off the bridge - from boats - or with hip high rubber boots wading in the stream. Only artificial lures are permitted - no worms - and everybody intent on their work as only a Fly Fisherman can be. I believe all they catch are Mountain Trout. Would have liked to stop and see what success they were having but time did not permit. We saw part of the Yellowstone Grand Canyon which while still beautiful couldn't compare with the original in Arizona. We went up-down and around mountains where the grades were so steep and so many sharp curves that it would raise the hair on your head.