Barley Flats Truck Trail is a hiking trail in Los Angeles County, California. It is within Angeles National Forest and San Gabriel Mountains National Monument. It is 3.2 miles long and begins at 4,613 feet altitude. Traveling the entire trail is 5.7 miles with a total elevation gain of 2,210 feet. The Caltrans Mt. Wilson industrial and the Red Box ranger station are near the trailhead. There are also parkings, a picnic site, and restrooms. The Firebreak cutline can be seen along the trail. There is also a reservoir covered along the trail. The trail ends near the Firebreak cutline.
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