I did this century many, many years ago and I recall being really in love with the route. Long windy roads, no terrible climbs, it’s peaceful and easy riding. It was part of the long-defunct Willamette Stage Race, staged around Eugene. It appears as though the organized century did not happen last year, and I am uncertain if it, too, is now defunct. But the roads are assuredly open.
I found this route on Ride with GPS and copied it, I am unsure if it’s exactly the same route I rode all those years ago.