When I lived in Washington state I would sometimes explore small streams that were in the mountains, any stream there that had water year round, probably had trout. Only limiting factor was slope steepness, really steep streams with high velocity flow won't support fish, at least the sections on the steep terrain won't. It was fun to bushwhack your way to those small streams, small meaning you could step over them in some places, and catch trout. They weren't big at all, an 8" cutthtroat was a trophy. I'd have a short fly rod, have about 3 feet of line out and just dab a fly in likely looking spots, no casting, it was all about stealth, move up stream, keep a low profile, as long as you don't spook them they would always go for the fly. Most of those little streams were hardly ever fished if at all. It was fun to do every once in a while.
And if I needed a big fish fix, I could go salmon or steelhead fishing. Best of both worlds.