• Speleothems in Miller's Chapel.

    Oregon Caves

    National Monument Oregon

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  • Cave Tours Closed for Season

    Cave Tours are closed for the winter. Tours will resume April 26, 2014. All trails on the monument remain open.

  • Road Work

    Crews are removing brush along highway 46 beginning in the lower parking lot and moving down the highway. Work is scheduled to last until April 20, 2014; expect delays.

Natural Features & Ecosystems

At Oregon Caves National Monument, we observe unique ecosystems above ground in an old-growth forest and below ground in a cave system. These ecosystems blur in what is known as "twilight zones" of caves--the region of the cave where there is an opening to the forest, where light can penetrate the room. We find photosynthetic plants such as mosses in this area. Furthermore, some animals who inhabit cave environment depend on the forest outside for food. As a result, animals such as bats and wood rats are often found inside twilight zones. There exists a deep connection between a forest and a cave as both environments are linked through biology, chemistry, and hydrology.

Did You Know?

This snail was named after an employee of Oregon Cave, not because he was slow but because he wrote the technical description of the snail.

There is a snail that lives on the marble rock outcrops of Oregon Caves that has adapted to use the calcium from the rock to make its shell.