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The Most Dangerous Volcanoes in the U.S. The most dangerous volcanoes in the U.S. are all composite volcanoes along the American Ring of Fire on the U.S. West Coast and Alaska, except for the two shield volcanoes on the Big Island of Hawaii. Mauna Loa and Kilauea are ranked #8 and #1 respectively.
Although the May 18, 1980, eruption and resulting landslide destroyed much of the volcano's summit area, Mount St. Helens still stands 8,364 feet (2,549 meters) above sea level.hirty years after Mount St. Helens blew its top, the peak is still the second most dangerous volcano in the United States, according to government estimates. (Pictures: America's Ten Most Dangerous Volcanoes.).