Although we’ve been having quite a few cold days, the Yakima is fishing very well. Fish have have been podded up and eating nymphs very consistently in the slow, walking pace water. The best way to find these pieces of water is to stick to inside corners and tailouts, and fish the water closest to you first, before trying to cover the entire run.
Our best setup right now has been a size 10 or 8 stonefly nymph, with some sort of small midge below it. Having a wide range of colors can be very helpful, but keeping a few red, copper, and black bugs in sizes 18 and 20 will be your best. Pearls, blues, and purples are other great options to try.
We’ve also gotten a few reports of streamer fishing being pretty decent with smaller, more natural colored flies being your best bet. Woolly buggers, micro leeches, and small sculpins are all a good choice. Just remember to use a heavier sink tip to get your fly down, and keep your swing slow.