Forest Service Road 3n16 is a hiking, biking, and horse trail in Los Angeles County, California. It is within San Gabriel Mountains National Monument. It is 2.5 miles long and begins at 5,369 feet altitude. Traveling the entire trail is 5.1 miles with a total elevation gain of 1,065 feet. Near the trailhead there is parking. The Charlton Flats Picnic Area picnic site can be seen along the trail.
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