Senate Environment and Public Works Committee Chairman Barbara Boxer (D-Calif.) has urged top U.S. Dept. of Transportation officials to weigh in to help end what she termed a "standoff" with the House over the length of a surface transportation bill. Photo: Senate Environment and Public Works Committee Barbara Boxer (D-Calif.) With a current seven-week stopgap highway and transit authorization set to expire Dec. 18, Boxer and leaders of other key Senate committees have lined up behind a further six-month extension. But Boxer said House leaders support much shorter extensions. At a Nov. 18 briefing of her committee on highway funding
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.