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Visit Johnston Ridge Observatory, Castle Rock, Washington
The Johnston Ridge Observatory is located 52 miles (84 km) east of Castle Rock, Washington, at the end of Washington State Route 504, four miles from the mountain. Exhibits focus on the geologic history of the volcano, eyewitness accounts of the explosion, and the science of monitoring volcanic activity. Two movies and ranger-led programs are available every hour. A half-mile paved trail provides views of the lava dome, crater, pumice plain, and landslide deposit, with access to hiking trails in the restricted area.
The observatory is located near the site of volcanologist David A. Johnston's camp on the morning of May 18, 1980, and opened in 1993.
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