Fs 509.1 is a hiking, biking, and horse trail in Boulder County, Colorado. It is within Roosevelt National Forest. It is 1.5 miles long and begins at 7,194 feet altitude. Traveling the entire trail is three miles with a total elevation gain of 1,194 feet. The Celestial Mine (elevation 7,175 feet) quarry is near the trailhead. The Grey Eagle Mine (elevation 8,255 feet), Little Alice Mine (elevation 7,516 feet), and Carl Gardner Mine (elevation 8,159 feet) quarries can be seen along the trail.
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