Navydoc, I see you’ve relocated back to SD and are enjoying your new digs w-a-a-a-ay out in lizardland 😉
If I were you, I would have killed it. I would have been too afraid it would later attack my dog or a family member. As you probably know, rattlesnake antidotes are horrible to go thru, for man or beast. And one doesn’t have to mess with one to get bitten. They could just inadvertently disturb it and it could attack. The recovery from their bite is horrible to go thru, as well.
If you see it again, I would advise you to kill it, or at the very least, trap it in a plastic garbage can with a lid and call animal control to see if there are any agencies who will to “relocate” it far away.
I have a feeling that one won’t be the last one you will see. Among other creatures, they are part of the “territory” when you are living in a recent development encroaching upon “lizardland.”