• Speleothems in Miller's Chapel.

    Oregon Caves

    National Monument Oregon

There are park alerts in effect.
hide Alerts »
  • 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.

Geology

Geology can be a complex and confusing subject, even for trained geologists. As with many sciences, geology has a lot of befuddling lingo and jargon, but without some sort of guide with which to describe what we observe, interpretation is impossible. We hope you can use our website as a guide to learn more about Oregon Caves before or after you visit. Lets discover some of the "unusual scientific interest and importance" of the Oregon Caves.

Did You Know?

Old growth trees at Oregon Caves National Monument

Fire suppression on the Monument for the past century changed the environment of Oregon Caves. It reduced the amount and altered the chemistry of the water entering the cave.