Fs 509.3D is a hiking, biking, and horse trail in Boulder County, Colorado. It is within Roosevelt National Forest. It is 0.8 miles long and begins at 8,309 feet altitude. Traveling the entire trail is 1.6 miles with a total elevation gain of 594 feet. The Tippecanoe Mine (elevation 8,353 feet) quarry can be seen along the trail. The trail ends near Nugget Hill (elevation 8,560 feet).
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