Couple hear vocalizations while camping at Milk Lake witnessed in Kittitas County, Washington

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We had driven into Milk pond, up Chinook pass, about 30 miles from Yakima, Washington. We were headed to Milk Lake, thats up about 5-7 miles above the pond, we got into the spot late, so we just drove past the pond and found a small area we could part our truck and cabover camper. We ate a quick dinner, and went to bed, we never walked around or made any noise, so I don't think they evey knew we were there. You couldn't see our truck from the pond. In the middle of the night, The frogs from the pond stopped croking, and this loud whistling and clicking noise started, I asked my Husband what it was, and he said he thought it was a Bigfoot. It went on for about 15 min. Then stopped. The next morning I walk all around the pound, hope to see a foot print but didn't. We then went up the hill to the lake. No other people were aound, and while we were fishing we heard the strangest thing, it sounded like someone picked up a 55 gallon metel drum and threw it on the ground, I went in the direct...