Nick, the question is a bit broad so hard to answer. Most of the rivers in October and November will have coho salmon. One should not place so much emphasis on "prime spots", since a location can be productive on one day, but fishes poorly on the next day. Coho salmon are constantly on the move when the river level is high enough. My suggestion would be to give the Chilliwack River a try in the next couple of weeks, or the Fraser River by either roe fishing or spincasting. Stave River, Chehalis River will also produce coho salmon until the end of November. Try getting out there and fish a few spots several times so you get to know it intimately. So far this season we have been fishing two locations on the Chilliwack River repeatedly. On some days, fishing has been poor while other days fishing has been excellent. The objective is to fish it well when the fish are in by learning the spot thoroughly. Good luck.