Yeah. As bad as that looks that's not even the worst problem. The hole they are worried about is on the emergency spillway.
This video shows some of the damage at the emergency spillway: http://www.msn.com/en-us/news/other/helicopters-to-drop-in-boulders-to-try-and-stabilize-orville-dam%e2%80%99s-emergency-spillway/vi-AAmTC8U