Many times, I have easily made this connection.
If the CS is not too late, they will probably hold the EB for those connecting. I was on a late CS (beyond K-Falls), and they bussed the connecting passengers from Albany to Portland up I-5 and held the EB for the buses. If very late, they may bus you from K-Falls to Pasco.
In any case, as long as you made a guaranteed conn reservation, Amtrak will take care of you. They may even put you up in a hotel in Portland (on their dime) and send you out the next day. But if you have a room on the EB, it may or may not be available on the next day’s train! (You could be downgraded to coach.)