A consortium led by Parsons Transportation Group Inc., Washington, D.C., has won a $1.46-billion, design-build-operate-maintain contract for 20 miles of light-rail lines in downtown Houston. It is the Metropolitan Transit Authority (METRO) of Harris County’s largest contract. The Houston Rapid Transit JV also includes Granite Construction Co., Watsonville, Calif.; Kiewit Texas Construction, Fort Worth; and Stacy and Witbeck Inc., Alameda, Calif. The team will extend the north, east-end, southeast and uptown lines; build storage and inspection facilities; construct 32 stations; and renovate an existing operations center. METRO selected the runner-up Parsons team after breaking off talks with Boise-based Washington Group
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.