"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. 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.

"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. 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). The stack and its viewing area are now the two-part Anaconda Smoke Stack State Park.

"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. 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 lowest 68 feet (20.7 m) of the brick chimney is an octagon, the vertices of which point to the cardinal and intercardinal directions, north, northeast, east, etc., while its sides face the secondary-intercardinal directions, north-northeast, east-northeast, etc. Two large vertical openings are in the octagonal portion, each 12.5 by 60 feet (3.8 m × 18.3 m), on its east-southeast and south-southwest sides."  (Wikipedia)

"The old Anaconda Copper Company smelter stack, completed in 1919, is one of the tallest free-standing brick structures in the world at 585 feet," the Montana FWP says.

"The inside diameter is 75 feet at the bottom, tapering to 60 feet at the top. In comparison, the Washington Monument is 555 feet tall."

"In the mining town of Anaconda, Montana, resides a monument to construction. The Anaconda Smelter Stack. With an overall height of 585 feet, it's the biggest masonry structure in the whole world," the 96.3 The Blaze says.

Built in 1918 by the Alphons Custodis Chimney Construction Company of New York, the smelter was used to smelt ore mainly from the Berkley Pitt from the neighboring town of Butte. The stack itself is manufactured from almost 2,500,000 perforated bricks and the whole thing weighs in at around 23,000 tons. Ya, it's that big. According to Wikipedia the Washington monument would nearly fit inside.

"The stack was used by the Washoe Smelter until it's closure in 1981, but having such an amazing, and interesting history, Anaconda locals wouldn't let the stack be demolished, and I don't blame them. This thing is incredible. They quickly organized a "Save The Stack" campaign and in 1986 it was designated as it's own state park. "The Anaconda Smoke Stack Park".

"Completed in 1919, the old Anaconda Copper Company smelter stack is one of the tallest free-standing brick structures in the world at 585 feet. At the time of construction, the stack was the tallest masonry, brickwork structure, and chimney of any kind in the world, and it remains the world’s tallest surviving masonry structure," the 95.5 KMBR says.

"The Washington Monument is 555 feet tall, and 55 feet wide at its base. The Smelter Stack is 76 feet in diameter at the bottom, and it narrows to 60 feet at the top.

'It is so large that the ENTIRE Washington Monument would fit inside the Smelter stack. 60 feet doesn’t sound like much, but it is the distance from the pitcher’s mound to home plate. It Is also the length of a bowling lane. Each of the white ‘HOLLYWOOD’ letters is 49 feet tall. You could stack 11 of them vertically and still not get to the top of the Anaconda Smelter Stack. Needless to say, the stack dominates the landscape in Anaconda, Montana."

"The Anaconda Montana Smelter Smoke Stack is now a Montana state monument and is the tallest surviving masonry structure in the world. Standing 585’ tall, it was completed in 1919 and had a lightning protection system installed at the time of construction," the Kuefler Lightning Protection says.

"Without a lightning protection system installed on the smoke stack, it would have surely suffered damage from lightning strikes over the last century. There is one particular news story wrote about a large smoke stack that did not have a lightning protection system that was struck and damaged by lightning.

"This resulted to the stack being demolished using dynamite and a new smoke stack had to be replaced at a heavy cost. The Anaconda smoke stack lightning protection system is a true testament to the effectiveness of a lightning protection system."

"Tucked into the folds of the Pintler Mountains, the Anaconda Smelter Stack is not only one of the tallest surviving masonry structures in the world, it’s also one of a few remaining vestiges of the region’s storied mining history – a history that produced vast wealth for some, steady employment for many and environmental pollution still undergoing cleanup today," the University of Montana says.

"Saved from destruction by Anaconda’s citizens, the stack today is the star attraction at the aptly named Anaconda Smoke Stack State Park. It must be viewed at a distance, though, because the ground around the stack is still polluted with toxic levels of arsenic.

"According to the Montana Historical Society, at the time of its founding in 1883, Anaconda was of the state’s more ethnically diverse communities, with many of its residents born outside the United States and employed at the Anaconda copper smelter."

"During the early years of smelting in Anaconda, each of the many furnaces at the Old Works required its own stack. Later the individual stacks were connected through flues to a large central stack," the Historical Marker Database says.

"When constructed in 1902, the first Washoe Smelter stack stood 285 feet high. As the production capacity of the smelter grew, the decision was made to design and construct one enormous stack to handle the large volumes of flue gas. In May 1918, the 30-foot high octagonal base for the "Big Stack" was completed. It was comprised of 20,891 sacks of cement, 50 railroad cars of sand, and 118 railroad cars of crushed rock. The Washoe Smelter stack was a colossal construction project that was completed in an extremely short time. Construction took 142 actual working days (8-hour shifts), with an average of 12 bricklayers per shift. On May 23, 1918, the first block was set in place, and the last block was set in place a little over six months later, on November 30, 1918.

"From the 30-foot base (elevation 5,754 feet), the stack rises to 585 feet and is constructed of 2,464,652 locally-manufactured tile blocks, the equivalent of 6,672,214 ordinary bricks. Elevation at the top of the stack is 6,339 feet. An enormous amount of material went into the mortar necessary to construct the stack: 41,350 sacks of cement, 77 railroad cars of sand (50 tons per car), and 37 railroad cars of fire clay. Over 300,000 feet of lumber were used in the stack's construction. By May 5, 1919, the flue and stack were placed into operation, and the first smoke from the Washoe Smelter emerged from the stack."

"At 585 feet tall, the Anaconda Smelter Stack is the tallest surviving masonry structure in the world. From 1918 to 1981, people from miles around could see dark smoke billowing from the chimney as part of the production activities at the Anaconda Copper Mining Company in Deer Lodge County, Montana. County health officials were concerned about arsenic and lead exposures created by the smelter’s past mining activities," the U.S. Department of Health & Human Services says.

"ATSDR conducted an exposure investigation (EI) to evaluate community exposure to lead in Anaconda in the fall of 2018. They published the EI report and presented its results to the community at a public meeting in 2019.

"The EI concluded that levels of blood lead and urinary arsenic measured in residents of Anaconda were comparable to those of the U.S. population as a whole. People who reported working in jobs associated with potential lead exposure had relatively higher blood lead levels than the Anaconda EI participants. ATSDR recommended continued blood lead testing for children younger than six years in the Anaconda community."

"The Anaconda Smoke Stack dominates the valley between Butte and Deer Lodge. At 585 feet tall the Smoke Stack is one of the tallest free-standing masonry structures in the world and cuts an imposing figure against the foothills and Pintler Mountains behind Anaconda," the Southwest Montana Tourism says.

"The Smoke Stack was built in 1919 as part of the smelter that processed copper ore from the mines in Butte. When the mine closed in the 1980s, the smelter was demolished, but the Stack remains, and has become a symbol of the town.

"The Stack used to be covered in terra cotta, but the terra cotta has eroded off the bottom two thirds, leaving the top third darker than the rest. The Stack is inaccessible to the public, but there is a viewing site with interpretative signs in downtown Anaconda."

"The old Anaconda Copper Company smelter stack, completed in 1919, is one of the tallest free-standing brick structures in the world at 585 feet. The inside diameter is 75 feet at bottom, tapering to 60 feet at the top. In comparison, the Washington Monument is 555 feet tall," the Visit Montana says.

"The stack dominates the landscape like the Company once dominated the area's economic life. Since the smelter closed in 1980, the stack has become a symbol of the challenges that face communities dependent on finite resources.

"Listed in the National Register of Historic Places, the stack may be viewed and photographed only from a distance. Interpretive signs that detail its history are located in the viewing site near Goodman Park."

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