I have 7wt S9, would that suffice?WA side has a lot more back cast room but the fish tend to be further out. You need a VERY fast sinking line. Oregon side (from the island), fish are in closer but you need to be very good at shooting line out from a roll cast.
Been a very long time since I've fished either from the bank, but fly rods are do-able if you're prepared and capable.