...very tongue in cheek, but it looks like a standard ACoE project on smaller scale; backing up a flowage to create a water empoundment. This is real interesting, Squeeky. You gotta give us some spec's and history. It looks so dang natural, you would never know that it was man-made.
Questions: presuming you own the property on both sides for a way's? Did you carve alot out of the inlet end and all the way to the dam? Where did you get the soil for the dam...all the close stuff? looks like the dam may have been reasonably short because of the narrower scope of the valley...? How big is the watershed? What is your experience at the principal spillway when you get a douser?
(sorry for the multiple ?'s...this stuff gits me)