The largest native species in North America is the Eastern Indigo Snake: Eastern indigo snake - Wikipedia, the free encyclopedia
And the Black Rat Snake is a close second: Pantherophis obsoletus - Wikipedia, the free encyclopedia
But that snake looks to be well over 10 feet so that raises the possibility that it is a non-native species and I'd guess an anaconda.
It became quite trendy during the Goth period on teenagedum to own a snake as a pet, and the pet of choice for the X-treme dudes was an anaconda. But like so many irresponsible pet owners, the shine comes off and the chores get old and they just release the animals into the wild. Perhaps that is what we are seeing here.