A planned rail transit spur in northern Virginia has moved another step forward, with U.S. Transportation Secretary Mary E. Peters' approval of a $900-million, multi-year federal funding commitment towards the project's $2.6-billion first phase. With Peters' Jan. 7 action, the proposed "full funding grant agreement" goes to Congress for a 60-day review. Slide Show Photo: Metropolitan Washington Airports Authority First phase would carry line part way to Dulles airport. Related Links: FTA Approves First-Phase Funds for Virginia Rail Project The $900 million would help finance an 11.6-mile first stage of a planned 23-mile extension of of the Washington Metropolitan Area
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.