Roughly 1,900 years ago when Mount St. Helen’s erupted, it formed two lava tubes which parallel to the ground above. Nestled below miles of hiking trails in Gifford Pinchot National Forest, guided tours are offered in the summer or you can explore all year round with the help of a strong torch and a park pass.
The two tubes are at different heights with lower of the to being the easier path to hike, this also has what has become known as the meatball. A lava boulder that got wedged between two ledges when lava flows drained from the tube.
The upper tube is a bit more difficult. You will have to get your hands dirty and tackle boulders to complete a 3 miles hike.
T Caves were discovered and explored in the 1950’s by an outdoors club know as the Mount St Helen’s Apes. Hence the cave name, Ape Cave. It provides a good family day out as the trail is a good one for kids to do to.