I just found this today bc the water level is so low now. The lake was built in 1953. Lots of Indian activity in this area way back when and still living around there today. It would've been about 30' up from the bottom of the valley and about 30' down from the top. I'm assuming that the rock would have been sitting up level at the time. I looked around a little bit but didn't see anymore. Any idea what we found? Is it natural?