The Wasatch Mountain Club would be a good place to start. They have a very active boating division.
Utah Whitewater Gear is a great rafting & whitewater shop. They are a sponsor here on MB. Good place to go for gear & info. They have a spring gear swap, and I think they will be doing some safety clinics this year. Go to the gear swap and you'll meet local boaters.
Welcome to Utah.
"We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love....and then we return home."
Australian Aboriginal Proverb