I have never been to that river but roe should work pretty effectively for sure. Small gob behind a bright oragne/yellow spin and glow to get it slightly off the bottom, with a drop weight 24-30" up on the line, weight depending upon current. Use to work EXTREMLEY well on kings in AK on all the smaller rivers.... Started to give it a go here but got hung up on "when in Rome approach", which worked, but roe is hard to beat for Chinooks of any size... Especially if it is a river with alot of bends and small holding pools.. Chinooks along with Silvers tend to short biters, leave the second hook (if legal in that water???) a bit lower say like 3-4 inches than normal. If you start getting in to them pretty good record how many are caught with the second hook versus top bait holding hook. It looks a bit odd but it does work...... Also used to use a Fluorescent orange blades Vibrax, super, super slow just slightly dragging bottom on return, it was a killer....