12/06/2025
It isn't often you get to venture a mile into the earth in pitch blackness! In this video we hike in to the Lava River Cave near Bend, Oregon. It is part of the Newberry National Volcanic Monument which is managed by the U.S. Forest Service. The northwest section of the cave is the longest continuous lava tube in Oregon. While the cave's discovery in 1889 was officially credited to a pioneer hunter, the presence of obsidian flakes near the cave has led archaeologists to conclude that Native Americans knew about the cave long before settlers arrived in central Oregon.
The eruption which formed the Lava River Cave occurred about 80,000 years ago. The Lava River Cave was created by lava flowing downhill from a volcanic vent toward the Deschutes River.
The area around the Lava River Cave receives about 18 inches (46 cm) of precipitation per year. Over the centuries, water from rainfall and snow melt has seeped down through the soil and cracks in the cave roof depositing sand on the cave floor. Small rivulets of water carry the sand downhill, plugging the far end of the cave with sediment. As a result, it is unknown how far the cave actually extends beyond the sand plug at the end of the trail.
It isn't often you get to venture a mile into the earth in pitch blackness! The Lava River Cave near Bend, Oregon, is part of the Newberry National Volcanic ...