Forest Service Road 128 is a hiking, biking, and horse trail in Coconino County, Arizona. It is within Coconino National Forest. It is 11.6 miles long and begins at 6,299 feet altitude. Traveling the entire trail is 23.3 miles with a total elevation gain of 1,436 feet. The Onyx Tank (elevation 6,490 feet) reservoir can be seen along the trail.
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