Possible late night encounter by canoeists on Flat Creek near Piney Creek Wilderness witnessed in Barry County, Missouri

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I'm always doing outdoor activities, floating, camping, hiking and recently I've had some strange encounters. First, I like to go conservation areas frequently, and at wire road conservation area off of Grisham ford rd. In Crane, I was there with a friend it was just after sunset when something would throw very large rocks into the Crane creek. that's all it consisted of is splashing into the creek. It sounds like bowling ball sized rocks being thrown into the water making not only a splash but a 'ker-plunk' noise. This really made me and my friend wonder what was making this noise. We were very open-minded about what could cause this noise and it happened on multiple occasions, all shortly after sunset when no one else was at the conservation area. We told several people about this and of course everyone would say its probably just ducks, but like I said the objects in the water were very large making a 'ker-plunk' noise like a cannon ball. Just as we finally had given up on the sear...