I loved the old Portland Century that ran into foothills of Mt Hood and the Bull Run watershed (10-15 years ago?). Also the Lolo Pass century with its incredible climb up Lolo Pass. Those dramatic centuries meant I forgot about the quiet,not nearly so dramatic Harvest Century though the Washington and Yamhill counties and farm country every September. Did it again after the Crater Lake Cycle Oregon was canceled due to the fires. The ride is a pure joy. Beautiful roads and country. Very well run by volunteers who do it for love and have been doing it a long time. Great food. Rode it and kept wondering "why did I ever stop?"
Now, if someone did Lolo Pass again, I'd be there in a flash. A lot of the lead up roads are not so nice but that climb is one of my all-time favorites. Well, it's been enough years since I did it, it might be too sobering, I held my HR at 164 all the way up it and had a 30 yo on the ropes. Those days are long gone.
Ben