The consistent fall fishing pattern we are so used to here on the Yakima has the fish (and our guidestaff) in a rhythm. Cold mornings warm into pleasant afternoons with highs in the low 60's. The sub-surface bug activity has the fish looking for stonefly nymphs, October Caddis pupa and BWO nymphs early in the day, with some shots at fish feeding on October Caddis adults in the afternoon/evening hours. If we are lucky and get cloud cover, we've even seen some great small-bug fishing on Blue-Wings and Mahoganies. A great time to be on the water for sure!
It looks like we will see more of the same this week weather-wise, with warm, sunny afternoons. Although this does not bode well for our mayfly hatches, There should continue to be some opportunities for dry-fly anglers in the form of the October Caddis hatch. An orange Stimulator or PMX in #8-12 will usually get the job done when imitating these bugs, and don't be afraid to throw in some skating/twitching action to compliment your standard dead-drift. If you aren't finding any love on top, a Pat's stone in coffee/black (#8-10) trailed by a smaller BWO-type nymph has been picking up plenty of fish under an indicator. With the water getting cooler and the fishes diet focusing more and more on small bugs, consider using a yarn indicator in lieu of the traditional Thingamabobber to help detect those light takes.
We are seeing some great weather and fishing, but who knows how long it will last. It's the late-season here on the Yakima, come enjoy some great fall fishing!