Check with Poppy or Dale at the Red Shed in Peck when you hit town - they generally have some pretty good intel. The good news is that Rt 12 parallels the river for most if not all of the stretches of the river you would want to fish - which will be mostly below Orofino I suspect, and more likely down toward Lewiston. The bad news is that this year's run was tragically low - worse than last year's abysmal returns. I got 1 fish in 12 days, and a friend from the area told me I was doing better than most.
Good luck, it's a fun river to practice casting.
I can't understand why some folks think a drink can is harder to carry out when it is empty than it was to carry in when it was full.