there doesn't appear to be any guardrail left there in your pic, was probably taken out in a previous incident, and thats why the concrete bridge was the worst choice, it wasn't protected at that point, you were with it enough to realize that , but not really aware the guardrail had ended.
I'd go back and take a few pics to prove that guardrail WAS NOT there or you may end up on the hook for it ( not that the state would double dip and bill more than one party for the same thing, things like that never happen )
