The first new steel mill in Youngstown, Ohio, in decades is being built to supply small-diameter steel pipe for robust activity in Marcellus Shale gas-and-oil exploration. The plant is conveniently located within the geologic formation’s perimeter. Marcellus Shale is a Devonian formation situated within North America’s Allegheny Plateau. The $650-million V&M Star mill, to be sited next to an existing V&M mill, will enable the owner to fill rising demand for smaller tubes ranging in size from 23⁄8 in. to 7 in. “It’s got to be the first new steel-making facility [in the area] in at least 40 years,” says
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.