Two places we've concentrated our efforts fishing Coho in October; Davis and Camas and above. For us, it's weird in that things that work in one, don't seem to work in the other. At Davis, it's been a Brad's Chartreuse Jack Cut plug, fished suspended between the barges and especially in the prop wash of the working tugs. Discovered that by accident one day when a tug came down to get one of the tied up barges. As it turned, we had to make a quick maneuver to get out of the way that put us across it's prop wash. Both rods pounded down and it's worked other times since.
At Camas it's been location. Either off the mouth of the Sandy. On the bottom with 3.5's in traditional Coho colors and suspended with 3.0 Corn Chowder Spin n Fish (it's so weird writing that). Also, both things suspended, trolling above the green buoy at the top of Reed Island. We find Coho hanging in both locations. Trust your electronics. If you don't mark fish, move. I think we see Coho schooled more than Chinook, so we look for pods of fish. Find the fish and fish the slacks. jc