The North Carolina Dept. of Transportation (NCDOT) has set Sept. 30 as the new target date for completing the Oak Island Bridge project in Brunswick County, N.C. Part of a new 4.5-mile link to connect Oak Island with the mainland south of Wilmington, the troubled $36.5-million project has twice experienced lengthy delays since work began in August 2007. Construction was halted for six months after a 121-ton concrete girder fell 40 feet from a temporary support brace in December 2008, killing one worker and injuring two others. Prime contractor Barnhill Contracting Co., Tarboro, N.C., and bridge erection subcontractor Lee Construction
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.