Been a while since I've flossed for sockeye and was never successful at it.
You want to time it ~3-4 hours after high tide in Vancouver right?
Curious on fishing near Chilliwack when its near low tide in Vancouver.
How successful is this when the tide is pulling with the river?
Don't worry about the tides so much. Pay attention to commercial and FN openings and work your way around them. Catching is quite poor for recreational fishers when Jimmy's fleet is at it in the Fraser or at the mouth, or when some of the bands along the river are drifting all day and setting nets.
Regardless of what some jesters say, any leader longer than your rod's length is an invitation to trouble, for reasons I cannot even begin to enumerate. The ideal flossing technique is with a 6-8 foot leader. It still covers a lot of water, and you can feel the pull of a fish tensing the leader almost immediately. A shorter leader also helps to reduce unnecessary tangles with other harvesters.
Remember that sockeye in the Fraser are not actively biting, they are too far from their spawning grounds for that. You are flossing them, even if the hook is in the mouth, usually lodged in the mouth's corner on the side facing the opposite bank from the one you are fishing from. Use an old-fashioned corky or a hard plastic bead to lift the hook off the bottom as they last a very long time. Wool works, too, but corkies rule in the Fraser, IMHO. On occasions you will get a biter, which will be hooked inside the mouth, but they are few and far between.
Catch your limit of sockeye and go home. Don't catch and release. With these water temperatures, the socks need every ounce of energy to complete their journey.
And most importantly, NEVER use flossing with a bouncing betty anywhere else except the Fraser for sockeye. You will incur the wrath of everybody around you if you try that on the Vedder or any other local river. And there's no need for it.
Ahhh, the good old flossing days...standing in the river for hours in sandals in +30C temps. It was fun, but that's past tense for me. If I did it today, I'd probably end with trench foot and skin cancer.

Enjoy it youngsters, and don't forget to slip-slop-slap! (Most of you will have to ask ChatGPT about that one, it's a boomer phrase, LOL!).

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