To avert potential water crisis, tunnels may be drilled through Arizona dam

The U.S. Bureau of Reclamation will examine the possibility of drilling tunnels through Glen Canyon Dam to ensure water can pass through it at low Lake Powell elevations, two knowledgeable sources told the Arizona Daily Star. Such a reengineering project will be among several options the bureau will look at to temper new concerns about the ability to deliver Colorado River water through the 61-year-old facility. The tunnels could prevent a catastrophic occurrence if elevations at Lake Powell ever fall so low that no water could get through the dam...