Iron Mountain is a 6,286-foot summit in Mount Rainier National Park, Washington, in the Cascade Range near Success Cleaver and overlooking Indian Henry's Hunting Ground. Its summit offers views of Mount Rainier, Mount Adams, Mount St. Helens, Mount Wow, and the Tatoosh Range, while its runoff feeds creeks within the Nisqually River system. The mountain's name grew from late-19th-century mining hopes on Mount Rainier's slopes, when its dark reddish rock was thought to be iron or iron oxide amid searches for copper, silver, and gold. The United States Board on Geographic Names officially adopted the name in 1932.