I spent 13 years of my life in Texas, and I have seen more rattlers in five trips to Eastern WA and Eastern OR than I saw the whole time in Texas. They're out there, for sure. As others have said, the snake you can see is not a threat; it's the one you step on that gives you trouble. ALWAYS look in front of your feet when walking the banks of rivers East of the Cascades, especially Rocky Ford. I've been there twice and seen no less than five rattlers. Perhaps the most disturbing sight was that of a large bullsnake eating an average-sized rattler, right in the foot path. Anyway, watch where you're going, and don't make any sudden movements if you come right up on one. They will always back down if given a reasonable chance.