I went to reply to your message and it says you have blocked all messages from me. So I guess I'm in your ignore status. That't ok don't worry about it, I'm sure I get to be a little much. Didn't find out till I had already typed this out. Didn't want it to go to waste, so here you go.
Well I'm not much of a river fisherman to tell you the truth and I haven't fished the rivers besides the fall time. Like Sept to November. In the time of year you are looking there will be no salmon. But there will be Steelhead in a lot of the water ways. The Vedder/Chilliwack River has good returns of steelhead every year. The other rivers like the Stave, Harrison, Chehailis, will all have great fishing for searun cutthroat trout that time of year. I hear fishing can be very good then fly fishing and spin fishing with salmon fry immitations. If you want more information on the local lower mainland rivers then you should check out Fishing with Rods webpage. He has info on all these waterways.
http://www.fishingwithrod.com/All his articles on river fishing, take a look.
http://www.fishingwithrod.com/articles/river_fishing/index.html