OPAC Engineers Mark Ketchum lectures at site of innovative Third Carquinez Strait Bridge in California, built in 2004. I-80 pedestrian bypass bridge in Berkeley, Calif. is "an enduring example of civic infrastructure that excels in both function and form," says Mayor Tom Bates. Related Links: Structural Engineers of Northern Calif. April 2014 News-Link to Mark Ketchum tribute by engineer Reinhard Ludke Online obituary and link to tributes Advancing Civil Engineering Design, Online Tools for Design, Analysis and Professional Development OPAC Engineers website VIDEO: Mark Ketchum presentation at 2013 ASCE Structures Congress on The Third Carquinez Bridge: A Modern Interpretation of
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.