After nearly a decade of review, the Dept. of the Interior gave the go-ahead on April 28 for the nation’s first offshore wind farm—the $1 billion Cape Wind project, located off the coast of Nantucket. Construction on the project could begin as early as this year, says the project’s developer. But the project is highly controversial, and a broad coalition of historic-preservation and environmental groups, along with Indian tribes, say they will file a lawsuit to attempt to block the project. In response to critics, the Interior Dept. says it will require Cape Wind Associates LLC, the Boston-based developer of
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.