Mount Rainier
Because it has a high risk of erupting in the future and is close to a high population, Mount Rainier is considered one of the most dangerous volcanoes in the world and is listed as a Decade Volcano by the International Association of Volcanology and Chemistry of the Earth's Interior. It hosts a large amount of glacial ice which could produce massive lahars (volcanic mudflows) that threaten the entire Puyallup River valley. According to the United States Geological Survey, "about 80,000 people and their homes are at risk in Mount Rainier's lahar-hazard zones."