The Flin Flon stack, at 250 m (825 ft.) tall, is the tallest free-standing structure in Western Canada. By comparison, the Effiel Tower is about 305 m. (1000ft.) Built in 1973, it tapers from a 20 m. (65 ft.) diameter at the base to 7.6 m. (25 ft.) at the top. It has a 5.2 m. (17 ft.) diameter stainless steel liner. The wall thickness tapers from 66 cm (26 in.) of concrete at the base to 25.4 cm (10 in.) at the top. It has enough steel in it to build 100 cars and enough concrete to pour 150 basements.