There are lots of guide services, mostly they will fish you from a boat and provide anything you need. Lots will rent you a boat and just send you out. The river fluctuates dramatically when they crank up generators, and experience is essential, IMO. Gastons is the biggest float service, and they are just below the dam. One of the few that run season-long. There are fewer that rent waders and all. With both it is important to get someone with experience. The newer guys are mostly hunting $ more than repeat customers. If you want guided fly fishing, and a very clean place to stay (woman friendly-Albie liked it), I highly recommend Dale Fulton's Blue Ribbon Lodge. He grew up here and at one time guided and owned fly shops in both West Yellowstone and Mountain Home. Now he and his wife just run the lodge north of Hwy 412 on Denton Ferry Road. I've known him for >25 years, and always stay there, even when not fly fishing. Really, it is easy enough to just go over there and throw a spinner into moving water. But, call Dale, he can put you on a reputable wading guide, but his leanings are to fly fishing, of course. Definitely stay there, the best for a quiet retreat. Tell him Tim recommended him, and promise not to burn down the lodge.