f you want to avoid traffic, Mountains, curvy roads, and ice/snow I am thinking you don't want to go to Oregon that time of the year. No matter the route you take you can or will see some of all of these. Good Luck with your travels
I agree with the above post. You will have to deal with one thing or the other in order to drive from your location to Portland OR.
My route would be:
I-10 to west side of Phoenix....take ring route 101 (Agua Fria ) to 93 ....then 93 to I-40 to Barstow....then 58 to Bakersfield then over to I-5.....Don't pass Redding CA with out getting favourable weather forecast and road conditions for Siskiyou summit (4300ft) You should be ok unless a storm is imminent, or has just dumped some snow.....one days drive from Redding will put you easily in Eugene, or Portland if you want to drive further.
Yes, there will be hills & curves along the way, but it is mostly Interstate hwy so you do have a slow lane to drive in....if you run with the trucks on I-5 you will be driving 59 mph and going with the flow.....if possible pick your times for Phoenix and Sacramento to avoid rush hours.... hills and curves will be on I-40 west of Kingman ....58 over the Tehachapi to Bakersfield....I-5 Siskiyou Summit, and Grants Pass to Cottage Grove.......