Forest Road 139 is a hiking, biking, and horse trail in Garfield County, Utah. It is within Dixie National Forest. It is 6.7 miles long and begins at 9,136 feet altitude. Traveling the entire trail is 13.3 miles with a total elevation gain of 798 feet. The Big Swale Reservoir Number 2 (elevation 9,465 feet) reservoir is near the trailhead. The Big Swale Reservoir Number 1 (elevation 9,469 feet) and Lost Spring Reservoir (elevation 9,203 feet) reservoirs can be seen along the trail.
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