Hey there! So what are you planning on using, gear? My family and I fish the columbia, willamette, bays and tributaires here in the PNW. If you're targeting fall chinook a 8-6"-10-6" rod with a moderate heavy action and enough back bone to support up to 8-16oz. of weight is what you want. Not much better lure out there to use than a tuna wrapped kwikfish or wobblers. Clancy, simons or brads are good wobblers.
Up near the cowlitz and lewis rivers we use simons wobblers, depending on the tide. anywhere from 6-16oz. of weight. We recently limited out using lead and spinners, right near government island.
I've had several hits, as well takedowns in the tributaries by fall chinook or coho. while fishing for heads. Wigglewarts, flatfish, jigs. Rarely though in the Big C or Willy have I caught URB's or coho on steelhead gear, more than reverse in the big river. I caught 2 steelhead 2-Thursdays ago on a K-15 anchovie wrap and quite a few on a brads super bait packed with tuna.
Hope this helps, love fishing and talking fish!