You can use Google Maps in 3D to get a fairly comprehensive view of the whole layout. The emergency spillway is a fixed configuration. If the level comes up that high, over it goes.
They had their worries about the main spillway, but now I guess it's "screw that, get the level down."
I’ve been catching up. The main spillway had developed a whole in it (from lack of maintenance/inspection).
The contributing failures just keep piling up.