From HWY 89 take FS 104 2.2 miles to 104B junction. Take 104B to 0.1 miles before the fire lookout.
Trailhead is on left.
It is a very good idea to leave a truck parked at the Cottonwood Humane shelter for transporting bikes back to the top. It's very steep, rocky and has tight 180 switchbacks. Take a right at the stop sign at the top, and another right when you see the Gaddes Canyon trail sign. Get on Gaddes Canyon. END at the Cottonwood Humane Shelter.