Just a couple of quick thoughts, FWIW;

First, from the link it sounds like there are several local snakes that could be mistaken for each other. I'd suggest treating all as if they are a rattler.

Second, I've been told they will slither away from noise/vibration etc. if they have a chance, and will strike if surprised or cornered. This is where a good walking stick might prove valuable. Use it to poke around in any place a snake might be or where you don't have a good view of what is there, especially before you stick your hand in or reach to pick something up. Helps give the snake warning and helps you keep your distance.