Adding weight is going to help you 95% of the time, I usually go for one larger split shot. Fished the upper yesterday and had 20+ into the net mostly on the nymph or bead with some dry fly fun thrown in as well. With that being said the lower canyon is quite a different beast from the upper and with low water right now you may do better some days with no weight and be sure to have a very small indicator or consider using yarn. If you would like to get out and fish give send me a PM. I am based out of Yakima and am on the river usually a minimum of two days a week. That goes for anyone else around the Valley, have a boat and enjoy getting out with new faces, bonus points to those that "know how to row"