I also think it was a hognose--those are protected in some states. Totally harmless--unless you are a toad.
I don't know of any other snake that will put on the show they do--spread the head and neck like a cobra (hence the name "spreading adder" or "spreadenadder" around here--said as one word). They will hiss, even strike--but the strike is ALWAYS away from an object. Say you put your hand to the left of it's head, it will strike to the right, and vice-versa--they will NOT bite you (unless you smell like a toad).
If this display doesn't work, then it's on to Act II. It will convulse, roll...act like it's been poisoned, and wind up on it's back "dead", complete with it's tongue hanging out. Funny thing is if you roll it on it's belly, it will roll over on it's back and continue to play dead until it thinks the threat has passed.
One of God's great creations--lots of fun to watch, rare around here--I've only seen one is the last several years.
Snakes are like guns--some people are terrified of them because they are uneducated about them. The answer isn't to get rid of the guns, or snakes. The answer is to educate yourself on them, and eliminate the fear.