Battling floods, difficult soils and the environmentally sensitive nature of the Amazon rainforest, crews are building a 3,600-meter-long, $400-million bridge with a 400-m-long cable-stayed central section over the Negro River using a 400-barge working platform. The project, marked by a death and environmental controversy, is intended to boost economic development in the Amazon. Brazil’s Manaus-Iranduba Bridge, scheduled for completion by year’s end, will straddle the river close to where the waterway merges with the Amazon River. The span will create a land link between the city of Manaus and the town of Iranduba as well as 30 other, smaller municipalities.
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.