National Forest Development Road 438 is a hiking, biking, and horse trail in White Pine County, Nevada. It is within Humboldt-Toiyabe National Forest. It is 6.9 miles long and begins at 7,474 feet altitude. Traveling the entire trail is 13.8 miles with a total elevation gain of 2,367 feet. The McDonough Pits Mine (elevation 7,087 feet) quarry can be seen along the trail.