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[rightsideout]

82. Looks like a healthy Brown Water Snake

I agree with those who say it's a Brown Water Snake. It has the markings.

The head and tail don't look like a Water Moccasin because it would have a pit viper shaped head and the tail would be thinner at the end. It doesn't look like a python. It's probably back in the creek again. They like to sun themselves on rocks which may account for it being on the patio. They are also pretty quick from what you said.

I keep lizards (iguana, gecko, chameleon) although I used to have a pet Boa Constrictor so the snake people may know more. My first thought was a Boa Constrictor since they often get released if they get too big. But it looks more like a Brown Water Snake.