Ahighway improvement project that runs through a national park is serving as a test case for formalizing a road rating system similar to the Leadership in Energy and Environmental Design building rating system. Photo: DEA A road improvement project may be the first to be officially rated “green.” The 3.8-mile, $16-million U.S. 97 Lava Butte-South Century Drive upgrade in central Oregon runs through the Newberry National Monument. It is the furthest along of three projects the Oregon Dept. of Transportation will evaluate to determine if it will adopt standards set by Greenroads, unveiled by the University of Washington and CH2M
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.