Canyons are inherently risky. Flash floods occur without notice on sunny days. Technical skills & surrounding topography knowledge required yet does not eliminate risk.
An adventurous crack fault canyon with 8-10 rappels up to 180ft that's great to do when you're in the area and want to stay mostly dry or avoid the monsoons by doing a canyon without much flash flood potential. From the car park, head north down into the canyon. When you're thru the technical section, you can either head down Sterling Canyon to another vehicle left along 89A or head up Sterling Canyon to loop back along 535A to your vehicle.
Check out the Official Route and Triplogs.
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.