ALI It is no secret that all levels of government are facing unprecedented budget deficits. While state and municipal revenues are dropping, infrastructure needs are growing and the question of sustainability is taking center stage. Can we afford to keep those infrastructure assets and all four million miles of paved roads in the U.S.? I work with asphalt every day, and I can tell you from my long experience that there are some good answers. Photo: Donna Short In 2006, the 50th anniversary of the Interstate Highway System highlighted the contrast between the condition of the roads in recent years
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.