Rehabilitation of a 368-ft-long,70-year-old Warren through-truss bridge in Westfield, Mass., is now a major urban revitalization project that includes three bridges and a half-acre of parkland, as crews deal with live trains, endangered mussels and sub-zero temperatures. “Originally, in 1994, we were just studying the old bridge,” says Mark Ennis, project manager for STV Inc., New York City, the principal architectural and engineering firm for the $70-million project. “We found it could be rehabbed. The work would involve replacing the deck system and some strengthening of truss members, repainting and updating of the bearing systems.” Graphic: STV Inc. Warren truss
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.