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Upper Passage (Cave) is a hiking trail in Skamania County, Washington. It is within Mount Saint Helens National Volcanic Monument. It is 1.4 miles long and begins at 2,083 feet altitude. Traveling the entire trail is 2.6 miles with a total elevation gain of 452 feet. The Skylight and Lava Fall viewpoints can be seen along the trail. The trail ends near the Ape Cave Upper Entrance cave entrance.
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