Big Obsidian Flow Trail is a hiking trail in Deschutes County, Oregon. It is within Newberry National Volcanic Monument. It is 0.5 miles long and begins at 6,388 feet altitude. Traveling the entire trail is 0.7 miles with a total elevation gain of 308 feet. The Big Obsidian Flow Trailhead parking is near the trailhead. There are also restrooms and an amphitheater.
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