You fellas are right about that hole by the road,....there's another deep hole further out that spill wall, and I figured THAT was what the enlarged showed.
Once again,....SMALL beer within the context of the geo-morphology of that "ridge".
Calling that crap, "Bedrock" is a travesty,...
GTC
Kinda doubt that any of what we are seeing under the aux is bedrock - yet. I know that the other end of the dam is very much against solid bedrock. Seen it from the inside. Supposedly, they took core samples on the spillway side, but I have no idea how extensive or complete to information that provided. I don't think I;d want to lay all my hopes on erosion stopping at 30' - but that seems to be the accepted wisdom there.
