Check with John Smeraglio at Deschute Canyon Fly Shop. These guys are friendly and don't act like they own the river like some guides. Last time I was there you could go with a drift boat or "drive-in" The drive in option is great as you get to learn the spots you can access yourself at a later date. I actually prefer to fish that river without a drift boat just because there can be so many of them on the river.