Hi EarthResarcher333.
Re post 3718:
You have a point and I rescind the claim that the concrete “chunk does appear to be from one of those extra thick sections”. I don’t know what part of the spillway it came from.
My point was that most smaller chucks of concrete got washed away, and that one didn’t, plausible due to it’s weight and thickness. It did certainly enter my mind that this thickness could be do to post construction “void filling”.
I do appreciate your input and discussions. Thank you.