Started from the Vultee Arch trailhead shortly before 6am to beat the holiday rush and the forecast high approaching 100 degrees. I wish I had found this loop a long time ago! You get a little bit of everything on this hike: wide open red rock views on the Secret Canyon side, and a cool forest walk on the Bear Sign side. Did not see a single person on the hike, just the way I like it.
Secret Canyon trail is in great shape and very easy to follow. The southern turnoff for HS Canyon is signed, but the trail looked faint at best. I completely missed the northern HS canyon junction and have no idea if it's actually there; just like everyone else it looks like. David Miller west of the pass is a little brushy and faint in areas, east of the pass it's better and looks like there's been some very recent trail maintenance. Bear Sign and Dry Creek are in good condition as well.
It was nice to be back in this area: the Vultee Arch trail was the first "real" trail I hiked in Arizona nearly 20 years ago, and probably what spurred my love of hiking. Then the road turned into what it is today, and there's no way my old 1996 Saturn could make it down here now. High clearance is definitely required, preferably with a short wheelbase. 2WD could probably be done with careful driving and a dry road, but I was definitely a lot more comfortable with 4WD low.