That was a close call, Sidewinder Slim.
Yep, plenty of rattlers in eastern Oregon and my native eastern Washington.
Funny, everyone thinks that Washington is all rain and damp. They little realize that, like in Oregon, the moisture comes off the Pacific Ocean, hits the Cascade Mountains, and dumps most of its load on the west side of the mountains.
Point in fact: Once you get to the east side of the Cascades, there's a lot of sagebrush and open space, punctuated by lava rock outcroppings. Prime habitat for rattlesnakes.
Dad and I used to fish the Columbia River when I was a kid, on the east side. Saw plenty of rattlers as we made our way down to the shore. We left them alone.
It was particularly dangerous for Dad, though, because all his life he'd had hearing problems. There were certain tones he couldn't hear --- among them was the buzz of a rattlesnake!
And you couldn't bring Dad into an antique or glassware store! Sure enough, he'd find a bell, pick it up, start ringing the bejeezus out of it and never hear it!
Everyone else in the store could, though! Gawd, Mom and I shot him some glares over the years!
Once you've heard a rattlesnake buzz you'll never forget it, or mistake it for anything else.
I leave all snakes alone. The rodents and their propensity to cause damage and spread disease is more of a threat to me.