Mount Saint Helens National Volcanic Monument surrounds the infamous Washington State volcano which last erupted in 1980. Volcano watching is the most popular activity at the park, and can be done by climbing the volcano, hiking the nearby trails, or taking a helicopter tour. A limit of 100 guests per day may climb the volcano, and permits are required. The Johnston Ridge Observatory is managed by the US Forest Service and is located in the heart of the explosion zone. It offers exhibits and films on the history of the mountain and its eruptions. The nearby Forest Learning Center is primarily a gift shop, but also offers visitor information.

3029 Spirit Lake Hwy, Castle Rock, WA 98611, Phone: 360-449-7800

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