description Ape Cave Overview
Ape Cave is a remarkably long lava tube situated within the Mount St. Helens National Volcanic Monument of Washington State. Formed by flowing lava during volcanic activity near St. Helens, it stretches over 2.5 miles and offers a unique glimpse into subterranean geological processes.
The cave’s significant length makes it notable for exploration and study, particularly appealing to experienced cavers and geology enthusiasts interested in examining lava tube formations.
help Ape Cave FAQ
Did the 1980 Mount St. Helens eruption create Ape Cave?
No. Ape Cave formed from a basaltic lava flow roughly 1,900 years ago, long before the explosive 1980 eruption.
What is the difference between the Upper and Lower Ape Cave routes?
The Lower Cave is the easier out-and-back option, with a comparatively level floor. The Upper Cave is longer and more strenuous, requiring visitors to cross rock piles and climb a lava fall before exiting through a skylight.
How long is the complete Ape Cave lava tube?
The mapped tube extends for more than 2 miles beneath the Mount St. Helens area. The main entrance divides the visitor experience into the shorter Lower Cave and the more demanding Upper Cave.
What equipment is essential inside Ape Cave?
Every visitor needs reliable light sources, and the U.S. Forest Service recommends carrying backups because the cave has no installed lighting. Sturdy footwear and warm clothing are also important since the interior is cold, dark, and uneven even during summer.
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