"Use some logic."
Great advice, but it also helps to know what you are talking about.
BLM has one set of locks. The keys are marked "Do not Duplicate". It is a federal offense to duplicate a government key. Don't expect them to go to the expense of purging their system because one nitwit is misusing a key.
Sounds like you have your own ideas about how to run a website for the hot springs, Mike. Let us know when you have it up.