Primoris Services Corp. was created in 2006 with West Coast contractor ARB Inc. as its major subsidiary. Shortly thereafter, it went public. Photo: Courtesy Primoris Services Corp. Related Links: The Top 400 Contractors: At a Glance But Primoris really took off at the end of 2009. It acquired James Construction Group (JCG), Baton Rouge, La., from Angelo Iafrate Construction Co., Warren, Mich., for $135 million. Last November, it acquired Hillsboro, Ore.-based pipeline contractor Rockford Corp. for $82.6 million. With these acquisitions, Primoris is no longer primarily a West Coast firm; now, it is a $1-billion con-tractor whose reach stretches from
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.