Loud low moan then rose quickly to a high pitched scream heard witnessed in Lewis County, Washington

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My cousin and I had been descending the slope until we were about 1/2 mile from the crest where we had camped along a logging road. We decided to sit and rest for a few minutes with our backs to a large fir tree. We were pointed downhill and there was a good breeze blowing the tree tops together. We had been sitting for about five minutes when we heard something behind us and to the right at a good distance away (several hundred yards at least). There were limbs snapping and tree tops knocking together and then something we couldn't recognize. It started as a loud low moan than rose quickly to a high pitched scream that lasted about 15 to 30 seconds in duration. We looked at each other and we were scared and curious. We tried to figure out what it might have been but we figured maybe it was the trees rubbing together or something similar. It certainly didn't sound like any animal we had ever heard or heard of. We remained sitting there for a few more minutes (2 or 3) when we h...