Wow terrific sleuthing there my good man Watson
This picture just seemed like something I'd expect to see along the i5 but it was the reason I thought of Washington as this is what BC looks like and Washington is on our Southern Border:
In saying that I didn't spend a lot of time paying attention in Oregon as it was more a case of "get there, get back" with Oregon. The only thing I really did there was stop to do some ATV riding on sand dunes in Southern Oregon and then detour to drive up the Coast for a bit.
If it were Oregon I'd guess Northern as Southern is a bit dryer iirc.
Fingers crossed it's both as I'd love to see them work Eastward from that point on as I'd love to see both sides of the Rockies and the diversity offered in other States such as Idaho and Montana.