Trolling for salmon

Curious if anyone has some advice on trolling the lower columbia for salmon.

I live in Clatskanie, and was thinking i could launch from Jones Beach on an incoming tide, troll up the wallace slough and seining grounds.  troll the seining grounds a while, then be back in the slough before the tide turned.

Was either gonna rig up some mooching rigs, or just drop a flat fish.

sound reasonable?

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