Well the dam would be a suicide effort but with only one road leading to and across it, I'll wager they're sniffing for radiation night and day, and air and boat access would be detected damn quick.
(Recent news item under the radar: recently, people undergoing radiation therapy have been stopped and questioned by officials in the NYC subway. Sniffers have been installed on the streets as well.)
I wonder if a briefcase nuke would do enough damage to Hoover Dam. They say you could ram an airliner into it.
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