One of my favorite techniques that was until recently a secret of O.P. guide Bob Kratzer is jigging a 1/4 ounce jig.

If you find coho in slack water, which is common, simply cast your jig, let it drop to near the bottom and jig it back to you. Try to imagine the jig making 10 inch hops up and down as you slowly retrieve it. Lift your rod tip about ten inches, drop it fast and reel in the slack as it drops. Coho will slam this. I have gotten dozens on my home made jigs. I use a Gami 1/4 ounce jig head and tie on Flashabou. Best colors seem to be cerise, copper, red and blue.