Richard C. Halpern, a Chicago-based construction manager who oversaw numerous high-profile domestic and international building projects during a 50-year career, died July 3 of complications from cancer treatment in Houston. He was 78. Photo: courtesy of Rebecca Halpern Richard Halpern As an executive at former building firm Morse Diesel, Halpern managed the construction of the Sears Tower, the world’s tallest building when it opened in 1974. He was among three executives cited by ENR in 1974 for their roles in the landmark project, which included the industry’s first major effort to recruit minorities into its workforce.In 1976, Halpern co-founded CM
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.