Canyons are inherently risky. Flash floods occur without notice on sunny days. Technical skills & surrounding topography knowledge required yet does not eliminate risk.
Overview: This is a scenic off trail hike up rugged Ash Spring Canyon, which is a side drainage of the San Francisco River, near Clifton, AZ. A good destination is the 100 foot seasonal waterfall about 1 mile in, where Ash Spring Canyon spills over an overhanging limestone cliff, in the main fork of the canyon. There are several other side canyons off of Ash Spring Canyon that might be worth exploring.
NOTE: old signs at the entrance to Ash Spring Canyon warn of the old quarry operation above saying "DANGER-NO ENTRY: BLASTING AND DUMPING OF ROCK AND OTHER DEBRIS FROM CLIFF ABOVE-KEEP OUT", but the quarry appears to have been abandoned many years ago. There are not any "no trespassing" signs.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.