Mike, This is cool. Good work!
Shouldn't you label the whole canyon as rattlesnake zone? Just sayin'...but otherwise thanks for the maps helps put a lot into prospective.
Andy, it's true that the bastards are everywhere. However, the zones I flagged are some of the places where you simply should not even go during snake season. If someone told me "hey, I want to see some rattlesnakes", this is where I'd take them.