Report 38046: A loud, unknown vocalization startles solo hiker on shore of Goat Lake

Vocalization at close range with no actual sighting. Sunning at end of lake where the trail becomes brushy.  Suddenly without any other sign/signal of someone/something being there, there was a loud vocalization starting with a low pitch howl increasing to high pitch howl almost ending in a high pitch hoop sound. Then dead silence. I jumped up and couldn't see anything but from the lakeshore the trail was pretty obscured and the woods thick. Sound was very close- I estimate 50-75 feet at most.  I grabbed my belongings and got out of there fast hiking all the way back to my truck without stopping except to look back and listen a few times briefly.  Beyond spooky, and puzzling. I have listened to many animal recordings online and nothing native to or not native to WA state sounds even close to this. It does sound strikingly similar to a couple of the recordings I have listened to on the website. I have no doubt I heard something that day that is outside of what species we know to exist in this part of the world. I took me this long because I can't stop thinking of it and when in the woods it has changed the way I view hiking alone, more wary and alert  now, sometimes afraid even.