As the U.S. Army Corps of Engineers’ Chicago District considers possible scenarios for closing Chicago’s locks to keep predatory Asian carp from entering Lake Michigan, the U.S. Supreme Court is set to decide if it will hear a lawsuit that could force the locks’ closure. Lynne Whelan, Corps-Chicago District public affairs officer, says the agency is studying several options, including closing the locks to boat traffic as many as three or four days a week. Michigan Attorney General Mike Cox filed a lawsuit with the high court in December to force closure of the locks. The court is expected to
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.