Fastest, definitely, would be I90 then 395 down to I84 to Portland. 2 is a good road, but slower, towns to go through (not past!!), maybe more scenic (?). Also, much farther north, so I would think that the mileage would be more by the time you got to Ptld.
'16 Outdoors Timber Ridge 280RKS
Reese 1700# Trunnion w/ DualCam HP
'03 EXCURSION XLT V10 4.30 Axles