For many firms in the construction industry, the market recession is well into its third year, and most executives believe it shows no signs of abating. Specialty contractors and subcontractors have been hit particularly hard; few had healthy backlogs to tide them over for an extended period of time. Many large specialty contractors have gone into survival mode, accepting lower revenue levels, pursuing only those projects that make sense and only working with customers and partners they trust. The impact of the downturn can be measured by the results of the ENR Top 600 Specialty Contractors survey. The Top 600
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.