Finding a club or group of jet pilots to help you with some local river navigation guidance is an excellent idea. Venturing up the Canyon, Harrison or the Pitt River can be dangerous and there have been several accidents/fatalities this year. Right now with the salmon season, guides are on the water and probably not even remotely available for assistance with this currently.
With the water at its near lowest conditions, this is really a dangerous time to venture out alone in unfamiliar waters - even with a jet. We've got lots of gravel bars and some dangerous areas that you need knowledge on. You also need cell numbers for emergency river support.
Many of the non-guide locals will be willing to help and spend some time with you. The guiding services are also an excellent resource for information and in all seriousness, you might even contract the services from someone like Vic at STS or Bent Rods or talk to the guys at Fred's Tackle. Nobody wants to see anyone in any dangerous conditions on the local waters so you're going to get help and advice. These guys are also very much in the know of everything that happens on our waters and they will steer you to any known boating clubs.
You'll surely get the information you're looking for very soon, but really Fred's might be your best bet right now.
Good luck.