Construction has begun on India’s strategic 8.8-kilometer-long, $363-million Rohtang Tunnel. Built at an altitude higher than 3,000 meters in the Pir Panjal range of the Himalayas, it will provide an all-weather road link across the snow-capped Rohtang Pass. The tunnel will provide year-round road access to the remote regions of Lahaul-Spiti and Pangi Valley in the state of Jammu and Kashmir. Conceived in 1983 and faced with many procedural delays, it is now being constructed by the Border Roads Organization under the Ministry of Defense. BRO awarded the project to a joint venture led by Austria’s Strabag A.G., Vienna, with
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.