F South 821 Road is a hiking, biking, and horse trail in Gila County, Arizona. It is within Tonto National Forest. It is 2.4 miles long and begins at 5,535 feet altitude. Traveling the entire trail is 4.8 miles with a total elevation gain of 303 feet. The Mud Tank (elevation 5,640 feet) reservoir can be seen along the trail.
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