About 450 years ago, there was
an eruption on Mount St. Helens. A mudflow (lahar) emptied into
the lower entrance of Ape Cave. It plugged the bottom of the cave.
About 450 years ago, there was
an eruption on Mount St. Helens. A mudflow (lahar) emptied into
the lower entrance of Ape Cave. It plugged the bottom of the cave.
Over time, water dripped on this
sandy floor and washed some of the sand away. This left a fairyland of
"sand castles."
Unfortunately, people have
walked on most of these sand castles and knocked them down. So, protect
the few that remain. Watch where you step!
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Mount St. Helens & Other
Volcanoes
Special Features
Ape Cave
Before the Eruption
Mount St. Helens
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