Mr. T,
Head down to the barrier dam on the Cowlitz and watch the folks fishing. I would suggest not to stand out in the deadline and cast the 70 yard your first time. Use a jig on the bank and have at it. If you see folks with 15 and 13 foot long rods they use those to cast those 70 yards. Watch and learn then engage with the other banky's fishing. You can walk down from the barrier dam and fish all the way down to the boat ramp. BUT the fish are all piled up in that dam area and you will be fishing with lots of folks if there is fish there.
What to use: You can ask 100 people and get 40 different answers. Most use eggs and free float them. Eggs under a bobber is also popular.
If you try to twitch with a jig be prepared for the jawing of you snagging. But if all are jigging then you jig, if all have bobbers then you do the same, If you walk into a group that is free drifting eggs and you throw out a spoon be prepared for some jawing. Mostly because you will get all cought up in their rigging.