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Fs 405 is a hiking, biking, and horse trail in Broadwater County, Montana. It is within Helena National Forest. It is 8.4 miles long and begins at 5,236 feet altitude. Traveling the entire trail is 16.9 miles with a total elevation gain of 3,735 feet. The Mamouth Mine (elevation 6,030 feet) quarry can be seen along the trail.
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