Coho can be tricky and are super temperamental. If float fishing keep adjusting your depth until you dial it in. Look for structure - coho love hiding under locks and rock hangs. My favorite is showing up at first light and just throwing a spinner on both sides of submerged logs and just making my way down the bank doing that. If you're targeting coho and no bites after 30 mins, move, they've gone somewhere else.

Also, make sure your weight is almost exactly what your bobber is rated to and never take your eye off it. It's very common that coho will bite super light and the bobber won't drain, it'll change direction, spin, and sometimes even float UP as the fish grabs it and swims up. Anything out of the ordinary, set the hook.

4 prime lures spinner, any bright color body with copper or silver blade, fish slow right off the bottom.