In 2011 our 13 year brood emerged here. I have to agree that I don’t remember anything like that ever! I’m 47 and you’d think I would remember something like that. The sound is maddening. That many for 3 weeks is definitely something to stick in the mind. I hear the normal annual cicadas every day and it’s just like hearing the fridge run. I hear some right now as I sit on the couch and watch baseball. There’s just no comparison between the two.My area looks like the end of days/locusts with the infestation of cicadas. I've grown up with them and always thought they were neat...but this is beyond anything I can describe. I don't recall this 17 years ago!!! The noise is deafening to the point it drowns out the rooster!!! Initially the chickens were interested in the first to emerge but now the swarm is too intense/noise too much that the are not even bothering with them.