I have trolled on the Columbia in a few spots upper river and bouy 10. Leave your downriggers at home divers are what most use on the lower Columbia. Also the flasher we use in the salt are not what they use they use the more triangle ones that are kind of like a big spinner. The Columbia is much larger then the Fraser, water clarity is better and I would say it's a far better salmon producer then the Fraser. At bouy 10 there can be as many as 200-400 boats on the water and with an outgoing tide the current can really rip. I bet u would be able to catch some on the Fraser once you figure out a good spot and a technique that works for ya.