Outdoorsman hears vocalizations near Tinkham Campground witnessed in King County, Washington

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I had gone up to Tinkham for a solo camp before spending 5 days in Utah visiting my father. I've given these whistling sounds alot of thought, as two of the three sounded entirely not like any bird I've ever heard - more like a person would whistle, really, only pretty loud, but flat and smooth. The third sounded more like a bird, but the last of its three notes would reverberate all over itself - a piercing note that echoed fairly intensely after termination. (Maybe two weeks earlier, I heard the same sound in the Upper Cle Elum River valley, up on a slope going east away from Tucquala Meadows, coming from several individuals, which I assumed were some kind of bird I'd never heard before. But, then again, I've heard WHOOPING in the same approximate location before, only to write those off, too, as some kind of bird I've never heard before.) The first two, flat-toned, human-like whistles (but with more "air" behind them - far "richer") were to my northeast and east. The northe...