Water Tower Place in Chicago was the tallest reinforced concrete building in the world from 1975 to 1990, when it was surpassed in height by 311 South Wacker Drive, also in Chicago. Water Tower Place is 76 stories, 859 feet tall and contains concrete with a strength of up to 9,000 psi.
Named after the Chicago Water Tower, the building was designed by Loebl, Schlossman, Dart & Hackl. The commercial construction company who built Water Tower Place was Inland-Robbins Co. A conventional design was used for the bottom 12 floors and a tubular design for the top 64 stories, using lightweight and normal weight concrete, as well as high strength concrete.
Water Tower Place could not have been built before the mid-1970s because concrete made before then would not have supported the massive structure. In the 1950s, any concrete with a compressive strength of 5,000 psi was considered high-strength. That definition changed in the 1960s, when high-strength concrete was anywhere between 6,000 and 7,500 psi. It wasn't until the early 1970s that concrete with a strength of 9,000 psi, the strength of some of the concrete used on Water Tower Place, was developed.
Advancements in improving concrete's strength have continued to improve the material even beyond the time Water Tower Place was created; modern concrete can reach strengths approaching 20,000 psi.
Not only is the building composed of concrete, but concrete also lies underneath the building site. Construction was delayed unexpectedly for several weeks when the commercial construction company discovered a stream running under the building site. They resolved the problem by creating a giant concrete dome to plug the water so that construction could continue.
Even though taller buildings have been built since 1975, Water Tower Place, which remains fully operational today, marked a major milestone for commercial construction companies in the advancement of high-strength concrete and the new capabilities this innovation afforded.
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