Forest Service Route 3n39 is a hiking, biking, and horse trail in Los Angeles County, California. It is within San Gabriel Mountains National Monument. It is 5.2 miles long and begins at 8,066 feet altitude. Traveling the entire trail is 2.4 miles with a total elevation gain of 799 feet. The Native Son Mine (elevation 5,705 feet) quarry can be seen along the trail. The trail ends near the Cabin Flat camp site.
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