![]() This was the height when new in 1918, but loss of the terra cotta that covered the top course of bricks since then reduced its height one or more inches. ![]() The overall height of the stack is 585 feet 1 + 1⁄ 2 inches (178.35 m) (≈ 585 feet), including a brick chimney 555 feet 1 + 1⁄ 2 inches (169.20 m) (≈ 555 feet) tall and the downhill side of a concrete foundation 30 feet (9.1 m) high. The stack and its viewing area are now the two-part Anaconda Smoke Stack State Park. The inside diameter at the bottom of the brick chimney is 76 feet (23.2 m) while that at the top is about 60 feet (18.3 m). A terra cotta coating covered the entire brick chimney when new, but by the time the smelter closed in 1981, most had eroded away except for the upper 40%, exposing most of its bricks and reinforcing rods. It is a brick smoke stack or chimney, built in 1918 as part of the Washoe Smelter of the Anaconda Copper Mining Company (ACM) at Anaconda, Montana, in the United States. The Anaconda Smelter Stack is the tallest surviving masonry structure in the world, with an overall height of about 585 feet (178.3 m), including a brick chimney 555 feet (169.2 m) tall and the downhill side of a concrete foundation 30 feet (9.1 m) tall.
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