To get to the trailhead drive to the park headquarters of Dinosaur N.M., which is a few miles east of the town of Dinosaur, CO (Dinosaur is located on Highway 40 just east of the Utah border). Drive north on the Harpers Corner Road for 6.9 miles and park on a little side track on the left. This canyon is in a WSA and the BLM request that you park just inside the gate.
First, you must drive to the town of Dinosaur, which is located on Highway 40 just east of the UT-CO border. From Dinosaur, drive east a short distance to the Visitor Center for Dinosaur National Monument. From the visitor center, drive north on the Harpers Corner Road to the Plug Hat Picnic Area, which is located 4.2 miles from the visitor center.
Complete the Main Fork as described here. Climb out at the exit just below the confluence of the two forks as described Grand tour of Magic Chamber: Complete the Main Fork as described here. Climb out at the exit just below the confluence of the two forks as described here and head cross country to the head of the slot in the South Fork. A prominent rock tower makes a good landmark. Descend the South Fork and return to the car via the exit route described. This is the most rewarding way to do the canyons, and visits both forks in one shot.
Several slings (bring 100 feet minimum), 10-12 rapid links or rappel rings, one 60 meter rope, one 20 meter rope, and a climbing harness. There may be short wades in the slot, but probably never any swimming, so go prepared for that. A helmet is definitely recommended.
"Starting a rappel and noticing your rope is too short isn't quite as bad as starting a bungee jump and noticing your cord is too long"