If Nashville's Grand Ole Opry House flooded with 20 feet of water, the best seats in the house would be in the balcony.
That could happen if Wolf Creek Dam, near Jamestown, Ky., had a critical failure. Grand Ole Opry performers 275 miles downstream would have to be evacuated, and the estimated damages could run up to $6 billion. The risk of the dam's failure makes a $594-million remediation a top priority for the U.S. Army Corps of Engineers.