WILTON James L. Wilton, former chairman and president of San Francisco engineering firm Jacobs Associates and an expert in excavation design of deep cut-and-cover structures, died on March 16 in Woodside, Calif., of lung cancer. He was 83. Wilton, who joined the firm in 1957, was named president in 1974 and chairman in 1985. He served in those posts until his 1992 retirement. Wilton worked on numerous large global projects, including rapid transit systems in San Francisco, New York City, Boston and Washington, D.C., Venezuela’s Yacambu irrigation tunnel, the Arenal power tunnel in Costa Rica and the Victoria Arts Center
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.