The Alpine Century is also in August, near Monroe, Oregon. It's a great course, one of my all time favorites. Similar to the Willamette Gran Fondo that was just held, but better IMO by not being an out and back, and has a lower entry fee and supports a rural nonprofit.
Cascade Bike Club has the High Pass Challenge in Sept. Never done it, have heard it's a nice course. Cascade also has the Kitsap Color ride around the first weekend of Oct. The longest option was 70 something IIRC. I thought it was scenic and mostly enjoyable the one time I did it. Roads were higher traffic than I prefer though. Salem Bike Club usually has the Peach of a Century near the end of September.