description Boulder Cave Overview
Boulder Cave is a distinct lava tube located in Washington's Cascade Mountains, notable for the stream that flows directly through its rocky, subterranean interior.
help Boulder Cave FAQ
What makes Boulder Cave different from other Washington lava tubes?
Boulder Cave is notable for a stream that flows directly through its rocky underground interior. That combination of a lava tube and active watercourse makes it different from a dry, simple tunnel.
Where is Boulder Cave?
Boulder Cave is located in Washington’s Cascade Mountains. It is a distinct lava tube within a volcanic mountain landscape.
Do I need waterproof footwear for Boulder Cave?
Water-resistant footwear is sensible because a stream runs through the cave. Visitors should also expect wet, uneven rock rather than a dry, paved cave floor.
How did Boulder Cave form?
Like other lava tubes, it formed when the outer part of a lava flow cooled and hardened while molten lava continued moving beneath it. The stream now occupying the interior adds a later water-shaped feature to the volcanic passage.
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