Construction is under way on the largest and most expensive highway project in the state of Utah, the $1.725-billion Interstate 15 CORE project. This week, crews from a consortium called Provo River Constructors began prep work along a 24-mile stretch, which included grading shoulders to add two lanes in both directions, the extension of a drainage pipe and the demolition of three bridges. Later stages of the project will rebuild and reconfigure 10 freeway interchanges and replace 55 aging bridges. Provo River Constructors includes Wadsworth Bros. Construction, Draper, Utah; Fluor Corp., Aliso Viejo, Calif.; and Ames Construction, Salt Lake City.
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.