I know you can ask for Probation Before Judgement in many states. My dh is a long haul truck driver and has done this.
What PBJ means, is that often the judge will not fine you but if you have another speeding ticket in a year, you not only get that charge, but the previous charge too.
I am pretty sure you have to go to court. Will CA recognize a ticket from Oregon? Sometimes states don't recognize tickets given in other states. Just pay the fine and it won't show up on your record.
Good luck!