Forest Service Road 91 is a hiking, biking, and horse trail in Coconino County, Arizona. It is within Coconino National Forest. It is 3.7 miles long and begins at 7,339 feet altitude. Traveling the entire trail is 7.4 miles with a total elevation gain of 274 feet. The Mulholland Tank (elevation 7,385 feet) reservoir can be seen along the trail.
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