I caught mine in the downstream marsh on Rainbow bait.. Did not take long.. I saw it right in the middle part of the weeds.. Threw there and got it... Just left of the swan or goose.. Trust me you will get it there!!!
Seems you have better luck if you see it first. That happened to me too. It also seems to appear in the middle of those weeds. seen it several times when I was working on my S rank there. I actually had better luck with the S on the upstream weeds but didn't 'see' the fish nearly as often there.