Although ENR’s cost indexes measure the costs of nonresidential buildings, the downturn in the housing market still has a major impact on index movement. During this quarter, lumber prices in the indexes were down another 1.8%, after dropping 23% over the previous four years. Falling lumber prices had been offset by surging steel prices. However, the current recession has sent steel prices tumbling. As a result, the Building Cost Index (BCI) fell 1.8% this quarter, pulling the year-to-year escalation down from 7.3% last fall to 4.3% this month. The Construction Cost Index (CCI) is less affected by these swings in
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.