Don’t think you can fish the mouth of joe creek in unless something changed. It’s a pretty small section of water, only open between the 2 bridges, not much access or parking. I do remember seeing an adventurous guy in a pontoon down there once, though.
I used to fish the copalis behind the green lantern tavern a bit when I lived out that way. Seen some very nice fish in there but they really seem to get the lockjaw bad. It’s a really snaggy river too.
For salmon your best bet would probably be the humptulips up by the hatchery. This time of year was always my favorite, usually some big late silvers around. Good eggs or #5 vibrax spinners will do the trick.