So from 2050 on, people should be wary of being below the Dam, just damn man!
On another note, there are still die-hards that insist upon "Boulder Dam" as the name - something to do with a depression and FDR not getting the naming rights.
Not only Boulder/Hoover Dam but all concrete structures 100 years old or more will be in need of replacement. That why there is talk of dam and bridge replacement to keep our infrastructure from failing.
Wiki has many facts and is an interesting read in general reference, also touches on the naming controversy...
http://en.wikipedia.org/wiki/Hoover_Dam