Ralph R. Peterson, who was set to retire next month as chairman of global project manager CH2M Hill Cos. after building the firm into a $6.5-billion, 25,000-person industry force, died late on Sept. 1 from complications of cancer. He had battled the disease for several years. He was set to turn 65 on Oct. 12. Peterson spent 44 years at CH2M Hill. "I will miss his intellect, his ability to deal with complex issues and his desire to help others succeed," company CEO Lee A. McIntire told employees in an internal email. "He was an industry icon." The former Bechtel
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.