll have to go back next time I'm in state and do it again.