Mike,
Great photos!!!!!!!!!! Thanks.
That's sure the best way to do it.
How high was your dam? With a key way that large, I figure they either do it that large because they can, or because of the size of the dam.
My blade is 12 feet wide on my dozer, so there's no way I was gonna make it that wide. I also don't have a compactor, nor can I afford one, so compaction would be impossible. I'd have to dig my key way 18 feet wide to cover all the ground with my tracks!!!!!!
I bet it was fun watching the experts work.
Eddie