National Forest Development Road 420 is a hiking, biking, and horse trail in Nye County, Nevada. It is within Humboldt-Toiyabe National Forest. It is 5.2 miles long and begins at 5,454 feet altitude. Traveling the entire trail is 10.5 miles with a total elevation gain of 3,315 feet. The Troy Post Office (historical) (elevation 6,217 feet) post office and the Old English Mine (elevation 7,457 feet) quarry can be seen along the trail.
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