It’s one thing to think you know where the trout are. Last time you may have hooked up near some structure or on an eddy line and that gives you a good reference. But seeing where trout are sitting under the surface can put you a huge step ahead of other anglers. Check it out,
My favorite referral to finding trout, foam is home. That stands true for the most part, on this snorkel trip majority of the trout spotted were on eddy lines. Between the main current and the slack water to the side (eddy) a trout can choose its most comfortable current speed and happily sit while food drifts to them. One of the most deadly, and enjoyable tactics to catching these trout is swinging a streamer from the faster current into the slower current. This covers the lie pretty thoroughly.
When it comes to dries and nymphs there are two approaches. Cover water quickly or cover water thoroughly. When moving quick (such as from a boat) make your first cast count and get it in the correct zone. This takes experience and a bit of luck to sometimes guess exactly what piece of water the trout are sitting in. When covering thoroughly it’s best to start near then far to cover the different current options along the eddy line.
On a blue ribbon trout stream like the Yakima it’s likely that every bend has a willing trout. The reason you haven’t met is probably a matter of presentation rather than fly (or lure) choice. They’re in there, just gotta find them and put it in their face! Of course to make it easy book a trip with us, we found them.