I dont think anybody really cares if you want to jump to happy butt into that cold water at night time! It's not like its posted or any thing.
My biggest trip would be the bats. I used to go swimming in lake water at night and the bats would always freak me out. No real problem other than my own , not liking the bats and such but reality is. Lake water at night shouldn't be more dangerous than it is with a bunch of random people trying to tell you how to swim or what it right or wrong. Just. Do. Self.
I think you'll be alright .. if you see any one out there bring a taser get out calmlyband blast em a good one .... You'll know if it's okay to get back in or not...
I have with friends quietly, never been told we couldn't. One way to guess If you have to ask if you'll be braking the rules. You more than likely are.
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