Leaders of the Senate Environment and Public Works Committee—two Democrats and two Republicans—have taken the first major action this year toward passing a long-delayed multiyear surface transportation bill. Industry officials welcomed the May 25 announcement that the four lawmakers had agreed on a framework for a $339.2-billion highway-transit measure that could stretch to as long as six years. But the plan is a long way from getting enacted. The senators haven’t lined up firm sources for all the funding, and a not-yet-introduced House version may well come in far south of $339 billion. Construction officials praised the milestone proposal, announced
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.