Whoa...
From your shot there I see that on the right hand third of the emergency spillway the earth overburden that provided downhill ballast to the 30’ tall spillway is scoured away. Additionally the scouring of overtopping water has exposed the sub-grade below the concrete lip to the emergency spillway. This leaves this portion of the spillway with no ballasted backfill opposite water pressure when the lake is full and also leaves the spillway much more subject to abrupt failure when the lake fills.
This condition makes it absolutely imperative that the controlled spillway be used and kept protected because now dumping in advance of coming storms is absolutely critical.
It the emergency spillway comes into play again and the 30’ tall section that is 200’ +/- wide rips out, (1) that is a sudden damaging flood let loose in the river below but also (2) it is a buzz saw of water action tearing into that area of the lake edge perhaps creating a deep failure.
