Holy crap, I just ran into this black rat snake too! I'd say he's about 6 feet. He's basically a sitting duck right now because he's getting ready to molt, so he's not hunting or anything. (You can tell by the whitish/blue hue in his eyes.) These black snakes are harmless to humans; they eat bird eggs and small rodents. He was out sitting in a sunny spot probably trying to warm up. We also have breeding red shouldered hawks on our property and if they see this guy, he could be a goner!
So, I obviously brought in a camera today. It's not mine though. I really need to invest in a digital camera!!