Possible vocalizations heard while visiting McKenzie River Valley witnessed in Lane County, Oregon

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I was out side going to the bathroom by a creek (aprox. 20 feet away) and from across the creek (35 yds away)I here a hooting/ howling from a crop of trees. I immediately go inside. we heard the sound from inside the Yurt (25 feet from creek)2 more times. later that night (30 min) I went outside with a flash light to survey the hill side, when I seen a faint outline of something duck behind a group of trees. I immediately go inside. The next morning I went outside to check things out and there was a footprint leading towards the front door of the yurt. It is a very steep hill leading to the Yurt so the print was only the ball of the foot and the first 3 toes. embedded in the muddy print were several small white/brown hairs that I collected. there was also a hair on the door. My friend and I have been hearing this sound for months but much deeper in the mountains, never this close. My friends dad has been hearing the same sound from deep in the mountains since he moved there in 1984.